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IPv6 Etherchannel : Workaround

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    Introduction

    IPv6 Etherchannel is not yet supported on Cisco IOS. Through this document we configure Layer 3 etherchannel between two switches, the two end points acts as GRE tunnel source and destination. IPv6 traffic is sent over GRE tunnel and hence using the bandwidth of Etherchannel.

    Prerequisite

    1. Understanding and Configuring Layer 3 Etherchannel
    2. IPv6 Routing Protocols

    Summary

    Router R1 and Switch SW1 are forming OSPFv3 peering. Router R1 is advertising its loopback prefixes to SW1 through IPv6 OSPF routing protocol. Further SW1 and SW2 partipate in IPv6 RIP routing protocol over the GRE tunnel. The tunnel end points are the IPv4 interface of the Port-Channel (PO13). On SW1, IPv6 mutual redistribution is performed between OSPFv3 and RIPng.

     

    The idea is to pass IPv6 traffic through Layer 3 Etherchannel.

     

    Hardware Incorporated

     

    Switch: Cisco C3750G Switch running IOS Version 12.2(44)SE5 (Advance IP Services)

    Router: Cisco C3845 series router running IOS Version 12.4(15)T14 (Advance IP Services)

    Topology Diagram

     

    New Topology Diagram.bmp

    Configuration

    SW 1SW 2

    Interface Tunnel13

      no ip address

      ipv6 address 2012:10::1/64

      ipv6 rip RIPING enable

      tunnel source 192.168.10.1

      tunnel destination 192.168.10.2

    Interface Port-channel13

      no switchport

      ip address 192.168.10.1 255.255.255.0

    Interface Tunnel13

      no ip address

      ipv6 address 2012:10::3/64

      ipv6 rip RIPING enable

      tunnel source 192.168.10.2

      tunnel destination 192.168.10.1

    Interface Port-channel13

      no switchport

      ip address 192.168.10.2 255.255.255.0

     

    For Complete Configurations, please see attached files.

    Verification

    On R1

    show ipv6 route

     

    R1-show ipv6 route.bmp

     

    On SW2

    ping ipv6 <destination> source <>

     

    SW2 - Ping.bmp

    References

    IPv6 Frequently Asked Questions (FAQ)

    Configuring Layer 3 Etherchannel

    Comments
    Cisco Employee

    As the layer 2 and 3 headers don't change, I'm not expecting a fair load-sharing over the links member of the bundle. L3 load-balancing may be a better approach here.

    My 2 cts

    Laurent.

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