LISP ESM Multihop Mobility

The LISP ESM Multihop Mobility feature separates the Locator/ID Separation Protocol (LISP) dynamic host detection function from the LISP encapsulation/decapsulation function within a LISP topology.

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Restrictions for LISP ESM Multihop Mobility

  • Supports Locator/ID Separation Protocol (LISP) multihop mobility only in Extended Subnet Mode (ESM) with Overlay Transport Virtualization (OTV).

  • Requires OTV First Hop Redundancy Protocol (FHRP) isolation to avoid hair-pinning of traffic across the OTV Data Center Interconnect (DCI) framework.

  • Does not support Network Address Translated (NAT’d) endpoint identifiers (EIDs).

Information About LISP ESM Multihop Mobility

LISP ESM Multihop Mobility Overview

A first-hop router (FHR) detects the presence of a dynamic host endpoint identifier (EID) and notifies the site gateway xTR. A device configured as both an ingress tunnel router (ITR) and an egress tunnel router (ETR) is known as an xTR. The site gateway xTR registers the dynamic EID with a map server. The Site Gateway xTR performs Locator/ID Separation Protocol (LISP) encapsulation/decapsulation of the traffic from or to the dynamic EID to or from remote sites.

Figure 1. LISP ESM Multihop Mobility Sample Topology


Multiple Layer 3 hops can exist between the FHR and the site gateway xTR when deploying the LISP ESM Multihop Mobility feature. You can insert non-LISP devices like firewalls and load-balancers into the data center.


Note
LISP supports silent host moves from the 15.4(1)T release.

Note
LISP supports redistributing host routes for servers discovered by LISP into Interior Gateway Protocol (IGP) via Open Shortest Path First (OSPF) protocol/ Intermediate System-to-Intermediate System (IS-IS) protocol/ Routing Information Protocol (RIP)/ Border Gateway Protocol (BGP).

Perform the tasks shown below to configure LISP ESM multihop mobility on a Locator ID/Separation Protocol (LISP) site with three IPv4 routing locators (RLOCs). In these tasks, a LISP site uses a single edge router configured as both an ITR and an ETR (known as an xTR) with two connections to the upstream provider. Both the RLOCs and the endpoint identifier (EID) prefix are IPv4. The LISP site registers to a map resolver map server (MRMS) device in the network core. The topology used in this LISP configuration is shown in the figure below.

Figure 2. Topology for LISP ESM Multihop Mobility


The components illustrated in the topology shown in the above figure are described below:

LISP Site
  • The customer premises equipment (CPE) functions as a LISP ITR and ETR (xTR).
  • The LISP xTR is authoritative for the IPv4 EID prefix of 10.1.0.0/16.
  • The LISP xTR has two RLOC connections to the core. The RLOC connection to xTR-1 is 172.18.3.3; the RLOC connection to xTR-2 is 172.19.4.4.
Mapping System
  • An MRMS system is assumed to be available for the LISP xTRs to configure. The MRMS has IPv4 RLOCs 10.1.1.0 and 10.1.1.9.
  • Mapping services are assumed to be provided as part of this LISP solution via a private mapping system or as a public LISP mapping system.

How to Configure LISP ESM Multihop Mobility

Configuring First-Hop Router

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. router lisp
  4. locator-set locator-set-name
  5. ipv4-address priority priority-locator weight locator-weight
  6. Repeat Step 5 to configure another locator entry.
  7. exit
  8. eid-table default instance-id id
  9. dynamic-eid dynamic-eid-name
  10. database-mapping dynamic-eid-prefix/prefix-length locator-set name
  11. eid-notify ipv4-address key password
  12. map-notify-group ipv4-group-address
  13. exit
  14. exit
  15. exit
  16. interface type number
  17. lisp mobility dynamic-eid-name
  18. lisp extended-subnet-mode
  19. ip address ip-address mask
  20. standby group-number ip virtual-ip-address
  21. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:

Device> enable
Enables privileged EXEC mode.
  • Enter your password if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

router lisp

Example:

Device(config)# router lisp

Enters LISP configuration mode.

Step 4

locator-set locator-set-name

Example:

Device(config-router-lisp)# locator-set WestDC

Specifies a locator set and enters LISP locator-set configuration mode.

Step 5

ipv4-address priority priority-locator weight locator-weight

Example:

Device(config-router-lisp-locator-set)# 172.16.1.2 priority 10 weight 50

Configures the LISP locator set. The LISP locator set is the set of addresses that the first-hop router (FHR) uses while communicating with the gateway xTR. You can configure each locator address by creating a locator entry with an assigned priority and weight.

Step 6

Repeat Step 5 to configure another locator entry.

—

Step 7

exit

Example:

Device(config-router-lisp-locator-set)# exit

Exits LISP locator-set configuration mode and returns to LISP configuration mode.

Step 8

eid-table default instance-id id

Example:

Device(config-router-lisp)# eid-table default instance-id 0

Configures an association between the default virtual routing and forwarding (VRF) table and a LISP instance ID, and enters EID table configuration mode.

Step 9

dynamic-eid dynamic-eid-name

Example:

Device(config-router-lisp-eid-table)# dynamic-eid VMs

Specifies a LISP virtual machine (VM)-mobility (dynamic EID roaming) policy and enters dynamic EID configuration mode.

Step 10

database-mapping dynamic-eid-prefix/prefix-length locator-set name

Example:

Device(config-router-lisp-eid-table-dynamic-eid)# database-mapping 10.1.1.0/24 locator-set WestDC

Configures an IPv4 mapping relationship and an associated traffic policy for the LISP VM-mobility (dynamic EID) policy.

Note

 

You can enter the limit dynamic value keyword to limit the number of discoverable dynamic EIDs. However, if you have enabled debug mode (using the service internal command), then the number of discoverable dynamic EIDs will be increased to a fixed value of 65535.

Step 11

eid-notify ipv4-address key password

Example:

Device(config-router-lisp-eid-table-dynamic-eid)# eid-notify 192.0.2.21 key k

Enables sending of dynamic endpoint identifier (EID) presence notifications to a gateway xTR with the specified IPv4 address along with the authentication key used with the gateway xTR.

Step 12

map-notify-group ipv4-group-address

Example:

Device(config-router-lisp-eid-table-dynamic-eid)# map-notify-group 224.0.0.0

Specifies the IPv4 multicast group address used for sending and receiving site-based map-notify multicast messages.

Step 13

exit

Example:

Device(config-router-lisp-eid-table-dynamic-eid)# exit

Exits dynamic EID configuration mode and returns to EID table configuration mode.

Step 14

exit

Example:

Device(config-router-lisp-eid-table)# exit

Exits EID table configuration mode and returns to LISP configuration mode.

Step 15

exit

Example:

Device(config-router-lisp)# exit

Exits LISP configuration mode and returns to global configuration mode.

Step 16

interface type number

Example:

Device(config)# interface Vlan 11

Specifies the interface type and number and enters interface configuration mode.

Step 17

lisp mobility dynamic-eid-name

Example:

Device(config-if)# lisp mobility VMs

Allows EID mobility on the interface and specifies the name of the dynamic EID.

Step 18

lisp extended-subnet-mode

Example:

Device(config-if)# lisp extended-subnet-mode

Enables extended subnet mode on the interface.

Step 19

ip address ip-address mask

Example:

Device(config-if)# ip address 10.1.1.2 255.255.255.0

Configures an IPv4 address for a specific interface.

Step 20

standby group-number ip virtual-ip-address

Example:

Device(config-if)# standby 1 ip 10.1.1.1

Enables IPv4 Hot Standby Router Protocol (HSRP) and sets the virtual IP address.

Step 21

end

Example:

Device(config-if)# end

Returns to privileged EXEC mode.

Configuring Site Gateway xTR

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. router lisp
  4. locator-set locator-set-name
  5. ipv4-address priority priority-locator weight locator-weight
  6. exit
  7. eid-table default instance-id id
  8. database-mapping dynamic-eid-prefix/prefix-length locator-set name
  9. dynamic-eid dynamic-eid-name
  10. database-mapping dynamic-eid-prefix/prefix-length locator-set name
  11. eid-notify authentication-key password
  12. exit
  13. exit
  14. ipv4 itr map-resolver map-resolver-address
  15. ipv4 itr
  16. ipv4 etr map-server map-server-address key authentication-key
  17. ipv4 etr
  18. exit
  19. interface type number
  20. ip address ip-address mask
  21. lisp mobility dynamic-eid-name
  22. lisp extended-subnet-mode
  23. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:

Device> enable
Enables privileged EXEC mode.
  • Enter your password if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

router lisp

Example:

Device(config)# router lisp

Enters LISP configuration mode.

Step 4

locator-set locator-set-name

Example:

Device(config-router-lisp)# locator-set WestDC

Specifies a locator set and enters LISP locator-set configuration mode.

Step 5

ipv4-address priority priority-locator weight locator-weight

Example:

Device(config-router-lisp-locator-set)# 172.18.3.3 priority 10 weight 50

Configures the LISP locator set. The LISP locator set is the set of addresses used by the gateway xTR while encapsulating/decapsulating LISP traffic from and to the endpoint identifier (EID).

Step 6

exit

Example:

Device(config-router-lisp-locator-set)# exit

Exits LISP locator-set configuration mode and returns to LISP configuration mode.

Step 7

eid-table default instance-id id

Example:

Device(config-router-lisp)# eid-table default instance-id 0

Configures an association between the default virtual routing and forwarding (VRF) table and a LISP instance ID, and enters EID table configuration mode.

Step 8

database-mapping dynamic-eid-prefix/prefix-length locator-set name

Example:

Device(config-router-lisp-eid-table)# database-mapping 10.1.0.0/16 locator-set WestDC

Configures an IPv4 mapping relationship and an associated traffic policy for LISP virtual machine (VM)-mobility (dynamic EID) policy.

Note

 

You can enter the limit dynamic value keyword to limit the number of discoverable dynamic EIDs. However, if you have enabled debug mode (using the service internal command), then the number of discoverable dynamic EIDs will be increased to a fixed value of 65535.

Step 9

dynamic-eid dynamic-eid-name

Example:

Device(config-router-lisp-eid-table)# dynamic-eid VMs

Specifies a LISP VM-mobility (dynamic EID roaming) policy and enters dynamic EID configuration mode.

Step 10

database-mapping dynamic-eid-prefix/prefix-length locator-set name

Example:

Device(config-router-lisp-eid-table-dynamic-eid)# database-mapping 10.1.1.0/24 locator-set WestDC

Configures an IPv4 mapping relationship and an associated traffic policy for LISP VM-mobility (dynamic EID) policy.

Step 11

eid-notify authentication-key password

Example:

Device(config-router-lisp-eid-table-dynamic-eid)# eid-notify authentication-key k

Specifies the authentication key to validate the EID-notify sent from a first-hop router (FHR).

Step 12

exit

Example:

Device(config-router-lisp-eid-table-dynamic-eid)# exit

Exits dynamic EID configuration mode and returns to EID table configuration mode.

Step 13

exit

Example:

Device(config-router-lisp-eid-table)# exit

Exits EID table configuration mode and returns to LISP configuration mode.

Step 14

ipv4 itr map-resolver map-resolver-address

Example:

Device(config-router-lisp)# ipv4 itr map-resolver 172.20.5.5

Configures a locator address for the LISP map resolver to which this device will send map request messages for IPv4 EID-to-RLOC mapping resolutions.

  • The locator address of the map resolver may be an IPv4 or IPv6 address.

Note

 
You can configure up to 8 map resolvers if multiple map resolvers are available.

Step 15

ipv4 itr

Example:

Device(config-router-lisp)# ipv4 itr

Enables LISP ingress tunnel router (ITR) functionality for the IPv4 address family.

Step 16

ipv4 etr map-server map-server-address key authentication-key

Example:

Device(config-router-lisp)# ipv4 etr map-server 172.20.5.5 key mskey

Configures the IPv4 or IPv6 locator address of the LISP map server to be used by the egress tunnel router (ETR) when registering IPv4 endpoint identifiers (EIDs).

Step 17

ipv4 etr

Example:

Device(config-router-lisp)# ipv4 etr

Enables LISP ETR functionality for the IPv4 address family.

Step 18

exit

Example:

Device(config-router-lisp)# exit

Exits LISP configuration mode and returns to global configuration mode.

Step 19

interface type number

Example:

Device(config)# interface FastEthernet 1/4

Specifies the interface type and number and enters interface configuration mode.

Step 20

ip address ip-address mask

Example:

Device(config-if)# ip address 192.0.2.21 255.255.255.0

Configures an IPv4 address for the interface.

Step 21

lisp mobility dynamic-eid-name

Example:

Device(config-if)# lisp mobility VMs

Allows EID mobility on the interface and specifies the name of the dynamic EID.

Step 22

lisp extended-subnet-mode

Example:

Device(config-if)# lisp extended-subnet-mode

Enables extended subnet mode on the interface.

Step 23

end

Example:

Device(config-if)# end

Returns to privileged EXEC mode.

Configuring xTR

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. router lisp
  4. locator-set locator-set-name
  5. ipv4-address priority priority-locator weight locator-weight
  6. Repeat Step 5 to configure another locator entry.
  7. exit
  8. eid-table default instance-id id
  9. database-mapping dynamic-eid-prefix/prefix-length locator-set name
  10. exit
  11. ipv4 itr map-resolver map-resolver-address
  12. ipv4 itr
  13. ipv4 etr map-server map-server-address key authentication-key
  14. ipv4 etr
  15. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:

Device> enable
Enables privileged EXEC mode.
  • Enter your password if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

router lisp

Example:

Device(config)# router lisp

Enters LISP configuration mode.

Step 4

locator-set locator-set-name

Example:

Device(config-router-lisp)# locator-set Site3RLOCS

Specifies a locator set and enters LISP locator-set configuration mode.

Step 5

ipv4-address priority priority-locator weight locator-weight

Example:

Device(config-router-lisp-locator-set)# 203.0.113.2 priority 10 weight 50

Configures the LISP locator set. The LISP locator set is the set of addresses used by the gateway xTR while encapsulating/decapsulating LISP traffic from and to the endpoint identifier (EID).

Step 6

Repeat Step 5 to configure another locator entry.

—

Step 7

exit

Example:

Device(config-router-lisp-locator-set)# exit

Exits LISP locator set configuration mode and returns to LISP configuration mode.

Step 8

eid-table default instance-id id

Example:

Device(config-router-lisp)# eid-table default instance-id 0

Configures an association between the default VRF table and a LISP instance ID, and enters EID table configuration mode.

Step 9

database-mapping dynamic-eid-prefix/prefix-length locator-set name

Example:

Device(config-router-lisp-eid-table)# database-mapping 198.51.100.0/24 locator-set Site3RLOCS

Configures an IPv4 mapping relationship and an associated traffic policy for the LISP Virtual Machine (VM)-mobility (dynamic EID) policy.

Note

 

You can enter the limit dynamic value keyword to limit the number of discoverable dynamic EIDs. However, if you have enabled debug mode (using the service internal command), then the number of discoverable dynamic EIDs will be increased to a fixed value of 65535.

Step 10

exit

Example:

Device(config-router-lisp-eid-table)# exit

Exits EID table configuration mode and returns to LISP configuration mode.

Step 11

ipv4 itr map-resolver map-resolver-address

Example:

Device(config-router-lisp)# ipv4 itr map-resolver 172.20.5.5

Configures a locator address for the LISP map resolver to which this router will send map request messages for IPv4 EID-to-RLOC mapping resolutions.

  • The locator address of the map resolver may be an IPv4 or IPv6 address.

Note

 
You can configure up to 8 map resolvers if multiple map resolvers are available.

Step 12

ipv4 itr

Example:

Device(config-router-lisp)# ipv4 itr

Enables LISP ITR functionality for an IPv4 address family.

Step 13

ipv4 etr map-server map-server-address key authentication-key

Example:

Device(config-router-lisp)# ipv4 etr map-server 172.20.5.5 key k3

Configures IPv4 locator address of the LISP map server to be used by the egress tunnel router (ETR) when registering for IPv4 endpoint identifiers (EIDs).

Step 14

ipv4 etr

Example:

Device(config-router-lisp)# ipv4 etr

Enables LISP ETR functionality for an IPv4 address family.

Step 15

end

Example:

Device(config-if)# end

Returns to privileged EXEC mode.

Configuring Map Server Map Resolver

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. router lisp
  4. site site-name
  5. authentication-key password
  6. eid-prefix eid-prefix accept-more-specifics
  7. exit
  8. Repeat Step 4 to Step 7 to configure another LISP site.
  9. ipv4 map-server
  10. ipv4 map-resolver
  11. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:

Device> enable
Enables privileged EXEC mode.
  • Enter your password if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

router lisp

Example:

Device(config)# router lisp

Enters Locator ID/Separation Protocol (LISP) configuration mode.

Step 4

site site-name

Example:

Device(config-router-lisp)# site EastWestDC

Configures a LISP site and enters LISP site configuration mode on a LISP map server.

Step 5

authentication-key password

Example:

Device(config-router-lisp-site)# authentication-key k

Configures the password used to create the Hash-based Message Authentication Code (HMAC) Secure Hash Algorithm (SHA-1) hash for authenticating the map-register message sent by an egress tunnel router (ETR) when registering with the map server.

Step 6

eid-prefix eid-prefix accept-more-specifics

Example:

Device(config-router-lisp-site)# eid-prefix 10.1.0.0/16 accept-more-specifics

Configures a list of endpoint identifier (EID) prefixes that are allowed in a map-register message sent by an ETR when registering with the map server. Specifies that any EID prefix that is more specific than the EID prefix configured is accepted and tracked.

Step 7

exit

Example:

Device(config-router-lisp-site)# exit

Exits LISP site configuration mode and returns to LISP configuration mode.

Step 8

Repeat Step 4 to Step 7 to configure another LISP site.

—

Step 9

ipv4 map-server

Example:

Device(config-router-lisp)# ipv4 map-server

Configures a device to act as an IPv4 LISP map server.

Step 10

ipv4 map-resolver

Example:

Device(config-router-lisp)# ipv4 map-resolver

Configures a device to act as an IPv4 LISP map resolver.

Step 11

end

Example:

Device(config-router-lisp)# end

Exits LISP configuration mode and returns to privileged EXEC mode.

Configuration Examples for LISP ESM Multihop Mobility

Figure 3. LISP ESM Multihop Topology


The examples below show the complete configuration for the LISP topology illustrated in the figure above.

Example: First-Hop Router Configuration 


Device# configure terminal
Device(config)# router lisp
Device(config-router-lisp)# locator-set WestDC
Device(config-router-lisp-locator-set)# 172.16.1.2 priority 10 weight 50
Device(config-router-lisp-locator-set)# 172.17.2.3 priority 10 weight 50
Device(config-router-lisp-locator-set)# exit
Device(config-router-lisp)# eid-table default instance-id 0
Device(config-router-lisp-eid-table)# dynamic-eid VMs
Device(config-router-lisp-eid-table-dynamic-eid)# database-mapping 10.1.1.0/24 locator-set WestDC
Device(config-router-lisp-eid-table-dynamic-eid)# eid-notify 192.0.2.21 key k
Device(config-router-lisp-eid-table-dynamic-eid)# map-notify-group 224.0.0.0
Device(config-router-lisp-eid-table-dynamic-eid)# exit
Device(config-router-lisp-eid-table)# exit
Device(config-router-lisp)# exit
Device(config)# interface Vlan11
Device(config-if)# lisp mobility VMs
Device(config-if)# lisp extended-subnet-mode
Device(config-if)# ip address 10.1.1.2 255.255.255.0
Device(config-if)# standby 1 ip 10.1.1.1

Example: Site Gateway xTR Configuration 


Device> enable
Device# configure terminal
Device (config)# router lisp
Device(config-router-lisp)# locator-set WestDC
Device(config-router-lisp-locator-set) # 172.18.3.3 priority 10 weight 50
Device(config-router-lisp-locator-set)# exit
Device(config-router-lisp)# eid-table default instance-id 0
Device(config-router-lisp-eid-table)# database-mapping 10.1.0.0/16 locator-set WestDC
Device(config-router-lisp-eid-table)# dynamic-eid VMs
Device(config-router-lisp-eid-table-dynamic-eid)# database-mapping 10.1.1.0/24 locator-set WestDC
Device(config-router-lisp-eid-table-dynamic-eid)# eid-notify authentication-key k
Device(config-router-lisp-eid-table-dynamic-eid)# exit
Device(config-router-lisp-eid-table)# exit
Device(config-router-lisp)# ipv4 itr map-resolver 172.20.5.5
Device(config-router-lisp)# ipv4 itr
Device(config-router-lisp)# ipv4 etr map-server 172.20.5.5 key k
Device(config-router-lisp)# ipv4 etr
Device(config-router-lisp)# exit
Device(config)# interface FastEthernet1/4
Device(config-if)# ip address 192.0.2.21 255.255.255.0
Device(config-if)# lisp mobility VMs
Device(config-if)# lisp extended-subnet-mode

Example: xTR Configuration 


Device> enable
Device# configure terminal
Device (config)# router lisp
Device(config-router-lisp)# locator-set Site3RLOCS
Device(config-router-lisp-locator-set)# 203.0.113.2 priority 10 weight 50
Device(config-router-lisp-locator-set)# exit
Device(config-router-lisp)# eid-table default instance-id 0
Device(config-router-lisp-eid-table)# database-mapping 198.51.100.0/24 locator-set Site3RLOCS
Device(config-router-lisp-eid-table)# exit
Device(config-router-lisp)# ipv4 itr map-resolver 172.20.5.5
Device(config-router-lisp)# ipv4 itr
Device(config-router-lisp)# ipv4 etr map-server 172.20.5.5 key k3
Device(config-router-lisp)# ipv4 etr

Example: Map Server Map Resolver Configuration 


Device> enable
Device# configure terminal
Device (config)# router lisp
Device(config-router-lisp)# site EastWestDC
Device(config-router-lisp-site)# authentication-key k
Device(config-router-lisp-site)# eid-prefix 10.1.0.0/16 accept-more-specifics
Device(config-router-lisp-site)# exit
Device(config-router-lisp)# ipv4 map-server
Device(config-router-lisp)# ipv4 map-resolver

Additional References for LISP ESM Multihop Mobility

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Command List, All Releases

Locator/ID Separation Protocol (LISP) commands

Cisco IOS IP Routing: LISP Command Reference

Technical Assistance

Description

Link

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http://www.cisco.com/cisco/web/support/index.html

Feature Information for LISP ESM Multihop Mobility

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Feature Name

Release

Feature Information

LISP ESM Multihop Mobility

The LISP ESM Multihop Mobility feature separates the Locator/ID Separation Protocol (LISP) dynamic host detection function from the LISP encapsulation/decapsulation function within a LISP topology.