A VLAN topology shows the spanning tree that a given VLAN uses on the network. Only VLANs with a spanning tree root that is managed by NetMRI can be viewed in the appliance. VLANs can have identical names as long as the root bridge is different.
To display a VLAN topology:
- In the categories folders, click Vlans.
- Select the VLAN you are interested in.
In the resulting topology chart, the root bridge is displayed at the top and the leaf nodes are displayed below. Active and disabled links are indicated in the graph. The farther the distance from the root bridge, the higher the cost in the L3 VLAN path. Spanning tree port blocking is indicated by a gray X at the end of a connection. If a port shows an error, it is indicated by a red X.
Note: Pre-defined topologies are synchronized on schedule, but some Topology Viewer functionality is based on information obtained through NetMRI API in real time. This may lead to some discrepancy in the display of VLAN graphs, as Topology Viewer gets VLAN data is real time, but draws them based on L2 topology data previously synchronized to the database.