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CDP L2 Topology

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barryo edited this page Jun 20, 2012 · 3 revisions

This is a really useful tool. For a given CDP capable device as the root / start node, it will crawl through its CDP neighbours recursively to build up a L2 topology graph of your network.

The following image should illustrate this (with apologies for the necessary smudging):

Screenshot of CDP L2 Topology functionality

We, via an option on the NOCtools interface, chose to not split LAGs when generating this graph.

Similarly to CDP-Neighbours, this action uses the OSS_SNMP Cisco/CDP crawl() function and then linkTopology() to collapse the crawl data to single links.

See the Clustering Devices by Location section in CDP-RSTP-Port-Roles for a discussion on how to cluster the devices by location in the graphs.

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