Cisco 6260 - max PNNI nodes per peer group

[arthurooo]

Hello,

I'm searching for some PNNI networking planning guides for Cisco 6260 system, but unfortunately with no luck.

If anyone may advise, what is the maximum number PNNI nodes per peer group using 6260?

Of course, the answer is not straight forward. The size of PNNI DB depends on many factors, like: equipment performance (CPU or memory), number of PNNI links in a single Peer Group, summarized addresses and associated PTSEs.

Lets presume my setup consists of average number of 2 links per node, with roughly max. 2 summary addresses per node.

Regards,

Artur

[beth-martin]

Even though there is no strict limitation on the number of PNNI nodes that can be added to a peer group, you will run into problems if you try to add more than 10 PNNI nodes. Even if you add more than 10 nodes only the first 10 nodes will have the effect.

Hope this clarifies.

[arthurooo]

I really appreciate any feedback in this matter as I realize, the question is quite uncommon on this forum. But I have to admit; something is missing in this answer.

I haven’t found any official recommendations in the PNNI notes, but always equipment is limited to certain numbers. Today CPU and memory is more and more powerful, which allows keeping network bigger size. Of course, PNNI solution should be scalable, therefore max number of 10 nodes sounds very poor. I do agree, Cisco 6260 is not a backbone network ATM switch, but still the expectation is a little bit higher.

Also in addition to Martin’s email. If let presume the limitation is only 10 nodes and we exceed this number by adding 11th, 12th node; the whole peer group will be affected. PNNI DB has to be copied to every node in the same per group.

I reckon; the number of handled PTSE messages (all types) is crucial. Second important factor is ability to bundle multiple PTSE into single PTSP, because AAL5 PDU may dramatically increase for bigger size network.

Therefore in my previous email, I tried to provide some sort of real life example. So maybe I will try again: What is max number of nodes per single peer group, if every node uses two PNNI interfaces (for rerouting and load balancing), with maximum 2 summary addresses per node (internal reachable). Number of links is to 2x number of nodes (link metrics is measured in both directions). HPNNI is not taken into account at this stage. If somebody can provide a deeper analysis to my question, I’m so grateful.

Regards,

Artur