[c-nsp] Equal Cost Routing w/ 3550

Hector Herrera mail4hh at pobox.com
Wed Nov 2 23:05:15 EDT 2011


I'm using a 3550-12t with routed ports.  Two of the ports are
configured with the default route like this:

ip route 0.0.0.0 0.0.0.0 Gig 0/1 <ip of remote router1>
ip route 0.0.0.0 0.0.0.0 Gig 0/2 <ip of remote router2>

'show ip route 0.0.0.0' indicates:

Routing entry for 0.0.0.0/0, supernet
  Known via "static", distance 1, metric 0, candidate default path
  Routing Descriptor Blocks:
  * <ip of remote router1>, via GigabitEthernet0/1
      Route metric is 0, traffic share count is 1
    <ip of remote router2>, via GigabitEthernet0/2
      Route metric is 0, traffic share count is 1

My first sign of trouble is that the '*' fails to switch back-n-forth
between the two available routes.

All traffic is directed to the interface with the '*' and it never
changes.  The second interface has zero outgoing traffic.

Both links show incoming traffic from the remote routers.

This was working before until I moved my equipment to another cabinet
with new links (and new IP addresses and possibly different routers at
the remote end).

So ... what are my symptoms:

a) no outgoing traffic on one interface
b) users complain of sporadic connectivity issues, slow network access

I have posted the output from some troubleshooting commands here:

http://www.hectorh.com/cisco-output.txt

Thank you for your help!

-- 
Hector Herrera


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