MPLS VPN Half-Duplex VRF
First Published: May 2, 2005
Last Updated: May 9, 2008
The MPLS VPN Half-Duplex VRF feature provides scalable hub-and-spoke connectivity for subscribers of an Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) service. This feature addresses the limitations previously imposed on hub-and-spoke topologies by removing the requirement of one Virtual Routing and Forwarding (VRF) per spoke. This feature also ensures that subscriber traffic always traverses the central link between the wholesale service provider and the Internet service provider (ISP), whether the subscriber traffic is being routed to a remote network by way of the upstream ISP or to another locally or remotely connected subscriber.
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Contents
•Prerequisites for Configuring MPLS VPN Half-Duplex VRF
•Restrictions for MPLS VPN Half-Duplex VRF
•Information About Configuring MPLS VPN Half-Duplex VRF
•How to Configure MPLS VPN Half-Duplex VRF
•Configuration Examples for MPLS VPN Half-Duplex VRF
•Additional References
•Feature Information for MPLS VPN Half-Duplex VRF
Prerequisites for Configuring MPLS VPN Half-Duplex VRF
You must have a working MPLS core network.
Restrictions for MPLS VPN Half-Duplex VRF
The following features are not supported on interfaces configured with the MPLS VPN Half-Duplex VRF feature:
•Multicast
•MPLS VPN Carrier Supporting Carrier
•MPLS VPN Interautonomous Systems
Information About Configuring MPLS VPN Half-Duplex VRF
To configure this feature, you need to understand the following concepts:
•MPLS VPN Half-Duplex VRF Overview
•Upstream and Downstream VRFs
•Reverse Path Forwarding Check
For information about this feature on the Cisco 10000 series routers, see the "Half-Duplex VRF" section of the "Configuring Multiprotocol Label Switching" chapter in the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide.
MPLS VPN Half-Duplex VRF Overview
The MPLS VPN Half-Duplex VRF feature provides the following benefits:
•The MPLS VPN Half-Duplex VRF feature prevents local connectivity between subscribers at the spoke provider edge (PE) router and ensures that a hub site provides subscriber connectivity. Any sites that connect to the same PE router must forward intersite traffic using the hub site. This ensures that the routing done at the spoke site moves from the access-side interface to the network-side interface or from the network-side interface to the access-side interface, but never from the access-side interface to the access-side interface.
•The MPLS VPN Half-Duplex VRF feature prevents situations where the PE router locally switches the spokes without passing the traffic through the upstream ISP. This prevents subscribers from directly connecting to each other, which causes the wholesale service provider to lose revenue.
•The MPLS VPN Half-Duplex VRF feature improves scalability by removing the requirement of one VRF per spoke. When the feature is not configured, when spokes are connected to the same PE router each spoke is configured in a separate VRF to ensure that the traffic between the spokes traverses the central link between the wholesale service provider and the ISP. However, this configuration is not scalable. When many spokes connected to the same PE router, configuration of VRFs for each spoke becomes quite complex and greatly increases memory usage. This is especially true in large-scale wholesale service provider environments that support high-density remote access to Layer 3 VPNs.
Figure 1 shows a sample hub-and-spoke topology.
Figure 1 Hub-and-Spoke Topology
Upstream and Downstream VRFs
The MPLS VPN Half-Duplex VRF feature uses two unidirectional VRFs to forward IP traffic between the spokes and the hub PE router:
•The upstream VRF forwards IP traffic from the spokes toward the hub PE router. This VRF typically contains only a default route but might also contain summary routes and several default routes. The default route points to the interface on the hub PE router that connects to the upstream ISP. The router dynamically learns about the default route from the routing updates that the hub PE router or home gateway sends.
Note Although the upstream VRF is typically populated from the hub, it is possible also to have a separate local upstream interface on the spoke PE for a different local service that would not be required to go through the hub: for example, a local Domain Name System (DNS) or game server service.
•The downstream VRF forwards traffic from the hub PE router back to the spokes. This VRF can contain:
–PPP peer routes for the spokes and per-user static routes received from the authentication, authorization, and accounting (AAA) server or from the Dynamic Host Control Protocol (DHCP) server
–Routes imported from the hub PE router
–Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), Routing Information Protocol (RIP), or Enhanced Interior Gateway Routing Protocol (EIGRP) dynamic routes for the spokes
The spoke PE router redistributes routes from the downstream VRF into Multiprotocol Border Gateway Protocol (MP-BGP). That router typically advertises a summary route across the MPLS core for the connected spokes. The VRF configured on the hub PE router imports the advertised summary route.
Reverse Path Forwarding Check
The Reverse Path Forwarding (RPF) check ensures that an IP packet that enters a router uses the correct inbound interface. The MPLS VPN Half-Duplex VRF feature supports unicast RPF check on the spoke-side interfaces. Because different VRFs are used for downstream and upstream forwarding, the RPF mechanism ensures that source address checks occur in the downstream VRF.
Unicast RPF is not on by default. You need to enable it, as described in Configuring Unicast Reverse Path Forwarding.
How to Configure MPLS VPN Half-Duplex VRF
This section contains the following procedures:
•Configuring the Upstream and Downstream VRFs on the Spoke PE Router (required)
•Associating a VRF with an Interface (required)
•Configuring the Downstream VRF for an AAA Server (optional)
•Verifying MPLS VPN Half-Duplex VRF Configuration (optional)
To configure this feature on the Cisco 10000 series routers, see the "Half-Duplex VRF" section of the "Configuring Multiprotocol Label Switching" chapter in the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide.
Configuring the Upstream and Downstream VRFs on the Spoke PE Router
To configure the upstream and downstream VRFs on the PE router or on the spoke PE router, use the following procedure.
SUMMARY STEPS
1. enable
2. configure terminal
3. vrf definition vrf-name
4. rd route-distinguisher
5. address-family {ipv4 | ipv6}
6. route-target {import | export | both} route-target-ext-community
7. exit-address-family
8. end
DETAILED STEPS
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Step 1 |
enable
Router> enable |
Enables privileged EXEC mode. •Enter your password if prompted. |
Step 2 |
configure terminal
Router# configure terminal |
Enters global configuration mode. |
Step 3 |
vrf definition vrf-name
Router(config)# vrf definition vrf1 |
Configures a VRF routing table and enters VRF configuration mode. •The vrf-name argument is the name of the VRF. |
Step 4 |
rd route-distinguisher
Router(config-vrf)# rd 100:1 |
Creates routing and forwarding tables for a VRF. •The route-distinguisher argument specifies to add an 8-byte value to an IPv4 prefix to create a VPN IPv4 prefix. You can enter a route distinguisher in either of these formats: –16-bit autonomous system number (ASN): your 32-bit number For example, 101:3. –32-bit IP address: your 16-bit number For example, 192.168.122.15:1. |
Step 5 |
address-family {ipv4 | ipv6}
Router(config-vrf) address-family ipv4 |
Enters VRF address family configuration mode to specify an address family for a VRF. •The ipv4 keyword specifies an IPv4 address family for a VRF. •The ipv6 keyword specifies an IPv6 address family for a VRF. Note The MPLS VPN Half Duplex VRF feature supports only IPv4 address family. |
Step 6 |
route-target {import | export | both} route-target-ext-community
Router(config-vrf-af)# route-target both 100:2 |
Creates a route-target extended community for a VRF. •The import keyword specifies to import routing information from the target VPN extended community. •The export keyword specifies to export routing information to the target VPN extended community. •The both keyword specifies to import both import and export routing information to the target VPN extended community. •The route-target-ext-community argument adds the route-target extended community attributes to the VRF's list of import, export, or both (import and export) route-target extended communities. |
Step 7 |
exit-address-family
Router(config-vrf-af)# exit-address-family |
Exits from VRF address family configuration mode. |
Step 8 |
end
Router(config-vrf-af)# end |
Exits to privileged EXEC mode. |
Associating a VRF with an Interface
Perform the following task to associate a VRF with an interface, which activates the VRF.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface type number
4. vrf forwarding vrf-name
5. ip address ip-address mask [secondary]
6. end
DETAILED STEPS
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|
|
Step 1 |
enable
Router> enable |
Enables privileged EXEC mode. •Enter your password if prompted. |
Step 2 |
configure terminal
Router# configure terminal |
Enters global configuration mode. |
Step 3 |
interface type number
Router(config)# interface Ethernet 0/1 |
Configures an interface type and enters interface configuration mode. •The type argument identifies the type of interface to be configured. •The number argument identifies the port, connector, or interface card number. |
Step 4 |
vrf forwarding vrf-name [downstream vrf2]
Router(config-if)# vrf forwarding vrf1 |
Associates a VRF with an interface or subinterface. •The vrf-name argument is the name of the VRF. •The downstream vrf2 is the name of the downstream VRF into which peer and per-user routes are installed. |
Step 5 |
ip address ip-address mask [secondary]
Router(config-if)# ip address 10.24.24.24 255.255.255.255 |
Sets a primary or secondary IP address for an interface. •The ip-address argument is the IP address. •The mask argument is the mask of the associated IP subnet. •The secondary keyword specifies that the configured address is a secondary IP address. If this keyword is omitted, the configured address is the primary IP address. |
Step 6 |
end
Router(config-if) end |
Exits to privileged EXEC mode. |
Configuring the Downstream VRF for an AAA Server
To configure the downstream VRF for an AAA (RADIUS) server in broadband or remote access situations, enter the following Cisco attribute value:
lcp:interface-config=ip vrf forwarding U downstream D
In standard VPN situations, enter instead the following Cisco attribute value:
ip:vrf-id=U downstream D
Verifying MPLS VPN Half-Duplex VRF Configuration
To verify the Downstream VRF for an AAA Server configuration, perform the following steps.
SUMMARY STEPS
1. show vrf [brief | detail | id | interfaces | lock | select ] [vrf-name]
2. show ip route vrf vrf-name
3. show running-config [interface type number]
DETAILED STEPS
Step 1 show vrf [brief | detail | id | interfaces | lock | select ] [vrf-name]
Use this command to display information about all of the VRFs configured on the router, including the downstream VRF for each associated interface or VAI:
Name Default RD Interfaces
show vrf detail vrf-name
Use this command to display detailed information about the VRF you specify, including all interfaces, subinterfaces, and VAIs associated with the VRF.
If you do not specify a value for the vrf-name argument, detailed information about all of the VRFs configured on the router appears.
The following example shows how to display detailed information for the VRF called vrf1, in a broadband or remote access case:
Router# show vrf detail vrf1
VRF D; default RD 2:0; default VPNID <not set>
Loopback2 Virtual-Access3 [D] Virtual-Access4 [D]
Connected addresses are not in global routing table
Export VPN route-target communities
Import VPN route-target communities
VRF U; default RD 2:1; default VPNID <not set>
Virtual-Access3 Virtual-Access4
Connected addresses are not in global routing table
No Export VPN route-target communities
Import VPN route-target communities
The following example shows the VRF detail in a standard VPN situation:
VRF Down; default RD 100:1; default VPNID <not set> VRF Table ID = 1
Description: import only from hub-pe
Pos3/0/3 [D] Pos3/0/1:0.1 [D]
Connected addresses are not in global routing table
Export VPN route-target communities
Import VPN route-target communities
VRF label distribution protocol: not configured
VRF Up; default RD 100:2; default VPNID <not set> VRF Table ID = 2
Connected addresses are not in global routing table
No Export VPN route-target communities
Import VPN route-target communities
VRF label distribution protocol: not configured
Step 2 show ip route vrf vrf-name
Use this command to display the IP routing table for the VRF you specify, and information about the per-user routes installed in the downstream VRF.
The following example shows how to display the routing table for the downstream VRF named D, in a broadband or remote access situation:
Router# show ip route vrf D
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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS interarea
* - 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, 5 subnets, 2 masks
U 10.0.0.2/32 [1/0] via 10.0.0.1
S 10.0.0.0/8 is directly connected, Null0
U 10.0.0.5/32 [1/0] via 10.0.0.2
C 10.8.1.2/32 is directly connected, Virtual-Access4
C 10.8.1.1/32 is directly connected, Virtual-Access3
The following example shows how to display the routing table for the downstream VRF named Down, in a standard VPN situation:
Router# show ip route vrf Down
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 10.13.13.13 to network 0.0.0.0
C 10.2.0.0/8 is directly connected, Pos3/0/3
10.3.0.0/32 is subnetted, 1 subnets
B 10.4.16.16 [200/0] via 10.13.13.13, 1w3d
B 10.6.0.0/8 [200/0] via 10.13.13.13, 1w3d
C 10.0.0.0/8 is directly connected, Pos3/0/1
10.7.0.0/16 is subnetted, 1 subnets
B 10.7.0.0 [20/0] via 10.0.0.2, 1w3d
10.0.6.0/32 is subnetted, 1 subnets
B 10.0.6.14 [20/0] via 10.0.0.2, 1w3d
10.8.0.0/32 is subnetted, 1 subnets
B 10.8.15.15 [20/0] via 10.0.0.2, 1w3d
B* 0.0.0.0/0 [200/0] via 10.0.0.13, 1w3d
The following example shows how to display the routing table for the upstream VRF named U in a broadband or remote access situation:
Router# show ip route vrf U
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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS interarea
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 192.168.0.20 to network 0.0.0.0
10.0.0.0/32 is subnetted, 1 subnets
C 10.0.0.8 is directly connected, Loopback2
B* 0.0.0.0/0 [200/0] via 192.168.0.20, 1w5d
The following example shows how to display the routing table for the upstream VRF named Up in a standard VPN situation:
Router# show ip route vrf Up
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 10.13.13.13 to network 0.0.0.0
10.2.0.0/32 is subnetted, 1 subnets
C 10.2.0.1 is directly connected, Pos3/0/3
10.3.0.0/32 is subnetted, 1 subnets
B 10.3.16.16 [200/0] via 10.13.13.13, 1w3d
B 10.6.0.0/8 [200/0] via 10.13.13.13, 1w3d
10.0.0.0/32 is subnetted, 1 subnets
C 10.0.0.1 is directly connected, Pos3/0/1
B* 0.0.0.0/0 [200/0] via 10.13.13.13, 1w3d
Step 3 show running-config [interface type number]
Use this command to display information about the interfaceyou specify, including information about the associated upstream and downstream VRFs.
The following example shows how to display information about the subinterface named POS3/0/1:
Router# show running-config interface POS3/0/1
Building configuration...
Current configuration : 4261 bytes
ip vrf forwarding Up downstream Down
ip address 10.0.0.1 255.0.0.0
Configuration Examples for MPLS VPN Half-Duplex VRF
This section provides the following configuration examples:
•Configuring the Upstream and Downstream VRFs on the Spoke PE Router: Example
•Associating a VRF with an Interface: Example
•Configuring MPLS VPN Half-Duplex VRF: Example Using Static CE-PE Routing
•Configuring MPLS VPN Half-Duplex VRF: Example Using RADIUS Server and Static CE-PE Routing
•Configuring MPLS VPN Half-Duplex VRF: Example Using Dynamic CE-PE Routing
Configuring the Upstream and Downstream VRFs on the Spoke PE Router: Example
The following example configures an upstream VRF named Up:
Router# configure terminal
Router(config)# vrf definition Up
Router(config-vrf)# rd 1:0
Router(config-vrf)# address-family ipv4
Router(config-vrf-af)# route-target import 1:0
Router(config-vrf-af)# exit-address-family
The following example configures a downstream VRF named Down:
Router# configure terminal
Router(config)# vrf definition Down
Router(config-vrf)# rd 1:8
Router(config-vrf)# address-family ipv4
Router(config-vrf-af)# route-target import 1:8
Router(config-vrf-af)# exit-address-family
Associating a VRF with an Interface: Example
The following example associates the VRF named Up with the POS3/0/1 subinterface and specifies the downstream VRF named Down:
Router# configure terminal
Router(config)# interface POS 3/0/1
Router(config-if)# vrf forwarding Up downstream Down
Router(config-if)# ip address 10.0.0.1 255.0.0.0
Configuring MPLS VPN Half-Duplex VRF: Example Using Static CE-PE Routing
This example uses the hub-and-spoke topology shown in Figure 2 with local authentication (that is, the RADIUS server is not used).
Figure 2 Sample Topology
route-target export 1:100
ip address 10.0.0.8 255.255.255.255
Configuring MPLS VPN Half-Duplex VRF: Example Using RADIUS Server and Static CE-PE Routing
The following example shows how to connect two Point-to-Point Protocol over Ethernet (PPPoE) clients to a single VRF pair on the spoke PE router named Router C. Although both PPPoE clients are configured in the same VRF, all communication occurs using the hub PE router. Half-duplex VRFs are configured on the spoke PE. The client configuration is downloaded to the spoke PE from the RADIUS server.
This example uses the hub-and-spoke topology shown in Figure 2.
Note The wholesale provider can forward the user authentication request to the corresponding ISP. If the ISP authenticates the user, the wholesale provider appends the VRF information to the request that goes back to the PE router.
aaa group server radius R
server 10.0.20.26 auth-port 1812 acct-port 1813
aaa authentication ppp default group radius
aaa authorization network default group radius
description Downstream VRF - to spokes
route-target export 1:100
description Upstream VRF - to hub
ip address 10.0.0.8 255.255.255.255
interface virtual-template 1
neighbor 172.16.0.34 remote-as 1
neighbor 172.16.0.34 update-source Loopback0
neighbor 172.16.0.34 activate
neighbor 172.16.0.34 send-community extended
address-family ipv4 vrf U
address-family ipv4 vrf D
ip local pool U-pool 10.8.1.1 2.8.1.100
ip route vrf D 10.0.0.0 255.0.0.0 Null0
radius-server host 10.0.20.26 auth-port 1812 acct-port 1813
Configuring MPLS VPN Half-Duplex VRF: Example Using Dynamic CE-PE Routing
The following example shows how to use OSPF to dynamically advertise the routes on the spoke sites.
This example uses the hub-and-spoke topology shown in Figure 2.
Creating the VRFs
route-target export 100:0
route-target import 100:1
Enabling MPLS
mpls ldp graceful-restart
mpls ldp router-id Loopback0 force
Configuring BGP Toward Core
no bgp default ipv4-unicast
bgp graceful-restart restart-time 120
bgp graceful-restart stalepath-time 360
neighbor 10.13.13.13 remote-as 100
neighbor 10.13.13.13 update-source Loopback0
neighbor 10.13.13.13 activate
neighbor 10.13.13.13 send-community extended
Configuring BGP Toward Edge
address-family ipv4 vrf Up
address-family ipv4 vrf Down
redistribute ospf 1000 vrf Down
Spoke PE's Core-Facing Interfaces and Processes
ip address 10.11.11.11 255.255.255.255
ip address 10.0.1.1 255.0.0.0
auto-cost reference-bandwidth 1000
redistribute connected subnets
network 10.11.11.11 0.0.0.0 area 100
network 10.0.1.0 0.255.255.255 area 100
Spoke PE's Edge-Facing Interfaces and Processes
ip address 10.22.22.22 255.255.255.255
vrf forwarding Up downstream Down
ip address 10.0.0.1 255.0.0.0
vrf forwarding Up downstream Down
ip address 10.2.0.1 255.0.0.0
router ospf 1000 vrf Down
auto-cost reference-bandwidth 1000
redistribute connected subnets
redistribute bgp 100 metric-type 1 subnets
network 10.22.22.22 0.0.0.0 area 300
network 10.0.0.0 0.255.255.255 area 300
network 10.2.0.0 0.255.255.255 area 300
default-information originate
Additional References
The following sections provide references related to the MPLS VPN Half-Duplex VRFs feature.
Related Documents
Standards
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No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
— |
MIBs
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No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs |
RFCs
Technical Assistance
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The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. |
http://www.cisco.com/techsupport |
Feature Information for MPLS VPN Half-Duplex VRF
Table 1 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
Table 1 Feature Information for MPLS VPN Half-Duplex VRF
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MPLS VPN - Half Duplex VRF (HDVRF) Support with Static Routing |
12.3(6) 12.3(11)T 12.2(28)SB |
This feature ensures that VPN clients that connect to the same PE router at the edge of the MPLS VPN use the hub site to communicate. In 12.3(6), this feature was introduced. In 12.4(20)T, this feature was integrated. In 12.2(28)SB, this feature was integrated |
MPLS VPN Half-Duplex VRF |
12.2(28)SB2 12.4(20)T 12.2(33)SRC |
In 12.2(28)SB2, support for dynamic routing protocols was added. For the Cisco 10000 series routers, see the "Half-Duplex VRF" section of the "Configuring Multiprotocol Label Switching" chapter in the Cisco 10000 Series Router Broadband Aggregation, Leased-Line, and MPLS Configuration Guide at the following URL: http://www.cisco.com/univercd/cc/td/doc/product/aggr/10000/swconfig/cfggdes/bba/dffsrv.htm#wp1065648 In 12.4(20)T, this feature, with support for dynamic routing protocols, was integrated. In Cisco IOS Release 12.2(33)SRC this feature, with support for dynamic routing protocols, was integrated into the SR train. The following commands were introduced or modified: show ip interface, show vrf |
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