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7600/Sup720. Huge traffic from fabric to Sup without active ports.

Hi !

7606/Sup720-3bxl/12.2(33)SRC4. A huge traffic is observed from fabric to Sup, but there are no active ports on Sup. What is the traffic ?

7606-3#sh platform hardware capacity fabric
Switch Fabric Resources
Bus utilization: current: 10%, peak was 21% at 04:46:20 MSK Sat Jun 12 2010
Fabric utilization:     Ingress                    Egress
Module  Chanl  Speed  rate  peak                 rate  peak
1       0        20G    0%   10% @08:15 16Mar10    2%   16% @16:51 15Mar10
4       0        20G   14%   49% @02:08 29Mar10   31%   52% @17:25 19Apr10
4       1        20G   34%   55% @21:47 03Jun10   13%   48% @02:08     Mar10
5       0         8G    0%    3% @02:06 19Feb10    0%    3% @14:30 12Feb10
6       0        20G    0%    2% @14:09 30Apr10   32%   52% @21:47 03Jun10
Switching mode: Module                                        Switching mode
                1                                                 compact
                4                                                 compact
                5                                                 compact
                6                                                 compact

It looks like all this traffic goes from slot 4 through fabric to Sup (slot 6). I thought it was multicast, but according to "show ip mroute count" multicast gets only 500-600Mbps.

According to "show mls statistics" there is a lot of L2 traffic. May be it`s "unknown MAC" traffic punted to Sup ? I can`t remember the command which can show counters for switched known/unknown MAC frames, something like "show mls..."

Thanks in advance,

Kirill

Everyone's tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: 7600/Sup720. Huge traffic from fabric to Sup without active

Hi,

Is there a monitor session (SPAN) configured on the switch ?

JayaKrishna

2 REPLIES
Cisco Employee

Re: 7600/Sup720. Huge traffic from fabric to Sup without active

Hi,

Is there a monitor session (SPAN) configured on the switch ?

JayaKrishna

New Member

Re: 7600/Sup720. Huge traffic from fabric to Sup without active

Hi Jayakrishna,
you were right - SPAN was the reason. Thanks a lot for help.

Best regards,
Kirill

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