intervlan routing multilayer switch C3750

[eezergeezer]

Hello Guys,

I have a router >>>connected to a c3750 >>> connected to a customer switch..

Router ip Gi01 : 172.31.102.6/24

|

|

c3750

port Gi01= vlan 70 svi: 172.31.102.7/24

port Gi06= vlan 72 svi:  10.1.155.33/28

|

|

customer switch (cisco unknown device)

port GiX =vlan XX svi: 10.1.155.34/28

I have the following routes:

Router:

ip route 10.1.155.32/28 via 172.31.102.7

switch:

ip route 10.1.155.32/28 via vlan 72

I can ping the customer 10.1.155.34 ip from the switch.

I cannot ping the 10.1.155.34 from the router..

What am i missing here? Would I need to create a sub int on the router to reach the customer 10.1.155.34 address?

trace route 10.1.155.34

Tracing the route to 10.1.155.34

  1 172.31.102.7 0 msec 0 msec 4 msec
  2  *  *  *
  3  *  *  *

Please help .. Am I doing something totally wrong here?

thanks in advance...

[mrdogantr]

Hi,

    Did you have activate ip routing on c3750sw with "ip routing" command.

hth

Muammer

[eezergeezer]

Yes, ip routing is enabled.

no aaa new-model
switch 1 provision ws-c3750g-12s
system mtu routing 1500
vtp mode transparent
ip subnet-zero
ip routing             <<<<<<<<<<<<<<<<<<<<--------
no ip domain-lookup

I should be able to route between vlans...

bit more info

If i ping directly from the switch:

ping 10.1.155.34  all is ok

if i extended ping using the source as 172.31.102.7 i cannot ping..

[Alvaro Garcia · Accepted solution]

It seems that your customer's switch is getting a ping request witha  source address of 172.31.102.6 but it doesnt know how to reach 172.31.102.6....

so I would say that you need to make sure that the customer's switch has a route (static or dinamic) pointing to your 3750 switch, or configure the deafult gateway of your customer's switch to point to 10.1.155.33...

You dont need this on the 3750 switch:

ip route 10.1.155.32/28 via vlan 72

This because it is already on the routing trable because it is a directly connected route.

[eezergeezer]

Thanks Guys,

The problem was a missing route at the customer end. I always second guess myself before pushing to the customer. Just needed some verification from the gurus here!