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Dual stack hsrp on 3560

vikranT_PATKAR
Level 1
Level 1

forgive me if the question has already been answered,i tried searching but coudnt get a definitive answer.

the query is does 3560 with lattest ios, support hsrp for ipv4 and ipv6 simultaneously on same SVI { AFAIK it doesnt }

in case it doesnt what could be the best practice that provides high availability

we are planning to run dual stack on our network

           

                 

we have 4 3560 switches and we are using hsrp for ipv4

1.C1,C2 provide hsrp gateway to D1 D2               

2.D1,D2 provide hsrp gateway to C1,C2                

3.D1,D2 provide hsrp gateway to hosts

            ------------          ------------

           |           |          |            |

           |    C1   |----------|    C2    |

           | 3650   |          |   3650  |

           ------------          ------------

             |      \  hsrp   /     |

             |       \         /      |

             |        \       /       |

             |         \     /        |

             |          \   /         |

             |           \ /          |

             |            \           |

             |           / \          |

             |          /   \         |

             |         /     \        |

             |        /       \       |

             |       /         \      |

             |      /   hsrp   \    |

        ------------            ------------

        |            |           |            |

        |    D1    |           |     D2   |

        |  3650   |           |    3650 |

        ------------            ------------

             |         hsrp           |

             |------------------------|

                 |     |     |     |

                [ ]   [ ]   [ ]   [ ]

                        hosts

we would have prefered if we could implement the same in ipv6

but incase we cant run hsrp for ipv4 and ipv6 simultaneously on same SVI

what will be the best practice out of following scenarios to run ipv6

we wont be touching the existing ipv4 network.

1 igp between C1,C2,D1,D2 block  and using NUD to provide first hop redundancy at host level

{number of routes are less than 100}

2 static routing between C1,C2,D1,D2 block  and using NUD to provide first hop redundancy at host level

in this case is it possible to use ip sla tracking

3 any other approach that i might have missed

      

regards,

4 Replies 4

Deepak Ambotkar
Level 1
Level 1

Hi Vikrant,

It should work with latest IOS. What IOS are you using?

Just some basic questions-

Have you enabled IPv6 stack on the switch (sdm prefer dual-ipv4-and-ipv6)?

Have you enabled IPv6 routing on the switch (ipv6 unicast-routing) ?

Also you may wanna configure HSRP version (2) under the interface.

Please refer to the link below for your reference:-

https://supportforums.cisco.com/videos/2829

Regards,

Deepak Ambotkar

thanks for the reply

IOS c3560 Kadvancedipservices K9-M              12.2(46)SE

ipv6 hsrp is working in standalone mode

the problem is when hsrp is configured for ipv4 and ipv6 simultaneously on same interface vlan {with different group no}only one of those work.

Hi Vikrant,

Looks like its not supported even in the latest version (15.0(2)) - see here:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/15.0_2_se/configuration/guide/swhsrp.html#wp1093570

From the link:

If you configure HSRP for IPv4 and HSRP for IPv6 at the same time the switch will throw the following error:

%FHRP group not consistent with already configured groups on the switch stack - virtual MAC reservation failed

Work around:  Configure either HSRP for IPv4 or HSRP for IPv6 on the switch.

I'm not sure if this is a hardware or software limitation.  If I find out I'll post it here.

--Jim