[AusNOG] Assistance in picking a router

[Beeson, Ayden]

Hi Tom,

We are not filtering any prefixes at all; it's a literal full feed.

I haven't found any problems with it cutting off anything yet, it's theoretically possible it is but it's not something we have seen.

I had a quick look, I'm seeing this:

UTS-4500#show cef fib
14573 allocated IPv4 entries, 0 failed allocations
13295 allocated IPv6 entries, 0 failed allocations

Which is interesting, I am seeing 440k BGP prefix's in IPv4 alone, but it hasn't caused us any problems, maybe cef is summarising by network or something....

CEF is not something I know a HUGE amount about tbh, enough to get its function and perform basic troubleshooting, my understanding is if the FIB was full it would software switch the packets and we are definitely not seeing any CPU load on it.

Thanks,
Ayden Beeson


-----Original Message-----
From: Tom Lanyon [mailto:tom+ausnog at oneshoeco.com]
Sent: Thursday, 18 July 2013 12:12 PM
To: Beeson, Ayden
Cc: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Assistance in picking a router

Hi Ayden,

On 18/07/2013, at 9:22 AM, "Beeson, Ayden" <ABeeson at csu.edu.au> wrote:
> We currently use a 4500-X as our primary net device and it collects a full BGP v4 and v6 route table with no problems at all and its capable of 10gb/s on all its interfaces.

Just curious - you say a full table via BGP on your 4500-X device, but my understanding is that they have a maximum 256K IPv4 and 128K IPv6 FIB entries which should be well exceeded with a full v4 table - are you filtering prefixes from the FIB?

Cheers,
Tom

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