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

Attention: The Community will be in read-only mode on 12/14/2017 from 12:00 am pacific to 11:30 am.

During this time you will only be able to see content. Other interactions such as posting, replying to questions, or marking content as helpful will be disabled for few hours.

We apologize for the inconvenience while we perform important updates to the Community.

New Member

Nexus 7000 - Adjacency table exhausted

Hi Experts,

Please give us some suggestions. I'm running a couple N7K as campus's core. Separate two LC on each box to TWO VDC e.g. Backbone & Wireless VDC. Wireless VPC is paring to 4 WLC, 2 links each. Between N7K and WLC running in layer 2 mode. We serve both IPv4 & IPv6.


Problem is one day on last week, the first day of university's semester. The N7K goes corrupt. After along while troubleshooting we found that due to this logs

N7K1 %IPFIB-SLOT4-4-CLP_FIB_ADJ_EXHAUSTED: Adjacency allocation failed on instance 6


We have tested for how adjacency table being accumulated. Then we found the following captured picture.


What I did wrong? It seem like N7K F2e Line-card be able to hold only 10,000+ MAC address (host)?


Please give us some suggestions.

Nipat CCIE#29422


New Member

The F2e cards can only

The F2e cards can only support 16K MAC addresses per SoC (Switch on a Chip) and a total of 16K ARP entries total.  The command "show hardware capacity forwarding" will show you the complete picture for layer 2.   That's why we now have 7706s with F3 cards.

CreatePlease to create content