[c-nsp] Cat4500 High CPU with Multicast Stream

[Antonio Soares]

I will be applying CoPP today:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/50sg/configur
ation/guide/cntl_pln.html

Something like:

Switch(config)# qos
Switch(config)# macro global apply system-cpp
Switch(config)# policy-map system-cpp-policy
Switch(config-pmap)# class system-cpp-ip-mcast-linklocal 
Switch(config-pmap-c)# police 32000 1000 conform-action transmit
exceed-action drop 
Switch(config-pmap-c)# end

I will let you know if it works as expected.


Regards,

Antonio Soares, CCIE #18473 (R&S/SP)
amsoares at netcabo.pt
http://www.ccie18473.net



-----Original Message-----
From: Phil Mayers [mailto:p.mayers at imperial.ac.uk] 
Sent: quarta-feira, 13 de Julho de 2011 16:53
To: Antonio Soares
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Cat4500 High CPU with Multicast Stream

On 07/13/2011 04:46 PM, Antonio Soares wrote:
> Thanks, I'm feeling better now :)
>
> So in my case, one 4500 with "ip routing" enabled and "ip
multicast-routing"
> disabled, what could be simple and quick to implement ?

I'm not familiar with Cat4500 I'm afraid.

On a 6500 I would do this:

ip access-list standard DENY_MULTI
  deny 224.0.0.0 15.255.255.255
int VlanXXX
  ip multicast boundary DENY_MULTI

...it might work on that platform. As others have pointed out, some 
legitimate traffic uses 224.0.0.0/24 e.g. HSRP, VRRP, PIM, OSPF, etc. so 
be careful with this.

Or use a plain access list on the ethernet port.