- Index
- Preface
- Using Cisco IOS Software
- SIP, SSC, and SPA Product Overview
-
- Overview of the IPsec VPN SPA
- Configuring VPNs in Crypto-Connect Mode
- Configuring VPNs in VRF Mode
- Configuring IPsec VPN Fragmentation and MTU
- Configuring IKE Features Using the IPsec VPN SPA
- Configuring Enhanced IPsec Features Using the IPsec VPN SPA
- Configuring PKI Using the IPsec VPN SPA
- Configuring Advanced VPNs Using the IPsec VPN SPA
- Configuring Duplicate Hardware and IPsec Failover Using the IPsec VPN SPA
- Configuring Monitoring and Accounting for the IPsec VPN SPA
- Troubleshooting the IPsec VPN SPA
- Glossary
- Configuring VPNs in VRF Mode
- VRF Mode Basic Configuration Example
- VRF Mode Remote Access Using Easy VPN Configuration Example
- VRF Mode PE Configuration Example
- VRF Mode CE Configuration Example
- VRF Mode Tunnel Protection Configuration Example
- IP Multicast in VRF Mode Configuration Example
- IPsec Virtual Tunnel Interfaces Configuration Examples
Configuring VPNs in VRF Mode
This chapter provides information about configuring IPsec VPNs in Virtual Routing and Forwarding (VRF) mode, one of the two VPN configuration modes supported by the IPsec VPN SPA. For information on the other VPN mode, crypto-connect mode, see Chapter 21, "Configuring VPNs in Crypto-Connect Mode."
This chapter includes the following topics:
•
Configuring an IPsec Virtual Tunnel Interface
For general information on configuring IPsec VPNs with the IPsec VPN SPA, see the "Overview of Basic IPsec and IKE Configuration Concepts" section on page 20-3.
Note The procedures in this chapter assume you have familiarity with security configuration concepts, such as VLANs, ISAKMP policies, preshared keys, transform sets, access control lists, and crypto maps. For detailed information on configuring these features, refer to the following Cisco IOS documentation:
Cisco IOS Security Configuration Guide, Release 12.2, at this URL:
http://www.cisco.com/en/US/docs/ios/12_2/security/configuration/guide/fsecur_c.html
Cisco IOS Security Command Reference, Release 12.2, at this URL:
http://www.cisco.com/en/US/docs/ios/12_2/security/command/reference/fsecur_r.html
For additional information about the commands used in this chapter, see the Catalyst 6500 Series Cisco IOS Command Reference, Release 12.2SX and the related Cisco IOS Release 12.2 software configuration guide and master index publications. For more information about accessing these publications, see the "Related Documentation" section on page xlv.
Tip To ensure a successful configuration of your VPN using the IPsec VPN SPA, read all of the configuration summaries and guidelines before you perform any configuration tasks.
Configuring VPNs in VRF Mode
VRF mode, also known as VRF-Aware IPsec, allows you to map IPsec tunnels to VPN routing and forwarding instances (VRFs) using a single public-facing address.
A VRF instance is a per-VPN routing information repository that defines the VPN membership of a customer site attached to the Provider Edge (PE) router. A VRF comprises an IP routing table, a derived Cisco Express Forwarding (CEF) table, a set of interfaces that use the forwarding table, and a set of rules and routing protocol parameters that control the information that is included in the routing table. A separate set of routing and CEF tables is maintained for each VPN customer.
Each IPsec tunnel is associated with two VRF domains. The outer encapsulated packet belongs to one VRF domain, called the front door VRF (FVRF), while the inner, protected IP packet belongs to another domain called the inside VRF (IVRF). Stated another way, the local endpoint of the IPsec tunnel belongs to the FVRF while the source and destination addresses of the inside packet belong to the IVRF, the unprotected (LAN) side.
Note Front door VRF (FVRF) is only supported as of Cisco IOS Release 12.2(33)SXH and later.
One or more IPsec tunnels can terminate on a single interface. The FVRF of all these tunnels is the same and is set to the VRF that is configured on that interface. The IVRF of these tunnels can be different and depends on the VRF that is defined in the ISAKMP profile that is attached to a crypto map entry.
With VRF mode, packets belonging to a specific VRF are routed through the IPsec VPN SPA for IPsec processing. Through the CLI, you associate a VRF with an interface VLAN that has been configured to point to the IPsec VPN SPA. An interface VLAN must be created for each VRF. Packets traveling from an MPLS cloud to the Internet that are received from an inside VRF are routed to an interface VLAN, and then to the IPsec VPN SPA for IPsec processing. The IPsec VPN SPA modifies the packets so that they are placed on a special Layer 3 VLAN for routing to the WAN-side port after they leave the IPsec VPN SPA.
Packets traveling in the inbound direction from a protected port on which the crypto engine slot command has been entered are redirected by a special ACL to the IPsec VPN SPA, where they are processed according to the Security Parameter Index (SPI) contained in the packet's IPsec header. Processing on the IPsec VPN SPA ensures that the decapsulated packet is mapped to the appropriate interface VLAN corresponding to the inside VRF. This interface VLAN has been associated with a specific VRF, so packets are routed within the VRF to the correct inside interface.
Note Tunnel protection is supported in VRF mode. For information on configuring tunnel protection, see the "Configuring VPNs in VRF Mode with Tunnel Protection (GRE)" section and the "VRF Mode Tunnel Protection Configuration Example" section.
When configuring a VPN using VRF mode, you have these additional tunneling options: tunnel protection (TP) using GRE, and Virtual Tunnel Interface (VTI). With either of these options, you can terminate tunnels in VRFs (normal VRF mode) or in the global context.
The following subsections describe how to configure a VPN in VRF mode on the IPsec VPN SPA:
•Understanding VPN Configuration in VRF Mode
•VRF Mode Configuration Guidelines and Restrictions
•Configuring VPNs in VRF Mode without Tunnel Protection
•Configuring VPNs in VRF Mode with Tunnel Protection (GRE)
Note For additional information on configuring VPNs in VRF mode, refer to the Cisco IOS documentation at this URL:
http://www.cisco.com/en/US/docs/ios/sec_secure_connectivity/configuration/guide/sec_vrf_aware_ipsec_ps6017_TSD_Products_Configuration_Guide_Chapter.html
Understanding VPN Configuration in VRF Mode
In the traditional crypto-connect mode, a VPN is configured by attaching crypto maps to interface VLANs and then crypto-connecting a physical port to the interface VLAN. When configuring a VPN in VRF mode using the IPsec VPN SPA, the model of interface VLANs is preserved, but the crypto connect vlan CLI command is not used. When a packet comes into an interface on a specific VRF, the packet must get to the proper interface VLAN. A route must be installed so that packets destined for that particular subnet in that particular VRF are directed to that interface VLAN. This function can be achieved through the following configuration options:
•Configuring an IP address on the interface VLAN that is in the same subnet as the packets' destination IP address. For example, packets are trying to reach subnet 10.1.1.x and their destination IP address is 10.1.1.1 as follows:
int vlan 100
ip vrf forwarding coke
ip address 10.1.1.254 255.255.255.0 <-- same subnet as 10.1.1.x that we are trying to reach.
crypto map mymap
crypto engine slot 4/1
•Configuring a static route as follows:
ip route vrf coke 10.1.1.0 255.255.255.0 vlan 100
•Configuring routing protocols. You configure BGP, OSPF, or other routing protocols so that remote switches broadcast their routes.
Note Do not configure routing protocols unless you are using tunnel protection.
•Configuring Reverse Route Injection (RRI). You configure RRI so that a route gets installed when the remote end initiates an IPsec session (as in remote access situations).
With VRF mode, the switch sees the interface VLAN as a point-to-point connection; the packets are placed directly onto the interface VLAN. Each VRF has its own interface VLAN.
When a crypto map is attached to an interface VLAN and the ip vrf forwarding command has associated that VLAN with a particular VRF, the software creates a point-to-point connection so that all routes pointing to the interface VLAN do not attempt to run the Address Resolution Protocol (ARP). Through normal routing within the VRF, packets to be processed by the IPsec VPN SPA are sent to the interface VLAN. You may configure features on the interface VLAN. The IP address of the interface VLAN must be on the same subnet as the desired destination subnet for packets to be properly routed.
When you enter the ip vrf forwarding command on an inside interface, all packets coming in on that interface are routed correctly within that VRF.
When you enable the crypto engine mode vrf command and enter the crypto engine slot outside command on an interface, a special ACL is installed that forces all incoming Encapsulating Security Payload (ESP)/Authentication Header (AH) IPsec packets addressed to a system IP address to be sent to the IPsec VPN SPA WAN-side port. NAT Traversal (NAT-T) packets are also directed to the IPsec VPN SPA by the special ACL.
Note You must enter the vrf vrf_name command from within the context of an ISAKMP profile. This command does not apply to the VRF-aware crypto infrastructure; it applies only to generic crypto processing. When the ISAKMP profile is added to a crypto map set, the VRF becomes the default VRF for all of the crypto maps in the list. Individual crypto maps may override this default VRF by specifying another policy profile that contains a different VRF. If no profile is applied to a crypto map tag, it inherits the VRF from the interface if you have configured the interface with the ip vrf forwarding command.
All packets destined for a protected outside interface received in this VRF context are placed on the associated interface VLAN. Similarly, all decapsulated ingress packets associated with this VRF are placed on the appropriate interface VLAN so that they may be routed in the proper VRF context.
VRF Mode Configuration Guidelines and Restrictions
Follow these guidelines and restrictions when configuring a VPN for the IPsec VPN SPA using VRF mode:
Note After enabling or disabling VRF mode using the [no] crypto engine mode vrf command, you must reload the supervisor engine. In addition, MPLS tunnel recirculation must be enabled for VRF mode. That is, you must add the mls mpls tunnel-recir command before entering the crypto engine mode vrf command.
•The procedure for configuring a VPN in VRF mode varies based on whether you are using tunnel protection or not.
•Unlike IPsec VPN SPA crypto-connect mode configurations, when configuring VPNs in VRF mode, you do not use the crypto connect vlan command.
•In Cisco IOS Release 12.2(33)SXH and later releases, the crypto engine subslot command used in previous releases has been replaced with the crypto engine slot command (of the form crypto engine slot slot/subslot {inside | outside}). The crypto engine subslot command is no longer supported. In Cisco IOS Release 12.2(33)SXI and later releases, it is not necessary to specify the slot slot/subslot information with the outside keyword. When upgrading, ensure that the crypto engine command has been modified in your start-up configuration to avoid extended maintenance time.
•As of Cisco IOS Release 12.2(33)SXH, the ip vrf forwarding command is no longer required when configuring GRE with tunnel protection.
•Crypto ACLs support only the EQ operator. Other operators, such as GT, LT, and NEQ, are not supported.
Note When configuring a permit policy for multiple ports with the EQ operator, you must use multiple lines as in this example:
permit ip any any port eq 300 permit ip any any port eq 400 permit ip any any port eq 600
In Cisco IOS Release 12.2(33)SXH1 and later releases, when configuring a deny policy for multiple ports with the EQ operator, you can use commas to declare the ports as in this example:
deny ip any any port eq 300,400,600
•Noncontiguous subnets in a crypto ACL, as in the following example, are not supported:
deny ip 10.0.5.0 0.255.0.255 10.0.175.0 0.255.0.255
deny ip 10.0.5.0 0.255.0.255 10.0.176.0 0.255.0.255
•ACL counters are not supported for crypto ACLs.
•An egress ACL is not applied to packets generated by the route processor. An ingress ACL is not applied to packets destined for the route processor.
•When you create an ISAKMP profile, note the following guidelines regarding the use of the vrf command:
–You must use the vrf command if you are using the ISAKMP profile with a crypto map.
–You are not required to use the vrf command if you are using the ISAKMP profile with tunnel protection.
–You should not use the vrf command if you are using the ISAKMP profile with DMVPN.
•When the ip vrf forwarding command is applied to a VLAN, any previously existing IP address assigned to that VLAN is removed. To assign an IP address to the VLAN, enter the ip address command after the ip vrf forwarding command, not preceding it.
•Although more than one IPsec VPN SPA in a chassis is supported beginning with Cisco IOS Release 12.2(18) SXE, in VRF mode, there is no configuration difference between multiple IPsec VPN SPA operation and single IPsec VPN SPA operation. For multiple IPsec VPN SPA operation, the only change is to the output of the show crypto vlan command. The following is an example:
Interface Tu1 on IPSec Service Module port Gi7/1/1 connected to VRF vrf1 Interface VLAN 2 on IPSec Service Module port Gi7/1/1 connected to VRF vrf2
•Applying an ACL to the ingress interface will interfere with the packet flow in releases earlier than Cisco IOS Release 12.2(33) SXI. .
Note Do not apply an ACL during the configuration of VRF mode in releases earlier than Cisco IOS Release 12.2(33) SXI.
•The number of outside interfaces supported by the IPsec VPN SPA is determined by your system resources.
•Inbound and outbound traffic for the same tunnel must use the same outside interface. Asymmetric routing, in which encrypted traffic uses a different outside interface than decrypted traffic for the same tunnel, is not supported.
•A loopback interface can be used as tunnel source address.
•A crypto map local address (for example, the interface VLAN address if the crypto map is applied to the interface VLAN) can share the same address as the TP tunnel source address, but it cannot share the same address as a DMVPN tunnel source address.
•In VRF mode, crypto map interfaces that share the same local address must be bound to the same crypto engine.
•When two tunnels share the same tunnel source address, they will be taken over by the IPsec VPN SPA only if one of the following two conditions are met:
–Both tunnels share the same FVRF.
–The crypto engine gre vpnblade command is entered.
•You can configure the FVRF to be the same as the IVRF.
•In VRF mode, ingress ACLs are installed on crypto engine outside interfaces. In combination with other configured ACLs, these ACLs may cause the ACL-TCAM usage to become excessive. To reduce the TCAM usage, share the TCAM resources by entering the mls acl tcam share-global command in the configuration. You can view the ACL usage using the show tcam counts command.
•In Cisco IOS Release 12.2(33)SXF and earlier releases, IPsec can be configured with manual keying instead of IKE. If you configure manual keying, you must configure SPI to be greater than 4096.
Supported and Unsupported Features in VRF Mode
A list of the supported and unsupported features in VRF mode can be found in the "IPsec Feature Support" section on page 20-6. Additional details are as follows:
•Remote access into a VRF (provider edge [PE]) is supported with the following:
–Reverse Route Injection (RRI) only with crypto maps
–Proxy AAA (one VRF is proxied to a dedicated AAA)
•Customer edge-provider edge (CE-PE) encryption using tunnel protection is supported with the following:
–Routing update propagation between CEs
–IGP/eBGP routing update propagation between the PE and CEs
Configuring VPNs in VRF Mode without Tunnel Protection
To configure a VPN in VRF mode with crypto maps and without tunnel protection, perform this task beginning in global configuration mode:
|
|
|
|
|---|---|---|
Step 1 |
Router(config)# mls mpls tunnel-recir |
Enables tunnel-MPLS recirculation. |
Step 2 |
Router(config)# crypto engine mode vrf |
Enables VRF mode for the IPsec VPN SPA. Note |
Step 3 |
Router(config)# ip vrf vrf-name |
Configures a VRF routing table and enters VRF configuration mode. • |
Step 4 |
Router(config-vrf)# rd route-distinguisher |
Creates routing and forwarding tables for a VRF. • |
Step 5 |
Router(config-vrf)# route-target export route-target-ext-community |
Creates lists of export route-target extended communities for the specified VRF. • |
Step 6 |
Router(config-vrf)# route-target import route-target-ext-community |
Creates lists of import route-target extended communities for the specified VRF. • |
Step 7 |
Router(config-vrf)# exit |
Exits VRF configuration mode. |
Step 8 |
Router(config)# crypto keyring keyring-name [vrf fvrf-name] |
Defines a crypto keyring to be used during IKE authentication and enters keyring configuration mode. • • |
Step 9 |
Router(config-keyring)# pre-shared-key {address address [mask] | hostname hostname} key key |
Defines a preshared key to be used for IKE authentication. • • • |
Step 10 |
Router(config-keyring)# exit |
Exits keyring configuration mode. |
Step 11 |
Router(config)# crypto ipsec transform-set transform-set-name transform1[transform2[transform3]] |
Defines a transform set (an acceptable combination of security protocols and algorithms) and enters crypto transform configuration mode. • • |
Step 12 |
Router(config-crypto-trans)# exit |
Exits crypto transform configuration mode |
Step 13 |
Router(config)# crypto isakmp policy priority |
Defines an IKE policy and enters ISAKMP policy configuration mode. • |
Step 14 |
Router(config-isakmp)# authentication pre-share |
Specifies the authentication method with an IKE policy. • |
Step 15 |
Router(config-isakmp)# lifetime seconds |
Specifies the lifetime of an IKE SA. • |
Step 16 |
Router(config-isakmp)# exit |
Exits ISAKMP policy configuration mode. |
Step 17 |
Router(config)# crypto isakmp profile profile-name |
Defines an ISAKMP profile and enters ISAKMP profile configuration mode. • |
Step 18 |
Router(config-isa-prof)# vrf ivrf |
Defines the VRF to which the IPsec tunnel will be mapped. • |
Step 19 |
Router(config-isa-prof)# keyring keyring-name |
Configures a keyring within an ISAKMP profile. • |
Step 20 |
Router(config-isa-prof)# match identity address address [mask] [vrf] |
Matches an identity from a peer in an ISAKMP profile. • • |
Step 21 |
Router(config-isa-prof)# exit |
Exits ISAKMP profile configuration mode. |
Step 22 |
Router(config)# access list access-list-number {deny | permit} ip host source host destination |
Defines an extended IP access list. • • • • |
Step 23 |
Router(config)# crypto map map-name seq-number ipsec-isakmp |
Creates or modifies a crypto map entry and enters the crypto map configuration mode. • • • |
Step 24 |
Router(config-crypto-map)# set peer {hostname | ip-address} |
Specifies an IPsec peer in a crypto map entry. • |
Step 25 |
Router(config-crypto-map)# set transform-set transform-set-name |
Specifies which transform sets can be used with the crypto map entry. • |
Step 26 |
Router(config-crypto-map)# set isakmp-profile profile-name |
Sets the ISAKMP profile name. • |
Step 27 |
Router(config-crypto-map)# match address [access-list-id | name] |
Specifies an extended access list for the crypto map entry. • • |
Step 28 |
Router(config-crypto-map)# exit |
Exits crypto map configuration mode. |
Step 29 |
Router(config)# crypto map map-name local-address interface-id |
Specifies and names an identifying interface to be used by the crypto map for IPsec traffic. • • Note Note |
Step 30 |
Router(config)# interface fastethernet slot/port |
Configures a Fast Ethernet interface and enters interface configuration mode. |
Step 31 |
Router(config-if)# ip vrf forwarding vrf-name |
Associates a VRF with an interface or subinterface. • |
Step 32 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for the interface. • • |
Step 33 |
Router(config-if)# no shutdown |
Enables the interface. |
Step 34 |
Router(config-if)# interface gigabitethernet slot/subslot/port |
Configures a Gigabit Ethernet interface. Match the value specified as the interface-id in Step 29. |
Step 35 |
Router(config-if)# ip vrf forwarding vrf-name |
(Optional) Associates a VRF with an interface or subinterface. · vrf-name—Name assigned to the VRF. |
Step 36 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for an interface. • • |
Step 37 |
Router(config-if)# crypto engine slot slot/subslot outside |
Assigns the specified crypto engine to the interface. • Note |
Step 38 |
Router(config-if)# no shutdown |
Enables the interface. |
Step 39 |
Router(config-if)# exit |
Exits interface configuration mode. |
Step 40 |
Router(config)# interface vlan-id |
Configures a VLAN interface and enters interface configuration mode. • |
Step 41 |
Router(config-if)# ip vrf forwarding vrf-name |
Associates a VRF with an interface or subinterface. • |
Step 42 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for the interface. • • |
Step 43 |
Router(config-if)# crypto map map-name |
Applies a previously defined crypto map set to an interface. • |
Step 44 |
Router(config-if)# crypto engine slot slot/subslot inside |
Assigns the specified crypto engine to the interface. • |
Step 45 |
Router(config-if)# exit |
Exits interface configuration mode. |
Step 46 |
Router(config)# ip route vrf vrf-name prefix mask interface-number |
Establishes static routes for a VRF. • • • • |
Step 47 |
Router(config)# end |
Returns to privileged EXEC mode. |
For complete configuration information for VRF-Aware IPsec, refer to this URL:
For a configuration example, see the "VRF Mode Basic Configuration Example" section.
Configuring VPNs in VRF Mode with Tunnel Protection (GRE)
This section describes how to configure a VPN in VRF mode with tunnel protection (TP). Tunnel protection is GRE tunneling in VRF mode.
When you configure IPsec, a crypto map is attached to an interface to enable IPsec. With tunnel protection, there is no need for a crypto map or ACL to be attached to the interface. A crypto policy is attached directly to the tunnel interface. Any traffic routed by the interface is encapsulated in GRE and then encrypted using IPsec. The tunnel protection feature can be applied to point-to-point GRE.
VRF Mode Using Tunnel Protection Configuration Guidelines and Restrictions
When configuring tunnel protection on the IPsec VPN SPA, follow these guidelines and restrictions:
•Do not configure any options (such as sequence numbers or tunnel keys) that prevent the IPsec VPN SPA from seizing the GRE tunnel.
•Do not configure the GRE tunnel keepalive feature.
•When applied to the GRE tunnel interface, the ip tcp adjust-mss command is ignored. Apply the command to the ingress LAN interface instead. (CSCsl27876)
•Do not use crypto maps to protect GRE traffic in VRF mode.
•When a crypto map interface and a tunnel protection interface (either VTI or GRE/TP) share the same outside interface, they cannot share the same local source address.
•To avoid fragmentation after encryption, set the tunnel IP MTU to be equal to or less than the egress interface MTU minus the GRE and IPsec overheads. The egress interface MTU must be the smallest MTU of all the active crypto outside interfaces.
To configure a VPN in VRF mode using tunnel protection, perform this task beginning in global configuration mode:
|
|
|
|
|---|---|---|
Step 1 |
Router(config)# mls mpls tunnel-recir |
Enables tunnel-MPLS recirculation. |
Step 2 |
Router(config)# crypto engine mode vrf |
Enables VRF mode for the IPsec VPN SPA. Note |
Step 3 |
Router(config)# ip vrf vrf-name |
Configures a VRF routing table and enters VRF configuration mode. • |
Step 4 |
Router(config-vrf)# rd route-distinguisher |
Creates routing and forwarding tables for a VRF. • |
Step 5 |
Router(config-vrf)# route-target export route-target-ext-community |
Creates lists of export route-target extended communities for the specified VRF. • |
Step 6 |
Router(config-vrf)# route-target import route-target-ext-community |
Creates lists of import route-target extended communities for the specified VRF. • |
Step 7 |
Router(config-vrf)# exit |
Exits VRF configuration mode. |
Step 8 |
Router(config)# crypto keyring keyring-name [vrf fvrf-name] |
Defines a crypto keyring to be used during IKE authentication and enters keyring configuration mode. • • |
Step 9 |
Router(config-keyring)# pre-shared-key {address address [mask] | hostname hostname} key key |
Defines a preshared key to be used for IKE authentication. • • • |
Step 10 |
Router(config-keyring)# exit |
Exits keyring configuration mode. |
Step 11 |
Router(config)# crypto ipsec transform-set transform-set-name transform1[transform2[transform3]] |
Defines a transform set (an acceptable combination of security protocols and algorithms) and enters crypto transform configuration mode. • • |
Step 12 |
Router(config-crypto-trans)# exit |
Exits crypto transform configuration mode |
Step 13 |
Router(config)# crypto isakmp policy priority |
Defines an IKE policy and enters ISAKMP policy configuration mode. • |
Step 14 |
Router(config-isakmp)# authentication pre-share |
Specifies the authentication method with an IKE policy. • |
Step 15 |
Router(config-isakmp)# lifetime seconds |
Specifies the lifetime of an IKE SA. • |
Step 16 |
Router(config-isakmp)# exit |
Exits ISAKMP policy configuration mode. |
Step 17 |
Router(config)# crypto isakmp profile profile-name |
Defines an ISAKMP profile and enters ISAKMP profile configuration mode • |
Step 18 |
Router(config-isa-prof)# keyring keyring-name |
Configures a keyring within an ISAKMP profile. • |
Step 19 |
Router(config-isa-prof)# match identity address address [mask] |
Matches an identity from a peer in an ISAKMP profile. • |
Step 20 |
Router(config-isa-prof)# exit |
Exits ISAKMP profile configuration mode. |
Step 21 |
Router(config)# access list access-list-number {deny | permit} ip host source host destination |
Defines an extended IP access list. • • • • |
Step 22 |
Router(config)# crypto ipsec profile profile-name |
Defines an IPsec profile and enters IPsec profile configuration mode. • |
Step 23 |
Router(config-ipsec-profile)# set transform-set transform-set-name |
Specifies which transform sets can be used with the crypto map entry. • |
Step 24 |
Router(config-ipsec-profile)# set isakmp-profile profile-name |
Sets the ISAKMP profile name. • |
Step 25 |
Router(config-ipsec-profile)# exit |
Exits IPsec profile configuration mode. |
Step 26 |
Router(config)# interface tunnel-number |
Configures a tunnel interface and enters interface configuration mode. • |
Step 27 |
Router(config-if)# ip vrf forwarding vrf-name |
(Optional) Associates a VRF with an interface or subinterface. • |
Step 28 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for the interface. • • |
Step 29 |
Router(config-if)# tunnel source ip-address |
Sets the source address of a tunnel interface. • |
Step 30 |
Router(config-if)# tunnel vrf vrf-name |
(Optional) Associates a VPN routing and forwarding instance (VRF) with a specific tunnel destination, interface or subinterface. This step is only required when configuring a front door VRF (FVRF). • |
Step 31 |
Router(config-if)# tunnel destination ip-address |
Sets the destination address of a tunnel interface. • |
Step 32 |
Router(config-if)# tunnel protection ipsec crypto-policy-name |
Associates a tunnel interface with an IPsec profile. • |
Step 33 |
Router(config-if)# crypto engine slot slot/subslot inside |
Assigns the specified crypto engine to the interface. • |
Step 34 |
Router(config-if)# interface fastethernet slot/subslot |
Configures a Fast Ethernet interface. |
Step 35 |
Router(config-if)# ip vrf forwarding vrf-name |
(Optional) Associates a VRF with an interface or subinterface. • |
Step 36 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for an interface. • • |
Step 37 |
Router(config-if)# no shutdown |
Enables the interface. |
Step 38 |
Router(config-if)# interface type slot/subslot/port |
Configures the physical egress interface. |
Step 39 |
Router(config-if)# ip vrf forwarding vrf-name |
(Optional) Associates a VRF with an interface or subinterface. • |
Step 40 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for an interface. • • |
Step 41 |
Router(config-if)# crypto engine slot slot/subslot outside |
Assigns the crypto engine to the interface. • Note |
Step 42 |
Router(config-if)# no shutdown |
Enables the interface. |
Step 43 |
Router(config-if)# exit |
Exits interface configuration mode. |
For a configuration example, see the "VRF Mode Tunnel Protection Configuration Example" section.
Configuring an IPsec Virtual Tunnel Interface
The IPsec Virtual Tunnel Interface (VTI) provides a routable interface type for terminating IPsec tunnels that greatly simplifies the configuration process when you need to provide protection for remote access, and provides a simpler alternative to using GRE tunnels and crypto maps with IPsec. In addition, the IPsec VTI simplifies network management and load balancing.
Note IPsec VTI is supported in Cisco IOS Release 12.2(33)SXH and later releases, and is not supported in crypto-connect mode.
Note the following details about IPsec VTI routing and traffic encryption:
•You can enable routing protocols on the tunnel interface so that routing information can be propagated over the virtual tunnel. The router can establish neighbor relationships over the virtual tunnel interface. Interoperability with standard-based IPsec installations is possible through the use of the IP ANY ANY proxy. The static IPsec interface will negotiate and accept IP ANY ANY proxies.
•The IPsec VTI supports native IPsec tunneling and exhibits most of the properties of a physical interface.
•In the IPsec VTI, encryption occurs in the tunnel. Traffic is encrypted when it is forwarded to the tunnel interface. Traffic forwarding is handled by the IP routing table, and dynamic or static IP routing can be used to route the traffic to the virtual tunnel interface. Using IP routing to forward the traffic to encryption simplifies the IPsec VPN configuration because the use of ACLs with a crypto map in native IPsec configurations is not required. When IPsec VTIs are used, you can separate applications of NAT, ACLs, and QoS, and apply them to clear text or encrypted text, or both. When crypto maps are used, there is no easy way to specify forced encryption features.
IPsec Virtual Tunnel Interface Configuration Guidelines and Restrictions
When configuring IPsec VTI, follow these guidelines and restrictions:
•A VTI tunnel can terminate either in a VRF (normal VRF mode) or in the global context (with no ip vrf forwarding command on the tunnel interface).
•Only static VTI is supported.
•Only strict IP ANY ANY proxy is supported.
•The IPsec transform set must be configured only in tunnel mode.
•The IKE security association (SA) is bound to the virtual tunnel interface. Because it is bound to the virtual tunnel interface, the same IKE SA cannot be used for a crypto map.
•When the mls mpls tunnel-recir command is applied in a VTI configuration, one reserved VLAN is allocated to each tunnel. As a result, there will be a maximum limit of 1000 VTI tunnels.
•In releases earlier than Cisco IOS Release 12.2(33)SXI, the following guidelines apply:
–The IPsec virtual tunnel interface is limited to IP unicast, as opposed to GRE tunnels, which have a wider application for IPsec implementation.
–Multicast over VTI is not supported except for control plane traffic such as routing protocol updates.
•In Cisco IOS Release 12.2(33)SXI and later releases, the following guidelines apply:
–A static VTI tunnel interface supports multicast traffic.
–ACLs can be applied to GRE and static VTI tunnel interfaces participating in multicast traffic.
–Platform QoS features can be applied to GRE and static VTI tunnel interfaces participating in multicast traffic.
Configuring an IPsec Static Tunnel
To configure a static IPsec virtual tunnel interface, perform this task beginning in global configuration mode:
|
|
|
|
|---|---|---|
Step 1 |
Router(config)# mls mpls tunnel-recir |
Enables tunnel-MPLS recirculation. |
Step 2 |
Router(config)# crypto engine mode vrf |
Enables VRF mode for the IPsec VPN SPA. Note |
Step 3 |
Router(config)# ip vrf vrf-name |
Configures a VRF routing table and enters VRF configuration mode. • |
Step 4 |
Router(config-vrf)# rd route-distinguisher |
Creates routing and forwarding tables for a VRF. • |
Step 5 |
Router(config-vrf)# route-target export route-target-ext-community |
Creates lists of export route-target extended communities for the specified VRF. • |
Step 6 |
Router(config-vrf)# route-target import route-target-ext-community |
Creates lists of import route-target extended communities for the specified VRF. • |
Step 7 |
Router(config-vrf)# exit |
Exits VRF configuration mode. |
Step 8 |
Router(config)# crypto keyring keyring-name [vrf fvrf-name] |
Defines a crypto keyring to be used during IKE authentication and enters keyring configuration mode. • • |
Step 9 |
Router(config-keyring)# pre-shared-key {address address [mask] | hostname hostname} key key |
Defines a preshared key to be used for IKE authentication. • • • |
Step 10 |
Router(config-keyring)# exit |
Exits keyring configuration mode. |
Step 11 |
Router(config)# crypto ipsec transform-set transform-set-name transform1[transform2[transform3]] |
Defines a transform set (an acceptable combination of security protocols and algorithms) and enters crypto transform configuration mode. • • |
Step 12 |
Router(config-crypto-trans)# exit |
Exits crypto transform configuration mode |
Step 13 |
Router(config)# crypto isakmp policy priority |
Defines an IKE policy and enters ISAKMP policy configuration mode. • |
Step 14 |
Router(config-isakmp)# authentication pre-share |
Specifies the authentication method with an IKE policy. • |
Step 15 |
Router(config-isakmp)# lifetime seconds |
Specifies the lifetime of an IKE SA. • |
Step 16 |
Router(config-isakmp)# exit |
Exits ISAKMP policy configuration mode. |
Step 17 |
Router(config)# crypto ipsec profile profile-name |
Defines an IPsec profile and enters IPsec profile configuration mode. The IPsec profile defines the IP Security (IPsec) parameters that are to be used for IPsec encryption between two IPsec routers. • |
Step 18 |
Router(config-ipsec-profile)# set transform-set transform-set-name [transform-set-name2 ...transform-set-name6] |
Specifies which transform sets can be used with the crypto map entry. • |
Step 19 |
Router(config)# interface type slot/[subslot]/port |
Configures an interface type. • • |
Step 20 |
Router(config-if)# ip vrf forwarding vrf-name |
(Optional) Associates a VRF with an interface or subinterface. • |
Step 21 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for an interface. • • |
Step 22 |
Router(config-if)# tunnel mode ipsec ipv4 |
Defines the mode for the tunnel as IPsec and the transport as IPv4. |
Step 23 |
Router(config-if)# tunnel source ip-address |
Sets the source address of a tunnel interface. • |
Step 24 |
Router(config-if)# tunnel destination ip-address |
Sets the destination address of a tunnel interface. • |
Step 25 |
Router(config-if)# tunnel vrf vrf-name |
(Optional) Associates a VPN routing and forwarding instance (VRF) with a specific tunnel destination. This step is only required when configuring a front door VRF (FVRF). • |
Step 26 |
Router(config-if)# tunnel protection ipsec profile name |
Associates a tunnel interface with an IPsec profile. • |
Step 27 |
Router(config-if)# crypto engine slot slot/subslot inside |
Assigns the specified crypto engine to the interface. • |
Step 28 |
Router(config-if)# interface type slot/subslot/port |
Configures the physical egress interface. |
Step 29 |
Router(config-if)# ip vrf forwarding vrf-name |
(Optional) Associates a VRF with an interface or subinterface. • |
Step 30 |
Router(config-if)# ip address address mask |
Sets a primary or secondary IP address for an interface. • • |
Step 31 |
Router(config-if)# crypto engine outside |
Assigns the crypto engine to the interface. |
Step 32 |
Router(config-if)# no shutdown |
Enables the interface. |
Step 33 |
Router(config-if)# exit |
Exits interface configuration mode. |
Verifying the IPsec Virtual Tunnel Interface Configuration
To confirm that your IPsec virtual tunnel interface configuration is working properly, enter the show interfaces tunnel, show crypto session, and show ip route commands.
The show interfaces tunnel command displays tunnel interface information, the show crypto session command displays status information for active crypto sessions, and the show ip route command displays the current state of the routing table.
In this display the Tunnel 0 is up and the line protocol is up. If the line protocol is down, the session is not active.
Router1# show interfaces tunnel 0
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Internet address is 10.0.51.203/24
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 103/255, rxload 110/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source 10.0.149.203, destination 10.0.149.217
Tunnel protocol/transport IPSEC/IP, key disabled, sequencing disabled
Tunnel TTL 255
Checksumming of packets disabled, fast tunneling enabled
Tunnel transmit bandwidth 8000 (kbps)
Tunnel receive bandwidth 8000 (kbps)
Tunnel protection via IPSec (profile "P1")
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
30 second input rate 13000 bits/sec, 34 packets/sec
30 second output rate 36000 bits/sec, 34 packets/sec
191320 packets input, 30129126 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
59968 packets output, 15369696 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Router1# show crypto session
Crypto session current status
Interface: Tunnel0
Session status: UP-ACTIVE
Peer: 10.0.149.217 port 500
IKE SA: local 10.0.149.203/500 remote 10.0.149.217/500 Active
IPSEC FLOW: permit ip 0.0.0.0/0.0.0.0 0.0.0.0/0.0.0.0
Active SAs: 4, origin: crypto map
Router1# show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C 10.0.35.0/24 is directly connected, Ethernet3/3
S 10.0.36.0/24 is directly connected, Tunnel0
C 10.0.51.0/24 is directly connected, Tunnel0
C 10.0.149.0/24 is directly connected, Ethernet3/0
For more complete information about IPsec Virtual Tunnel Interface, refer to the following URL:
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t14/feature/guide/gtIPSctm.html
For IPsec Virtual Tunnel Interface configuration examples, see the "IPsec Virtual Tunnel Interfaces Configuration Examples" section.
Configuring VTI in the Global Context
With Cisco IOS Release 12.2(33)SXH and later releases, you can configure IPsec VTI without having to configure VRFs. Although VRF mode must be configured globally using the crypto engine mode vrf command, tunnels can be terminated in the global context rather than in VRFs.
The configuration steps for VTI in the global context are similar to the steps for IPsec VTI shown in the "Configuring an IPsec Static Tunnel" section with the exception that the ip vrf forwarding vrf-name command and the tunnel vrf vrf-name command are not required.
For a configuration example of IPsec VTI in the global context, see the "IPsec Virtual Tunnel Interfaces Configuration Examples" section.
Configuration Examples
The following sections provide examples of VRF mode configurations:
•VRF Mode Basic Configuration Example
•VRF Mode Remote Access Using Easy VPN Configuration Example
•VRF Mode PE Configuration Example
•VRF Mode CE Configuration Example
•VRF Mode Tunnel Protection Configuration Example
•IP Multicast in VRF Mode Configuration Example
•IPsec Virtual Tunnel Interfaces Configuration Examples
Note When the ip vrf forwarding command is applied to a VLAN, any previously existing IP address assigned to that VLAN is removed. To assign an IP address to the VLAN, enter the ip address command after the ip vrf forwarding command, not preceding it.
Note The following examples use commands at the level of Cisco IOS Release 12.2(33)SXH.
In Cisco IOS Release 12.2(33)SXH and later releases, the crypto engine subslot command used in previous releases has been replaced with the crypto engine slot command (of the form crypto engine slot slot/subslot {inside | outside}). The crypto engine subslot command is no longer supported. In Cisco IOS Release 12.2(33)SXI and later releases, do not specify the slot slot/subslot information with the outside keyword. When upgrading, ensure that this command has been modified in your start-up configuration to avoid extended maintenance time.
VRF Mode Basic Configuration Example
The following example shows a basic IPsec VPN SPA configuration using VRF mode:
Switch 1 Configuration
hostname router-1
!
ip vrf ivrf
rd 1000:1
route-target export 1000:1
route-target import 1000:1
!
crypto engine mode vrf
!
vlan 2,3
!
crypto keyring key0
pre-shared-key address 11.0.0.2 key 12345
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
!
crypto isakmp profile prof1
vrf ivrf
keyring key0
match identity address 11.0.0.2 255.255.255.255
!
!
crypto ipsec transform-set proposal1 esp-3des esp-sha-hmac
!
crypto map testtag local-address Vlan3
crypto map testtag 10 ipsec-isakmp
set peer 11.0.0.2
set transform-set proposal1
set isakmp-profile prof1
match address 101
!
interface GigabitEthernet1/1
!switch inside port
ip vrf forwarding ivrf
ip address 12.0.0.1 255.255.255.0
!
!
interface GigabitEthernet1/2
!switch outside port
switchport
switchport access vlan 3
switchport mode access
!
interface GigabitEthernet4/0/1
!IPsec VPN SPA inside port
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet4/0/2
!IPsec VPN SPA outside port
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface Vlan2
ip vrf forwarding ivrf
ip address 13.0.0.252 255.255.255.0
crypto map testtag
crypto engine slot 4/0 inside
!
interface Vlan3
ip address 11.0.0.1 255.255.255.0
crypto engine slot 4/0 outside
!
access-list 101 permit ip host 12.0.0.2 host 13.0.0.2
Switch 2 Configuration
hostname router-2
!
ip vrf ivrf
rd 1000:1
route-target export 1000:1
route-target import 1000:1
!
crypto engine mode vrf
!
vlan 2,3
!
crypto keyring key0
pre-shared-key address 11.0.0.1 key 12345
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
!
crypto isakmp profile prof1
vrf ivrf
keyring key0
match identity address 11.0.0.1 255.255.255.255
!
!
crypto ipsec transform-set proposal1 esp-3des esp-sha-hmac
!
crypto map testtag local-address Vlan3
crypto map testtag 10 ipsec-isakmp
set peer 11.0.0.1
set transform-set proposal1
set isakmp-profile prof1
match address 101
!
interface GigabitEthernet1/1
!switch inside port
ip vrf forwarding ivrf
ip address 13.0.0.1 255.255.255.0
!
interface GigabitEthernet1/2
!switch outside port
switchport
switchport access vlan 3
switchport mode access
!
interface GigabitEthernet4/0/1
!IPsec VPN SPA inside port
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet4/0/2
!IPsec VPN SPA outside port
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface Vlan2
ip vrf forwarding ivrf
ip address 12.0.0.252 255.255.255.0
crypto map testtag
crypto engine slot 4/0 inside
!
interface Vlan3
ip address 11.0.0.2 255.255.255.0
crypto engine slot 4/0 outside
!
access-list 101 permit ip host 13.0.0.2 host 12.0.0.2
VRF Mode Remote Access Using Easy VPN Configuration Example
The following examples show VRF mode configurations for remote access using Easy VPN, first using RADIUS authentication, then using local authentication:
Using RADIUS Authentication
aaa group server radius acs-vrf1
server-private 192.1.1.251 auth-port 1812 acct-port 1813 key allegro
ip vrf forwarding vrf1
!
aaa authentication login test_list group acs-vrf1
aaa authorization network test_list group acs-vrf1
aaa accounting network test_list start-stop group acs-vrf1
!
ip vrf ivrf
rd 1:1
route-target export 1:1
route-target import 1:1
!
!
crypto isakmp policy 5
encr 3des
authentication pre-share
group 2
crypto isakmp client configuration group test
key world
pool pool1
!
crypto isakmp profile test_pro
vrf ivrf
match identity group test
client authentication list test_list
isakmp authorization list test_list
client configuration address respond
accounting test_list
crypto ipsec transform-set t3 esp-3des esp-sha-hmac
!
crypto dynamic-map remote 1
set transform-set t3
set isakmp-profile test_pro
reverse-route
!
!
crypto map map-ra local-address GigabitEthernet2/1
crypto map map-ra 10 ipsec-isakmp dynamic remote
!
interface GigabitEthernet2/1
mtu 9216
ip address 120.0.0.254 255.255.255.0
ip flow ingress
logging event link-status
mls qos trust ip-precedence
crypto engine slot 1/0 outside
!
interface GigabitEthernet1/0/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,100,1002-1005
switchport mode trunk
mtu 9216
mls qos trust ip-precedence
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet1/0/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
mls qos trust ip-precedence
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface Vlan100
ip vrf forwarding vrf1
ip address 120.0.0.100 255.255.255.0
no mop enabled
crypto map map-ra
crypto engine slot 1/0 inside
ip local pool pool1 100.0.1.1 100.0.5.250
Using Local Authentication
username t1 password 0 cisco
aaa new-model
!
aaa authentication login test_list local
aaa authorization network test_list local
!
aaa session-id common
!
ip vrf ivrf
rd 1:2
route-target export 1:2
route-target import 1:2
!
crypto isakmp policy 5
encr 3des
authentication pre-share
group 2
!
crypto isakmp client configuration group test
key world
pool pool1
crypto isakmp profile test_pro
vrf ivrf
match identity group test
client authentication list test_list
isakmp authorization list test_list
client configuration address respond
accounting test_list
crypto ipsec transform-set t3 esp-3des esp-sha-hmac
!
crypto dynamic-map remote 10
set transform-set t3
set isakmp-profile test_pro
reverse-route
!
!
crypto map map-ra local-address GigabitEthernet2/1
crypto map map-ra 11 ipsec-isakmp dynamic remote
!
!
!
interface GigabitEthernet2/1
mtu 9216
ip address 120.0.0.254 255.255.255.0
ip flow ingress
logging event link-status
mls qos trust ip-precedence
crypto engine slot 1/0 outside
!
!
interface GigabitEthernet1/0/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,100,1002-1005
switchport mode trunk
mtu 9216
mls qos trust ip-precedence
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet1/0/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
mls qos trust ip-precedence
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface Vlan100
ip vrf forwarding ivrf
ip address 120.0.0.100 255.255.255.0
ip flow ingress
crypto map map-ra
crypto engine slot 1/0 inside
!
!
ip local pool pool1 100.0.1.1 100.0.5.250
VRF Mode PE Configuration Example
The following example shows a VRF mode configuration for a provider edge (PE):
!
version 12.2
!
hostname EXAMPLE-PE
!
no aaa new-model
ip subnet-zero
!
ip vrf vrf1
rd 1000:1
route-target export 1000:1
route-target import 1000:1
!
crypto engine mode vrf
!
redundancy
mode sso
main-cpu
auto-sync running-config
auto-sync standard
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
power redundancy-mode combined
!
vlan internal allocation policy ascending
vlan access-log ratelimit 2000
!
crypto keyring key0
pre-shared-key address 11.0.0.1 key mykey
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
lifetime 500
crypto isakmp profile prof1
vrf vrf1
keyring key0
self-identity user-fqdn a@example.com
match identity address 11.0.0.1 255.255.255.255
!
crypto ipsec transform-set proposal1 ah-sha-hmac esp-3des esp-sha-hmac
!
crypto map testtag local-address Vlan3
crypto map testtag 10 ipsec-isakmp
set peer 11.0.0.1
set security-association lifetime seconds 1000
set transform-set proposal1
set pfs group2
set isakmp-profile prof1
match address 101
!
interface GigabitEthernet1/1
no ip address
shutdown
!
interface GigabitEthernet1/2
switchport
switchport access vlan 3
switchport mode access
no ip address
!
interface GigabitEthernet1/14
ip vrf forwarding vrf1
ip address 13.0.0.1 255.255.255.0
!
interface GigabitEthernet6/0/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 2
switchport mode trunk
mtu 9216
no ip address
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet6/0/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan none
switchport mode trunk
mtu 9216
no ip address
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet7/1
no ip address
shutdown
!
interface GigabitEthernet7/2
ip address 17.1.5.4 255.255.0.0
media-type rj45
!
interface Vlan1
no ip address
shutdown
!
interface Vlan2
ip vrf forwarding vrf1
ip address 12.0.0.252 255.255.255.0
crypto map testtag
crypto engine subslot 6/0
!
interface Vlan3
ip address 11.0.0.2 255.255.255.0
crypto engine subslot 6/0
!
ip classless
ip route 223.255.254.0 255.255.255.0 17.1.0.1
!
no ip http server
!
access-list 101 permit ip host 13.0.0.2 host 12.0.0.2
!
control-plane
!
dial-peer cor custom
!
line con 0
exec-timeout 0 0
line vty 0 4
login
!
end
VRF Mode CE Configuration Example
The following example shows a VRF mode configuration for a customer edge (CE):
!
version 12.2
!
hostname EXAMPLE-CE
!
no aaa new-model
ip subnet-zero
!
redundancy
mode sso
main-cpu
auto-sync running-config
auto-sync standard
spanning-tree mode pvst
!
power redundancy-mode combined
!
vlan internal allocation policy ascending
vlan access-log ratelimit 2000
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
lifetime 500
crypto isakmp key mykey address 11.0.0.2
!
crypto ipsec transform-set proposal1 ah-sha-hmac esp-3des esp-sha-hmac
!
crypto map testtag 10 ipsec-isakmp
set peer 11.0.0.2
set security-association lifetime seconds 1000
set transform-set proposal1
set pfs group2
match address 101
!
interface GigabitEthernet1/1
ip address 12.0.0.1 255.255.255.0
load-interval 30
no keepalive
!
interface GigabitEthernet1/2
switchport
switchport access vlan 3
switchport mode access
no ip address
!
interface GigabitEthernet5/2
ip address 17.1.5.3 255.255.0.0
media-type rj45
!
interface GigabitEthernet6/0/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 2
switchport mode trunk
mtu 9216
no ip address
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet6/0/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 3
switchport mode trunk
mtu 9216
no ip address
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet6/1/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan none
switchport mode trunk
mtu 9216
no ip address
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet6/1/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan none
switchport mode trunk
mtu 9216
no ip address
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface Vlan1
no ip address
shutdown
!
interface Vlan2
ip address 11.0.0.1 255.255.255.0
no mop enabled
crypto map testtag
crypto engine subslot 6/0
!
interface Vlan3
no ip address
crypto connect vlan 2
!
ip classless
ip route 13.0.0.0 255.0.0.0 11.0.0.2
ip route 223.255.254.0 255.255.255.0 17.1.0.1
!
no ip http server
!
access-list 101 permit ip host 12.0.0.2 host 13.0.0.2
!
control-plane
!
dial-peer cor custom
!
line con 0
exec-timeout 0 0
line vty 0 4
login
!
end
VRF Mode Tunnel Protection Configuration Example
The following example shows a VRF mode configuration with tunnel protection:
ip vrf coke
rd 1000:1
route-target export 1000:1
route-target import 1000:1
!
crypto keyring key1
pre-shared-key address 100.1.1.1 key happy-eddie
!
crypto isakmp policy 1
authentication pre-share
crypto isakmp profile prof1
keyring key1
match identity address 100.1.1.1 255.255.255.255
!
crypto ipsec transform-set TR esp-des esp-md5-hmac
mode transport
!
crypto ipsec profile tp
set transform-set TR
set isakmp-profile prof1
!
!
crypto engine mode vrf
!
interface Tunnel1
ip vrf forwarding coke
ip address 10.1.1.254 255.255.255.0
tunnel source 172.1.1.1
tunnel destination 100.1.1.1
tunnel protection ipsec profile tp
crypto engine slot 4/0 inside
!
interface GigabitEthernet4/0/1
!IPsec VPN SPA inside port
flowcontrol receive on
flowcontrol send off
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
cdp enable
spanning-tree portfast trunk
!
interface GigabitEthernet4/0/2
!IPsec VPN SPA outside port
no ip address
flowcontrol receive on
flowcontrol send off
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
cdp enable
spanning-tree portfast trunk
!
interface GigabitEthernet6/1
ip address 172.1.1.1 255.255.255.0
crypto engine slot 4/0 outside
!
interface FastEthernet7/13
ip vrf forwarding coke
ip address 13.1.1.2 255.255.255.0
!
ip route 100.1.1.1 255.255.255.255 Tunnel1
IP Multicast in VRF Mode Configuration Example
Note If two IPsec VPN SPAs are present in the Cisco 7600 SSC-400, one will be shut down if the hw-module slot X subslot Y only command is in the configuration. In this case, the IPsec VPN SPA in subslot Y will be active, and the IPsec VPN SPA in the other subslot will be disabled.
The following example shows how to configure IP multicast over GRE:
hostname router-1
!
ip vrf ivrf
rd 1000:1
route-target export 1000:1
route-target import 1000:1
!
!
!
ip multicast-routing vrf ivrf
!
crypto engine mode vrf
!
!
hw-module slot 4 subslot 0 only
!
crypto keyring key1
pre-shared-key address 11.0.0.0 255.0.0.0 key 12345
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
crypto isakmp profile isa_prof
keyring key1
match identity address 11.0.0.0 255.0.0.0
!
crypto ipsec transform-set proposal esp-3des
mode transport
!
crypto ipsec profile vpnprof
set transform-set proposal
set isakmp-profile isa_prof
!
!
!
interface Tunnel1
ip vrf forwarding ivrf
ip address 20.1.1.1 255.255.255.0
ip mtu 9216
ip hold-time eigrp 1 3600
ip pim sparse-mode
tunnel source 1.0.1.1
tunnel destination 11.1.1.1
tunnel protection ipsec profile vpnprof
crypto engine slot 4/0 inside
!
interface Loopback1
ip address 1.0.1.1 255.255.255.0
!
interface GigabitEthernet1/1
mtu 9216
ip vrf forwarding ivrf
ip address 50.1.1.1 255.0.0.0
ip pim sparse-mode
!
interface GigabitEthernet1/2
mtu 9216
ip address 9.1.1.1 255.255.255.0
crypto engine slot 4/0 outside
!
!
interface GigabitEthernet4/0/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet4/0/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
router eigrp 1
!
address-family ipv4 vrf ivrf
autonomous-system 1
network 20.1.1.0 0.0.0.255
network 50.1.1.0 0.0.0.255
no auto-summary
no eigrp log-neighbor-changes
exit-address-family
!
router ospf 1
log-adjacency-changes
network 1.0.0.0 0.255.255.255 area 0
network 9.0.0.0 0.255.255.255 area 0
!
ip pim vrf ivrf rp-address 50.1.1.1
!
IPsec Virtual Tunnel Interfaces Configuration Examples
The following examples show VRF mode configurations that use VTI:
•IPsec Virtual Tunnel Interface FVRF Configuration Example
•IPsec Virtual Tunnel Interface in the Global Context Configuration Example
•IPsec Virtual Tunnel Interface Multicast Configuration Example
IPsec Virtual Tunnel Interface FVRF Configuration Example
The following example configuration shows an FVRF VTI configuration:
hostname router-1
!
!
ip vrf fvrf
rd 2000:1
route-target export 2000:1
route-target import 2000:1
!
ip vrf ivrf
rd 1000:1
route-target export 1000:1
route-target import 1000:1
!
crypto engine mode vrf
!
crypto keyring key1 vrf fvrf
pre-shared-key address 11.1.1.1 key cisco47
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
!
crypto isakmp profile isa_prof
keyring key1
match identity address 11.1.1.1 255.255.255.255 fvrf
crypto ipsec transform-set proposal esp-3des esp-sha-hmac
!
!
crypto ipsec profile vpnprof
set transform-set proposal
set isakmp-profile isa_prof
!
!
!
!
!
interface Tunnel1
ip vrf forwarding ivrf
ip address 20.1.1.1 255.255.255.0
ip pim sparse-mode
ip ospf network broadcast
ip ospf priority 2
tunnel source 1.0.0.1
tunnel destination 11.1.1.1
tunnel mode ipsec ipv4
tunnel vrf fvrf
tunnel protection ipsec profile vpnprof
crypto engine slot 4/0 inside
!
interface Loopback1
ip vrf forwarding fvrf
ip address 1.0.0.1 255.255.255.0
!
interface GigabitEthernet1/1
!switch inside port
ip vrf forwarding ivrf
ip address 50.0.0.1 255.255.255.0
!
interface GigabitEthernet1/2
!switch outside port
ip vrf forwarding fvrf
ip address 9.1.1.1 255.255.255.0
crypto engine slot 4/0 outside
!
interface GigabitEthernet4/0/1
!IPsec VPN SPA inside port
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet4/0/2
!IPsec VPN SPA outside port
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
router ospf 1 vrf ivrf
log-adjacency-changes
network 20.1.1.0 0.0.0.255 area 0
network 21.1.1.0 0.0.0.255 area 0
network 50.0.0.0 0.0.0.255 area 0
!
ip classless
ip route vrf fvrf 11.1.1.0 255.255.255.0 9.1.1.254
IPsec Virtual Tunnel Interface in the Global Context Configuration Example
The following example configuration shows IPsec VTI configuration in the global context:
!
crypto engine mode vrf
!
crypto keyring key1
pre-shared-key address 14.0.0.2 key 12345
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
!
crypto isakmp profile prof1
keyring key1
match identity address 14.0.0.2 255.255.255.255
!
crypto ipsec transform-set t-set1 esp-3des esp-sha-hmac
!
crypto ipsec profile prof1
set transform-set t-set1
set isakmp-profile prof1
!
!
interface Tunnel1
ip address 122.0.0.2 255.255.255.0
tunnel source 15.0.0.2
tunnel destination 14.0.0.2
tunnel mode ipsec ipv4
tunnel protection ipsec profile prof1
crypto engine slot 2/0 inside
!
interface Loopback2
ip address 15.0.0.2 255.255.255.0
!
interface GigabitEthernet1/3
ip address 172.2.1.1 255.255.255.0
crypto engine slot 2/0 outside
!
interface GigabitEthernet2/0/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet2/0/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
!
ip route 14.0.0.0 255.0.0.0 172.2.1.2
ip route 172.0.0.0 255.0.0.0 172.2.1.2
IPsec Virtual Tunnel Interface Multicast Configuration Example
The following example shows how to configure multicast over VTI:
hostname router-1
!
ip vrf ivrf
rd 1000:1
route-target export 1000:1
route-target import 1000:1
!
!
!
ip multicast-routing vrf ivrf
!
crypto engine mode vrf
!
!
!
crypto keyring key1
pre-shared-key address 11.0.0.0 255.0.0.0 key 12345
!
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
crypto isakmp profile isa_prof
keyring key1
match identity address 11.0.0.0 255.0.0.0
!
crypto ipsec transform-set proposal esp-3des
!
crypto ipsec profile vpnprof
set transform-set proposal
set isakmp-profile isa_prof
!
!
!
interface Tunnel1
ip vrf forwarding ivrf
ip address 20.1.1.1 255.255.255.0
ip mtu 9216
ip hold-time eigrp 1 3600
ip pim sparse-mode
tunnel source 1.0.1.1
tunnel destination 11.1.1.1
tunnel mode ipsec ipv4
tunnel protection ipsec profile vpnprof
crypto engine slot 4/0 inside
!
interface Loopback1
ip address 1.0.1.1 255.255.255.0
!
interface GigabitEthernet1/1
mtu 9216
ip vrf forwarding ivrf
ip address 50.1.1.1 255.0.0.0
ip pim sparse-mode
!
interface GigabitEthernet1/2
mtu 9216
ip address 9.1.1.1 255.255.255.0
crypto engine slot 4/0 outside
!
!
interface GigabitEthernet4/0/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
interface GigabitEthernet4/0/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,1002-1005
switchport mode trunk
mtu 9216
flowcontrol receive on
flowcontrol send off
spanning-tree portfast trunk
!
router eigrp 1
!
address-family ipv4 vrf ivrf
autonomous-system 1
network 20.1.1.0 0.0.0.255
network 50.1.1.0 0.0.0.255
no auto-summary
no eigrp log-neighbor-changes
exit-address-family
!
router ospf 1
log-adjacency-changes
network 1.0.0.0 0.255.255.255 area 0
network 9.0.0.0 0.255.255.255 area 0
!
ip pim vrf ivrf rp-address 50.1.1.1
!
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