EIGRP IWAN Simplification

EIGRP is widely deployed on DMVPN networks. The EIGRP IWAN Simplification feature implements stub site behavior for EIGRP deployed on DMVPN networks.

Information About EIGRP IWAN Simplification

Stub Site ID Configuration

The EIGRP Stub Routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration on the spoke. EIGRP Stub routing is commonly used over DMVPN networks having multiple sites with single device in each site. Site devices acting as stub result in reducing the query domain thereby enhancing improved performance. On the other hand, branch EIGRP routing is simple for a single router default-gateway site. When a the branch adds a second router or becomes larger and needs routing within the campus the configuration becomes complex.

The EIGRP IWAN Simplification feature implements stub site behavior on devices that are connected to the WAN interfaces on branch routing via the configuration of stub site ID on EIGRP address family. Use the eigrp stub-site command in the address family configuration mode. The stub site ID is applied to all incoming routes on WAN interfaces.


Note

The eigrp stub-site command is mutually exclusive with the eigrp stub command. You cannot execute both commands on a device. This eigrp stub-site command resets the peers on WAN interfaces and initiates relearning of routes from WAN neighbors.

Interfaces connected towards hub or WAN are identified so that routes learnt through neighbors on such interfaces are part of a list of a given route. This is achieved via the stub-site wan-interface command configured in the address family interface configuration mode.


Note

On the identified interfaces, neighbors treat WAN interfaces as stub.

How to Configure EIGRP IWAN Simplification

Configuring the Stub Site ID

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. router eigrp virtual-instance-name
  4. Enter one of the following:
    • address-family ipv4 [multicast ] [unicast ] [vrf vrf-name ] autonomous-system autonomous-system-number
    • address-family ipv6 [unicast ] [vrf vrf-name ] autonomous-system autonomous-system-number
  5. network ip-address [wildcard-mask ]
  6. stub-site wan-interface
  7. end
  8. show ip eigrp vrf vrf-name topology [ip-address [mask]]

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 eigrp virtual-instance-name

Example:

Device(config)# router eigrp virtual-name1

Enables an EIGRP routing process and enters router configuration mode.

Step 4

Enter one of the following:

  • address-family ipv4 [multicast ] [unicast ] [vrf vrf-name ] autonomous-system autonomous-system-number
  • address-family ipv6 [unicast ] [vrf vrf-name ] autonomous-system autonomous-system-number

Example:

Device(config-router)# address-family ipv4 autonomous-system 45000
Device(config-router)# address-family ipv6 autonomous-system 45000

Enters address family configuration mode to configure an EIGRP IPv4 or IPv6 routing instance.

Step 5

network ip-address [wildcard-mask ]

Example:

Device(config-router-af)# network 172.16.0.0

Specifies the network address of the EIGRP distribution device.

Step 6

stub-site wan-interface

Example:

Device(config-router-af-interface)# stub-site wan-interface

Specifies a stub site for the WAN interfaces.

Step 7

end

Example:

Device(config-router-af-interface)# end

Exits the address family interface configuration mode and returns to privileged EXEC mode.

Step 8

show ip eigrp vrf vrf-name topology [ip-address [mask]]

Example:

Device# show ip eigrp vrf vrf1 topology 109.1.0.6/32

Displays VPN routing and forwarding (VRF) entries in the EIGRP topology table.

Example

The following is a sample output from the show ip eigrp vrf topology command 

Device# show ip eigrp vrf vrf1 topology 109.1.0.6/32

EIGRP-IPv4 Topology Entry for AS(1)/ID(109.1.0.2) VRF(vrf1)
EIGRP-IPv4(1): Topology base(0) entry for 109.1.0.6/32
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2713600
  Descriptor Blocks:
  104.1.1.58 (Tunnel1), from 104.1.1.1, Send flag is 0x0
      Composite metric is (2713600/1408256), route is Internal
      Vector metric:
        Minimum bandwidth is 100000 Kbit
       Total delay is 105000 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 200
        Hop count is 2
        Originating router is 109.1.0.6
      Extended Community: StubSite:101:100

Configuration Examples for EIGRP IWAN Simplification

Example: Configuring the Stub Site ID 

Device> enable
Device# configure terminal
Device(config)# router eigrp virtual-name1
Device(config-router)# address-family ipv4 autonomous-system 45000
Device(config-router-af)# network 172.16.0.0
Device(config-router-af)# eigrp stub-site 101:100
Device(config-router-af)# af-interface gigabitethernet 0/0/1
Device(config-router-af-interface)# stub-site wan-interface
Device(config-router-af-interface)# end

Additional References for EIGRP IWAN Simplification

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Command List, All Releases

EIGRP commands

Cisco IOS IP Routing: EIGRP Command Reference

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

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

Feature Information for Overview of Cisco TrustSec

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.
Table 1. Feature Information for Overview of Cisco TrustSec

Feature Name

Releases

Feature Information

IPv6 enablement - Inline Tagging

Cisco IOS XE Fuji 16.8.1

The support for IPv6 is introduced.