[f-nsp] Multicast causing high CPU

[Jeroen Wunnink]

Do a: sh cam-partition detail

See if any of the cam counters are (near) zero, if so you might need to 
restructure your cam partitions. When running out of CAM, the packets 
will be processed over CPU, something you really don't want to do on a 
bigiron.

Alexey Kouznetsov wrote:
> There are totally no IP ROUTING. Only MCAST ROUTING and L2 switching. 
> Now I have added no icmp redirects. but as far as here are no IP 
> routing traffic, there are no icmp redirect generates and no any CPU 
> changes seen. Also I already have
>  no ip source-route
> in the config
> There are no RIP, no OSPF. only MBGP routing protocol.
> # egrep '^router' config
> router dvmrp
> router pim
> router msdp
> router pim
> router bgp
>  
> in bgp router no any unicast active neighbors. only for address-family 
> ipv4 multicast
> we already have
> ip multicast-perf
> in our config for at list last year. (switch was rebooted after this 
> command added)
>  
> Same as we already added
>  
> mcast-hw-replic-oar
> ip multicast hardware-drop
> in config and it was reboted after such commands added. No any changes 
> seen.
>  
> Also I tried to add
> router pim
> + hardware-drop
> and no any changes seen.
>
> /Alexey
> 2009/3/12 Dimitar Kosadinov <kgb at bginfo.net <mailto:kgb at bginfo.net>>
>
>     always use "no ip icmp redirect" !!!
>     this safe Your CPU :)
>     I dont sure Your multicast problem is this, but just use it. This
>     reflect to OLD RIPv1 based routing only, I sure you dont use rip.
>     try use "ip multicast-perf"  too / need reload btw to see changes /
>     sorry for my bad english
>

-- 

Met vriendelijke groet,

Jeroen Wunnink,
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