Question about SPAN on Cat6500

Unanswered Question
Jan 17th, 2011

Hello everyone,

I have a question about SPAN on Cat6500 12.2(18)SXF9.

My customer gathered capture data on both physical interface (Gi3/24) and Vlan interface (Vlan210) on Cat6500 and Gi3/24 belongs to Vlan210.

Multicast routing (PIM) has configured on other Vlan than Vlan210 and multicast receivers exist on other Vlan than Vlan210. It means no PIM configured routers exist on Vlan210.

In this situation, my customer tried to configure the following command to gather capture data.

------------------------------
[Case 1]

Configured command

monitor session 1 source interface Gi3/24
monitor session 1 destination interface Gi3/21

Configuration of interface Gi3/24

interface GigabitEthernet3/24
switchport
switchport access vlan 210
switchport mode access
no ip address

Result

PIM packets on other Vlan than Vlan210 were captured on interface Gi3/24 but IGMP packets and actual multicast streams were not captured.
Only PIM packets on other Vlan were captured.
Captured PIM packets (destined to 224.0.0.13) sourced from other than 10.1.0.0/16 network (Vlan210) such as 131.2.111.3, 150.200.1.3 ...

[Case 2]

Configured command

monitor session 1 source Vlan210
monitor session 1 destination interface Gi3/21

Configuration of interface Vlan210

interface Vlan210
ip address 10.1.1.1 255.255.0.0
ip broadcast-address 10.1.255.255
no ip redirects
no ip unreachables

Result

PIM packets on other Vlan than Vlan210 were NOT captured on interface Vlan210.
------------------------------

I think Case 1 seems like abnormal behavior and PIM packets on other Vlan than Vlan210 should not be captured on Gi3/24 which belongs to Vlan210 and Case 2 is expected behavior.

Would you have similar experience and/or any advise?

Your information would be appreciated.

Best regards,

Shinichi

I have this problem too.
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Posted January 17, 2011 at 9:04 PM
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