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Valery Denisov
Beginner

L3 switching

Hi there!

I have L3 switch which is cisco 4948. And configured SVI on it for example 1.1.1.1/24. So in port g1/1, which assigned to this svi, 

we connect our clients. They have a 1.1.1.1 as their default gateway. Also we have uplink which is trunk and another SVI for this connection for example 2.2.2.2/30. This trunk leads to network 10.20.0.0/24. So the question is - when we use debug ip packet with access-list point to 10.20.0.1 as destination in it we cant see in log packets destined to 10.20.0.1. Why it is so ?

3 REPLIES 3
cadet alain
Advisor

Hi,

Do you see any debug in your log ? what traffic is this? ( transit traffic from a pc or switch traffic)

Regards.

Alain

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Nope, there is nothing. It should be transit traffic. As i understand trafic destined to 10.20.0.1 should be routed via SVI for 1.1.1.1 then to 2.2.2.1(cuz on our side we have 2.2.2.2/30) which is other router connected through trunk.

Hi,

debug output only shows process switched traffic and so if you want to see CEF switched traffic you have to disable CEF

switching on your SVIs with no ip route-cache command

Also verify logging is on and enabled on console or terminal( monitor) with sh log command and don't forget to issue

privileged command terminal monitor to see logs when connected via line vty or auxiliary.

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.