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. And see here for current known issues.

New Member

Mac addressing not learned

Hi, we have a Nexus 5548 in our test/dev environment, but for some reason it isn't learning Mac Addresses. If I submit a "show mac address-table", bothing comes back. We have about 20 nodes on the switch. Should be coming back with something. This is a typical config, nothing fancy. It does have spanning-tree rspd and portfast on the ports. The trunks only allow 2 Vlans.

Can you help explain some reasons why the mac address are not showing? Thanks

2 REPLIES
Green

Mac addressing not learned

Chris,

Only a suggestion but can you look at the mac aging timer

show mac-address-table aging-time

The default is 300 secs (5 mins) but may be it has been set to 0

!

mac-address-table aging-time 300

!

will set the default

Worth a look.

Regards,
Alex.
Please rate useful posts.

Regards, Alex. Please rate useful posts.
New Member

Mac addressing not learned

Yeah, thanks, but it's already set to default:

cos-qa-ror10ge03# sho mac address-table aging-time

Vlan  Aging Time

----- ----------

112   300

1     300

154
Views
0
Helpful
2
Replies
CreatePlease login to create content