On 28/02/13 18:10, [email protected] wrote:
Hello,

Is there dual stack support in any redundancy protocol
(HSRP/VRRP/GLBP) on the Catalyst 6500 with a Sup720 3BXL? If so,
which protocols are supported and beginning in what IOS releases?

Yes. HSRPv2 is supported in SXI releases (possibly earlier; read the release notes)

You need to toggle the standby version globally (which changes the HSRP vMAC).

int VlanX
  standby version 2
  standby 1 ip x.x.x.x
  standby 2 ipv6 autoconfig

Works fine.
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