Cisco – IPv6 address assigned to vlan interface of 3750 switch changes

ciscocisco-3750interfaceip addressipv6

When setting up my 3750 stacks, I enable IPv6 on the Vlan1 interface so that I can manage the stack over IPv6. The stacks are not doing any layer 3 routing. However, it seems that the IPv6 address that gets automatically assigned changes if a different switch becomes the stack master, presumably because the mac address of the vlan interfaces changes as well. Other than manually assigning an IPv6 address, is there a way to prevent this annoying behavior?

Best Answer

You need to enable the 'Persistent MAC-Address' feature of the 3750 with the stack-mac persistent timer 0 command. There is no way to assign a virtual mac-address to a 3750 stack.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swstack.html#wp1206500