[c-nsp] feasible number of routing adjacencies on a C76K

[Rodney Dunn]

On Thu, Aug 04, 2005 at 11:20:55AM +0200, Kinczli Zoltán wrote:
> 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?


Be careful that you don't start dropping the RIP updates off
the socket queue. You can monitor that with 'sh ip socket detail'.

You can bump the depth up under router rip. That's the most common
problem I see.

Most large scale hub/spoke or PE/CE setups I see are doing either
BGP or EIGRP Stubs.

>  
> tia,
>  -zoltan
> 
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