4507 is not using the default route !!!

[Ali Koussan]

Hi ,

I have the setup shown in the attached drawing , I dont know why SWITCH_A is not using the default route .

when I try to ping any subnet behind SWITCH_B , SWITCH_A cannot reach it if I didnot specifically add a static route to that subnet pointing to switch_B

ip route 10.12.217.0 255.255.255.0 10.12.223.253 !!!

SWITCH_A routing table is:

Gateway of last resort is 10.12.223.254 to network 0.0.0.0

10.0.0.0/8 is variably subnetted, 31 subnets, 4 masks

C 10.12.223.252/30 is directly connected, GigabitEthernet3/6

C 10.12.220.0/24 is directly connected, Vlan220

C 10.12.218.0/24 is directly connected, Vlan218

C 10.12.216.0/24 is directly connected, Vlan216

C 10.12.217.0/24 is directly connected, Vlan217

S* 0.0.0.0/0 [1/0] via 10.12.223.254

Can anyone explain this behavior !!!

[Jon Marshall · Accepted solution]

Okay, so when you run a ping from switch A are you making sure that it is from an interface in either from int vlan 216 or 218 as these are the only 2 networks switch B knows how to get back to.

Jon

[John Blakley]

You'll need to add a route for every network that's on switch A to switch B if you're not using eigrp between them for A to see the return traffic back.

So whatever VLANs you need to get to on switch A from B, you'll need a static route for on the B switch.

--John

[John Blakley]

I rated you; good catch Jon. :-)

--John