Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

CDP nei results and Flex Connect AP vlan mapping behavior

Hi all,

    We're running controller code 7.4.100.108 and PRIME version 1.3.

    Occassionally, usually as the result of some networking event that causes flex connect AP's to lose connectivity to their controller, the flex connect AP's lose their vlan mapping configuration when they reconnect to their home controller.

    We "think" we have noticed that the cdp nei results are different for AP's that have proper vlan mappings from those that have lost their mappings.  For example, in the below example, only AP's 8213 and 8219 have lost their vlan mapping configs (all the AP's below are flex connect):

8107   Gig 1/0/45        177           R T      AIR-LAP11 Gig 0

8106   Gig 1/0/44        163           R T      AIR-LAP11 Gig 0

8216   Gig 1/0/47        136           R T      AIR-LAP11 Gig 0

8213   Gig 1/0/48        135           R T      AIR-LAP11 Gig 0.2

8219   Gig 1/0/46        159           R T      AIR-LAP11 Gig 0.2

8109   Gig 2/0/48        153           R T      AIR-LAP11 Gig 0

...and when the vlan mapping is fixed:

8107   Gig 1/0/45        177           R T      AIR-LAP11 Gig 0

8106   Gig 1/0/44        163           R T      AIR-LAP11 Gig 0

8216   Gig 1/0/47        149           R T      AIR-LAP11 Gig 0

8213   Gig 1/0/48        149           R T      AIR-LAP11 Gig 0

8219   Gig 1/0/46        152           R T      AIR-LAP11 Gig 0

8109   Gig 2/0/48        153           R T      AIR-LAP11 Gig 0

     I've done some reading to try to understand the details of the "Port ID" field of cdp neighbor with AP's but haven't found my answer.  I want to know what the significance of the difference between "Gig 0" and "Gig 0.2" is.

     I'm going to lab up an AP and see if I can replicate the behavior and confirm that it is related to the vlan mapping, but haven't gotten to it yet.   If anyone can point me to the nuts/bolts behind that sublte change in "Port ID" it'll help.

     By the way, I'm interested in this problem so that I can quickly identify which of my hundreds of flex connect AP's have lost their vlan mappings after a network disruptive event.  I can't find an interesting report in PRIME that will let me see it quickly.  So if a scriptable cdp nei command could identify the problem as well, that would be interesting.

     Thanks in advance for the help.

451
Views
0
Helpful
0
Replies