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Mac addressing not learned

jclj
Level 1
Level 1

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 2

acampbell
VIP Alumni
VIP Alumni

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.

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

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