we have 2 4948's with DCM connected to them.
When DCM joins to some mcast group to take traffic everything works fine.
When we connect DCM ports where we are sending traffic we got 99% CPU with process "Cat4k Mgmt LoPri".
show platform health gives next output:
bg-he-l-2#show platform health
%CPU %CPU RunTimeMax Priority Average %CPU Total
Target Actual Target Actual Fg Bg 5Sec Min Hour CPU
K5CpuMan Review 30.00 89.52 30 19 100 500 48 6 2 109:01
Port configuration is :
description LINK dcm xxx
ip address 172.16.0.117 255.255.255.252
ip pim sparse-mode
When we connect this port back to 7609 to 6748 card everything is ok...
what multicast group is used for the DCM?
what's the TTL setting?
7600s have HW limiter for some of these conditions while the 4500 does not.
But we have problem on 4948 not on 7600... On 7600 everything works ok.
It's seems that mcast packets are software switched on 4948 with cat4500e-entservicesk9-mz.151-1.SG.bin
I can not find command like on 7600 for hardware multicast switching.
Issue has been resolved with downgrade to
cat4500e-entservicesk9-mz.150-2.SG4.bin multicast packets are hardware switched and there is no high CPU.
Why 15.x version switch multicast packets in software ?
And confirmet by TAC that this bug is when source is directly connected to 4948.
There is no problem with 15.0.2-SG4...
Cisco bug id is CSCtg79438
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