Without "ip multicast-routing", switch in high CPU loading

[osw200051]

Hi All,

I faced a case with switch high CPU usage, around 70 %. Case had solved after I issued "ip multicast-routing"  command.

The following is the background.

There are about 10 SVI interface with "ip pim sparse-dense-mode" on this switch (Core).

But I forgotten to issue "ip multicast-routing" at the beginning.

But my question is: Why this switch without "ip multicast-routing" at the beginning would cause the high CPU issue?

Thanks

[Reza Sharifi]

Hi,

It is hard to tell why multicast routing is causing high CPU. Most likely a bug in the version of IOS you are running.  I would open a ticket with Cisco TAC, so they can investigate the cause.

HTH

[osw200051]

Thanks :-)