SPAN function issue

Unanswered Question
Aug 2nd, 2010
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There is backbone router A (7600s).It's interface connections:

- access switches

- IP uplinks

- other backbone routers

Router A is used also for:

- transit of customer's vlans from access switches to other backbone routers (where they are terminated)

- BGP with directly connected uplinks (and routing of user traffic to them also).

- terminate few customer vlans on SVI's.

The is a VSPAN configured on router A. The source for VSPAN are transit vlans and vlan's that are terminated on router A SVI's.

The destination for this VSPAN is an interface of router A connected with IDS.

The problem is that during BH (busy hours) delays and overrun mistakes increase on uplink interfaces of router A.

There is a strange corellation with vlans, that are terminated on SVI's. When I drop them from VSPAN process delays become normal and viсe versa.

Here is VSPAN part of configuration:

monitor session 1 source vlan 4 - 20 , 28 - 30 , 34 , 35 , 37 rx
monitor session 1 source vlan 57 - 58 rx
monitor session 1 destination interface GigabitEthernet1/3

Thanks, Alex.

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