Cisco SG300-28 Trunking between Layer3 and Layer2

[edmahadeo]

Hello Support community, 

I have a peculiar issue with some new Cisco SG300's and I wonder if anyone has any insight on this. It's a basic setup of one layer 3 SG300-28 trunked via an EPL to a Layer 2 SG300-28.

There are three VLAN's, VLAN1, 10, 20. The trunk port is allowing all.

From the Layer 2 switch trunk port I can ping all VLAN IP's on the Layer 3 switch, and visa versa.

From the Layer 2 switch trunk port I can ping two host IP's located on VLAN 10 of the Layer 3 switch. However, from the Layer 2 switch, I cannot ping hosts located within the same VLAN 10 on the same layer 2 switch. Nor can a host located within the Layer 3 switch within VLAN 10 ping any hosts within the Layer 2 switch on the same VLAN 10.

I replicated this setup on a cisco 2950 trunked to a 3550 (local cross-over cable trunk), and I could ping hosts perfectly fine.

I have attached the config files of both switches. Any ideas?

[Reza Sharifi]

Hi,

Not familiar with this type of switch but

 "bridge multicast mode ipv4-group" 
is missing from vlan 10 interface.

Not sure if this makes any difference.

HTH

[amikat]

Hi,

As your configs do not show any GVRP configuration my view is that you have created vlans at both boxes in the static way. If this is the case the vlan configurations at both ends would show discrepancy as for the vlan 10 name (you can check via the "show vlan" command at both boxes).

Can you please try to add the "name data" under "interface vlan 10" at L3 or delete the same line at L2 and then see if there is any progress.

Best regards,

Antonin

[edmahadeo]

Thank you both for responding. I found my error. I mistakenly thought that I had both vlan 10 and 20 configured within my trunk ports, however only vlan 20 was. After adding vlan 10, voila, it works on all trunks.

Thank you both again...