Cat6500, VSS, mac address table empty

p.hruby · ‎05-31-2013

Today I noticed empty mac address table on our Cat6500 in VSS.

c6506_hto2_vss#sh mac address-table

Legend: * - primary entry

age - seconds since last seen

n/a - not available

vlan mac address type learn age ports

------+----------------+--------+-----+----------+--------------------------

MAC entries unavailable, please try later!

No entries present.

During the day this state changed to "almost empty" table:

c6506_hto2_vss#sh mac address-table

Legend: * - primary entry

age - seconds since last seen

n/a - not available

vlan mac address type learn age ports

------+----------------+--------+-----+----------+--------------------------

* 2246 0011.5d97.e400 static No - Router

* 2920 d8d3.855e.195a dynamic Yes 175 Po2

* 1530 0050.5600.2300 dynamic Yes 175 Po1

* 3414 0050.56b0.0151 dynamic Yes 175 Po1

* 3334 0050.568d.02d2 dynamic Yes 100 Po1

* 1550 0050.5645.85aa dynamic Yes 5 Po1

* 710 685d.43fa.14f5 dynamic Yes 320 Po302

* 756 0050.568f.0083 dynamic Yes 175 Po302

* 761 000b.fcfe.1b05 dynamic Yes 0 Te1/4/1

* 759 000b.fcfe.1b05 dynamic Yes 165 Te1/4/1

* 2926 78e7.d1b1.8096 dynamic Yes 30 Po2

* 710 0024.d698.1074 dynamic Yes 335 Po302

* 750 0017.a477.1066 dynamic Yes 175 Po302

* 1530 0050.5600.2253 dynamic Yes 175 Po1

* 794 0017.a477.0008 dynamic Yes 175 Po302

* 710 e006.e6c7.8915 dynamic Yes 175 Po302

MAC entries unavailable, please try later!

This state persists. CPU load is normal so I assume that switch has all MAC addresses in CAMs on its line cards.

The current situation complicates troubleshooting.

Anyone know how this could happen and how to fix it?

Petr

InayathUlla Sharieff · ‎05-31-2013

Hi Petr,

Indeed this is a bug. Unfortunately I cannot disclose this bug publically you can log a cisco tac case to get the bug details.

As a workaround you would need to make a reload on the vss

chassis and a down time will be required. We can also try to switchover to

the standby supervisor in order to check if the problem is with the current

active supervisor card itself.

HTH

Regards

Inayath

Reza Sharifi · ‎05-31-2013

What version of IOS are you running?

p.hruby · ‎06-01-2013

Cisco IOS Software, s72033_rp Software (s72033_rp-ADVIPSERVICESK9-M), Version 12.2(33)SXJ4, RELEASE SOFTWARE (fc2)

System image file is "sup-bootflash:s72033-advipservicesk9-mz.122-33.SXJ4.bin"

Petr

InayathUlla Sharieff · ‎09-16-2014

hruby,

please check pm.

p.hruby · ‎06-01-2013

Hi Inayath,

thanks for you valuable post. Could you plese send me the Bug ID by internal message?

Petr

Jan_Supka · ‎02-13-2018

Hello Inayath,

we have the same problem and we are interested in that bugID also. Is it possible to let us see bug details?
If so how can we access that information?

Best Regards

Jan Šupka