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Multicast T1 QOS

bruce.porter
Level 1
Level 1

I would like to implement QOS on a pair of T1s being used for multicast. I was told by Cisco TAC to use CBWFQ, sounds reasonable.

You get up to 64 classes (queues) including a default that should run WRED.

I would like to set up one class for the MC traffic and the PIM supporting it. We are interfacing an Enterasys router with a 7513 WAN router. The Enterasys is running standard PIM Sparse.

When I tried to create an ACL to control the traffic into the class, I used "permit ip 224.0.0.0 0.0.0.255 any". This should allow the multicast traffic into the queue. I was wondering if I should also allow any PIM protocols into this outbound queue.

By default the CBWFQ traffic is set to 75% of the IF rate. My thought is to set the bandwidth for this class in the policy map to 750Kb. I would then set the BW of the default class to 250Kb.

We have about 400 users here so I thought that I would use WRED on the default with the number of queues in it set to 64. This should accomodate the wildest number of TCP connections without using the default value of 256 and wasting buffer.

We aren't using VoIP so I haven't specified a priority queue for RTP and don't know how.

Bottom line. I just want to get a last hop solution going where I prioritize the multicast-related traffic. Am I doing enough by running the 224. traffic into the MC class queue?

We are not using Auto RP so I am not concerned about that protocol but I don't know whether or not to run some other PIM protocols into the queue.

I would like to know how many classes I can really have on a 7513.

3 Replies 3

bruce.porter
Level 1
Level 1

Here are the commands I used:

policy-map T1_Multicast_Policy

class Multicast_Traffic

bandwidth 750

class class-default

fair-queue 64

interface e6/0

ip pim sparse-mode

service-policy output T1_Multicast_Policy

ip access-list extended SM_CBWFQ

permit ip any 224.0.0.0 0.0.0.255

class-map Multicast_Traffic

match access-group name SM_CBWFQ

I can't test it since it really needs to go to a WAN hub in another city but does it look good. It will probably get tested Monday. Rush

If you want all IP multicast on the class, you need permit ip any 224.0.0.0 15.255.255.255. The list you have there will only include the locally significant multicasts, which are not routed anyway. PIM itself is multicast on 224.0.0.13, so it would match this class already.

Kevin Dorrell

Luxembourg

Thank you very much!!!! Beautiful.