Troubleshooting an Extended Edge Switching Topology

The following information provides tips on how to verify and troubleshoot your Extended Edge Switching topology.

Commands for Verifying/Troubleshooting Extended Edge Switching Topology

Use the following commands to verify and troubleshoot the Extended Edge Switching topology:

show configuration {module-name} {detail} with vpex as the module-name—shows cascade port configuration.
show configuration {module-name} {detail} with vlan as the module-name—shows LAG configuration.
show configuration {module-name} {detail} with devmgr as the module-name—shows slot module type configuration.
show vpex—shows mapping between cascade port and slot number.
show slot {slot {detail} | detail }—shows status of BPE slot.
show vpex ports ports_list—shows the status of the CSP control plane connections for each cascade port.

The following limitations apply when using automation to set up an Extended Edge Switching topology.

Limitation	Workaround
Configured BPEs cannot be moved from one port to another port. Auto-configuration does not re-detect the BPEs.	Do one of the following: Reconnect the BPE to the original port. Manually remove LAG/MLAG/cascade configuration on the original port. Save the configuration. Reboot the switch, and allow auto-configuration to discover the BPE on the new port.
Auto-configuration does not reliably work on a port if there is any configuration present on that port (cascade port, LAG, or MLAG configuration). If there is LAG/MLAG/cascade configuration on a port, auto-config may not be able to detect the BPE connected to the port.	Disable auto-configuration. Manually remove LAG/MLAG/cascade configuration on the port. Re-enable auto-configuration.

To verify and troubleshooting the MLAG setup, use the following commands:

show mlag peer {peer_name}—shows if MLAG peer is up.

show configuration {module-name} {detail} with vsm as the module-name—shows MLAG port configuration.

The following limitations apply when using automation to set up redundant CBs.

Limitation	Workaround
If the CB has MLAG peer configuration, but its MLAG peer is down, you cannot enable auto-configuration.	Remove the MLAG peer configuration to make it a single CB setup. Bring up the MLAG peer.
If a BPE is configured before MLAG peer is configured, auto-configuration does not configure the MLAG port for the previously configured BPE.	Manually configure MLAG port for the previously configured BPE by setting the MLAG port ID to 5000 plus the BPE‘s slot number.

Published March 2020prev | next