03-25-2010 07:37 AM - edited 03-06-2019 10:18 AM
I'm reviewing some configs that were done before I got here. I had a quick question on storm-control that I've never been sure about. The command "storm-control action trap"... does that just generate traps when passing the threshold levels, or does it filter too? I've seen posts in doing searches that say that it's trap only, and some that say filter and trap. Could it be different for different models and IOSes?
Thanks!
Solved! Go to Solution.
03-25-2010 01:15 PM
Storm Control always does filtering, even if you don't have the "trap". "trap" will do bother filtering and send SNMP traps.
You can verify the operating using the "show storm-control" command and looking at the interface status. For example:
interface FastEthernet0/1
storm-control multicast level 50.00
!
Before Storm:
switch#show storm-control multi
Interface Filter State Trap State Upper Lower Current Traps Sent
--------- ------------- ------------- ------- ------- ------- ----------
Fa0/1 Forwarding inactive 50.00% 50.00% 0.00% 0
As Storm builds:
switch#show storm-control multi
Interface Filter State Trap State Upper Lower Current Traps Sent
--------- ------------- ------------- ------- ------- ------- ----------
Fa0/1 Forwarding inactive 50.00% 50.00% 41.48% 0
After Filtering kicks in:
switch#show storm-control multi
Interface Filter State Trap State Upper Lower Current Traps Sent
--------- ------------- ------------- ------- ------- ------- ----------
Fa0/1 Blocking inactive 50.00% 50.00% 75.68% 0
What I'm not sure about is if in "Blocking" state, if it blocks all packets or only a certain percentage.
03-25-2010 12:58 PM
Hi,
According to the command reference guide this command sends an SNMP trap:
HTH
Reza
03-25-2010 01:14 PM
Yes, that's true, but that's not quite what I was asking. Obviously, using this command a trap is sent when a threshold is passed. What I'm trying to figre out is, one of the following two cases is true:
- a trap is sent and filtering IS done
- a trap is sent and filtering IS NOT done
I've ran across this link and couldn't be certain from what I read.
03-25-2010 01:15 PM
Storm Control always does filtering, even if you don't have the "trap". "trap" will do bother filtering and send SNMP traps.
You can verify the operating using the "show storm-control" command and looking at the interface status. For example:
interface FastEthernet0/1
storm-control multicast level 50.00
!
Before Storm:
switch#show storm-control multi
Interface Filter State Trap State Upper Lower Current Traps Sent
--------- ------------- ------------- ------- ------- ------- ----------
Fa0/1 Forwarding inactive 50.00% 50.00% 0.00% 0
As Storm builds:
switch#show storm-control multi
Interface Filter State Trap State Upper Lower Current Traps Sent
--------- ------------- ------------- ------- ------- ------- ----------
Fa0/1 Forwarding inactive 50.00% 50.00% 41.48% 0
After Filtering kicks in:
switch#show storm-control multi
Interface Filter State Trap State Upper Lower Current Traps Sent
--------- ------------- ------------- ------- ------- ------- ----------
Fa0/1 Blocking inactive 50.00% 50.00% 75.68% 0
What I'm not sure about is if in "Blocking" state, if it blocks all packets or only a certain percentage.
03-25-2010 01:22 PM
Here's same situation but with trap:
interface FastEthernet0/1
storm-control multicast level 50.00
storm-control action trap
!
switch#show storm-control multicast
Interface Filter State Trap State Upper Lower Current Traps Sent
--------- ------------- ------------- ------- ------- ------- ----------
Fa0/1 Blocking Above falling 50.00% 50.00% 75.93% 3
03-25-2010 01:26 PM
OK... that's what I kind of suspected, but I wanted to make sure...
Thanks for the replies!
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