Published On: August 6ᵗʰ, 2019 02:03

IP Routing: EIGRP Configuration Guide, Cisco IOS XE Release 3S

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

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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. eigrp stub-site

7. af-interface {default | interface-type interface-number}

8. stub-site wan-interface

9. end

10. 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 eigrp stub-site


Example:
Device(config-router-af)# eigrp stub-site 101:100
 

Specifies a stub site for the address family in the following formats:

  • ASN:nn

  • IP-address:nn

  • 4BASN:nn

  • aa:nn

 
Step 7 af-interface {default | interface-type interface-number}


Example:
Device(config-router-af)# af-interface gigabitethernet 0/0/1
 

Enters address family interface configuration mode and configures interface-specific EIGRP commands.

 
Step 8 stub-site wan-interface


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

Specifies a stub site for the WAN interfaces.

 
Step 9 end


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

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

 
Step 10 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.

 

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

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Feature Information for EIGRP IWAN Simplification

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 EIGRP IWAN Simplification

Feature Name

Releases

Feature Information

EIGRP IWAN Simplification

Cisco IOS XE Release 3.16S

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

The following commands were introduced by this feature: eigrp stub-site, stub-site wan-interface, show ip eigrp.