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Community Member

layer 2 or layer 3 issue ? (diagram added)

Hi everybody,

in order to connect a LAN to 02 redundant routers like the attached diagram, the question is when the port Gi0/1 in 2960 switch is active and Gi0/2 is blocked, all the 03 devices are reachable (respond to ping) and traffic goes through, but when port Gi0/1 is DOWN and the port Gi0/2 is active, the routers are not rechable from 2960 switch and no traffic is possible between switch and routers.

any suggestions ?

thanks.

5 REPLIES
Community Member

Re: layer 2 or layer 3 issue ? (diagram added)

You would need to set a virutal IP address for the two routers

e.g.

interface vlan 300

ip address 192.168.12.3

standby ip 192.168.12.1

This would create a virtual router which you then point the clients towards if either router fails the HSRP protocol will readvertise the address out the other router.

Re: layer 2 or layer 3 issue ? (diagram added)

As posted above you need a gateway redundancy protocol like HSRP to work

Have a look at this link

http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_12c_ea1/configuration/guide/swhsrp.html

HTH

Narayan

Community Member

Re: layer 2 or layer 3 issue ? (diagram added)

happy new year !

i have configured HSRP between the two routers, but the problem is always the same,

any idea.

thanks.

Hall of Fame Super Blue

Re: layer 2 or layer 3 issue ? (diagram added)

Hi

Can you post configs of 2 routers and the switch.

Also when you configured HSRP did you make the default-gateway on the switch point to the Virtual IP address you configured under HSRP ?

Jon

Community Member

Re: layer 2 or layer 3 issue ? (diagram added)

Hi jon,

you can find the configurations in the attached file.

BR,

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