Problem Configuration With Cisco 3750x L3 Switch

[moutaz101]

-  i configure vlans and inter-vlan routing and its working well.
- i  configure default route to pass the packets to another interface ( no switchport , ip address and route are configured)

the problem now that :
-from the 3750x router itself; i can reach the new destination

- but from other vlans i cannot reach the new destination 

how i can solve this?

[Jon Marshall]

The default route next hop device needs routes back to those vlans/IP subnets.

Does it have these ?

If not either statics on the next hop device or a dynamic routing protocol between the 3750 and the next hop device is needed.

Jon

[moutaz101]

The next hop router is related to ISP Provider and can not be configured from our side.
 

[Martin Hruby]

Hello

As Jon pointed out, your next-hop router must have a route back to reach your VLANs. If it does not, then configuring NAT and translating their IPs to the IP of the Catalyst switch (outgoing interface towards the next-hop) would solve the issue, unfortunately NAT is not supported on the 3750-X.

Best option would be to request a logical change of configuration from your ISP and either configure static routes on their router which would allow it to reach back your VLANs or setup a dynamic routing protocol.

Best regards,
Martin