Hi,
We recently installed a PtP link (2xcnWave V3000) between two buildings with 10Gbps uplinks to our Extreme Networks switches.
So far, the switches are not seeing each other. Extreme Networks uses Mac-in-Mac encapsulation along with SPBM to route the vlans across the backbone.
This requires an MTU of about 1900, which we think is supported, having read the documentation (although we do not see a configuration option for that).
We want to know if the transparent bridging implemented in the V3000 will support that. Our impression is that not all traffic is bridged but we would need a confirmation that we are trying to do is possible.
Hi Thierry Noel,
Would it be possible for you to share sample packet captures of your MAC-in-MAC encapsulation?
I plan to replay these in my lab setup (V3K to V3K) and would like to analyze them for further findings and suggestions.
Hi Prasanna, and thank you in advance for your help on this.
That being said, I suspect that our problem is more fundamental than that, since the Mac-in-Mac encapsulation isn’t used for the discovery.
For that, I think the switches just use Is-Is discovery (hello) frames, which are pretty normal broadcast/unicast frames. I am sending you an example.
As for the config, we enabled layer 2 bridging and left the SFP interfaces in transparent mode on both sides.
Actually, I am wondering if the VLAN encapsulation is preserved, because Is-Is discovery (and other processes) uses VLANs 1000-1001. Those are the vlans configured on the SFPs on our switches on both sides. I’ll try setting up the config manually and see what happens.
Yes, it expected to be preserved. The packet as is including vlan header should get transfered. By the way, the max size of 1928 should include the vlan headers