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New Member

Multicast PIM SM configuartion with Tibco RdV design

Hi there,

We need to implement PIM SM on our core routers. We have many clients using Tibco middleware applications. Hence we don't have centralised source but each client application workstation will be considered as source for the multicast group by PIM enabled routers.

What are Cisco recommendation in terms of number of (S,G) or (*,G) entries in multicast routing tables? Maximum? Any limitations?

What is the size of one entry in memory?

Since there can be many hosts, multicast entries in routing tables will change a lot constantly. Do you recommend shortest path tree or not with Tibco RendezVous in order to limit (S,G) entries?

Thanks for your help,


Pierre Bichon


Re: Multicast PIM SM configuartion with Tibco RdV design

This varies from platform to platform. For instance, the 4908G –L3 supports up to 12,000 entries. Also, some platforms do this via hardware, and some do not. A good example is the MSFC vs. the MSFC2 on the Cat6000. The MSFC only does (S,G) in hardware, while the MSFC2 does both. This makes for very different capabilities. Check your specific platform’s documentation.

New Member

Re: Multicast PIM SM configuartion with Tibco RdV design

Something else to consider is RP placement. The RP(s) for a particular group should be placed closer to the source. This will limit the amount of (S,G) entries in the newtork, thereby cutting down on network resources used.

As far as shortest path tree VS. shared tree it really depends on your implementaiton. Many trading floor Tibco installations have set "stp infinity" to ensure shared tree usage. The thought here is that multicast will have a predictable path across the network. This may become important when trying to troubleshoot issues. Shortest path tree will provide for the most effecient path, however this will be determined by the routing table (use caution).

S,G VS. *,G entry limiation depends on platform. Check with your specifc hardware for exact numbers.

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