Mgmt VLAN not accessible, but ISIS established

[TobiasW]

Hi all,

After an blackout on saturday, I have a very confusing phenomenon on one of my ERS4850. The Switch has active ISIS Adjacencys, but I cannot ping the Mgmt IP Adress, nor can the Switch ping any device inside the Fabric.

The Mgmt VLAN ISID is correct, and the IP is assigned to the correct Mgmt VLAN.

I disconnected the Uplinks to my VSP Cores, and rebooted the system, so that the ISIS LSDB is empty. If I connect one of the Uplinks, the Adjacency comes up, and the LSDB fills up with every information I’d think of have to be there. Even a L2 Ping through the Backbone VLANs started on the VSP is sucessful, but I can’t ping the Mgmt IP Adress…

Does anyone have a hint for me, or something I can try to troubleshoot this?

Or may it just be a hardware defect after the blackout?

Thanks and Best Regards,

Tobias

[TobiasW · Accepted solution]

Hi Mig,

yes, you’re right, the ERS is using fabric connect.

The ERS Software is 5.12.0.55.

Yes, I’ve tried to switch the uplinks, but without any positive effect.

I thing I’m going to create an RMA Case in GTAC for exchange of the system. There was no change exept for the blackout, so the unit may simply got broke…

However, thanks, and best regards

[Miguel-Angel_RO]

Hi Tobias,

I understand from you description that you are using fabric connect on the ERS.

What are the SW version of ERS/VSP?

Did you tried to swap the two uplinks? It sounds weird but I’ve seen some issues with specific topologies and old firmwares.

Mig