On Fri, 10 Jul 2009, victor wrote:
On Fri, 10 Jul 2009 20:30:19 +0400, Jay Ford <[email protected]> wrote:
I don't think you want “ip mroute-cache”, at least not on 7600/6500 boxes.
My guess is that by configuring that you're disabling the hardware-based
forwarding & forcing it to software-based forwarding. Get rid of the “ip
mroute-cache” & see if things get better on the 7600.
ip mroute-cache is the default mode for interfaces. Are you suggesting to do
"no ip mroute-cache" to disable cef completely.
In your original message you said:
I explicitly entered "ip mroute-cache" under every interface
which I took to mean that you were changing the default.
In my experience on 6500 boxes running various 12.2SX versions "ip
mroute-cache" does not show up by default.
If you do "show ip interface" for your edge-facing interfaces, does
IP multicast multilayer switching is enabled
appear near the end of the output?
Also, does "show mls ip multicast" show your multicast traffic being hardware
switched?
Are the 4900 boxes doing L3 or just L2? I suspect they'd do much better at
L2 fan-out of multicast than at L3 fan-out. You're probably hitting a pps
or
packet replication limit before hitting the bps limit.
I agree that this switch will probably perform better doing L2 exchange but
then there is another problem: C7604 carry QinQ vlans and C4924 terminates
them giving each tunnel's payload out of a deferent dot1q-tunnel access port.
If I don't do multicast routing I will need to carry the same multicast
traffic on every configured outer vlan. This will eat up all the bandwidth.
Bummer, dude. I don't have anything to offer about that, other than to
speculate that the QinQ tunnel stuff might be undermining the ability of 1 or
both boxes to efficiently deal with multicast traffic. You might have to
get your Cisco support people in on this one.
________________________________________________________________________
Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: [email protected], phone: 319-335-5555, fax: 319-335-2951
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