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IP secondary addresses and Dot1q subinterfaces

Is it possible to configure ip secondary addresses on a dot1q sub interface??

ie

int fa0/0.1

ip address x.x.x.x y.y.y.y

ip address z.z.z.z y.y.y.y secondary

Will these secondary address suffer the same split horizon issues as when on a standard int ???

1 REPLY

Re: IP secondary addresses and Dot1q subinterfaces

Might depend on the router but should be yes though. And it will have the same issue as a standard interface. See link on split horizon and some routing protocols: http://www.cisco.com/warp/public/105/41.html.

For eigrp: If an interface is configured with secondary IP addresses and split horizon is enabled, updates might not be sourced by every secondary address. One routing update is sourced per network number unless split horizon is disabled.

Hope it helps.

Steve

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