[c-nsp] feasible number of routing adjacencies on a C76K
Kinczli Zoltán
Zoltan.Kinczli at Synergon.hu
Thu Aug 4 05:20:55 EDT 2005
Hello,
Given a network providing L3 VPN service, with C7600s running with 12.2SX as PE routers. Due to redundacy requirements dynamic PE-CE routing has to be deployed
in each VPN but since average traffic/load per VPN is rather low/small customer is tempted to terminate over hundred VPNs per PE (potentially over 300 hundred)
For a reason customer is fallen in love with OSPF and since 12.2(18)SXE the maximum number of OSPF processes is not hard-limited anymore but:
I want to push them to RIPv2 on PE-CE:
- as the topology is very-very-very simple; just 2 CE RTRs per VPN (internal C topology is deemed to be simple as well)
- as is it much simpler than OSPF
---> so the practical routing ADJ limit is higher in case of RIP
- as it won't require a process per VPN, just a routing context
- as it won't bind them to one and only sw release (as of now) namely 12.2(18)SXE (which, I don't belive, is the sw train we shall use today)
Still i'm worried about the _practical_ limit of RIPv2 routing adjacencies per C76K/Sup720?
The number of RT/CEF entries per VPN is again very low, say 2-3 prefix per VPN, so the real limitig factor could be the number of routing ADJ.
Any experiences or thoughts about that?
tia,
-zoltan
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