[AusNOG] FW: Assistance in picking a router

Thu Jul 18 14:24:21 EST 2013

Sorry should have forwarded this to the list.

Spot on, I assume it's not the first I get hence it's not inserted first but definitely seems to be the reason.

Thanks,
Ayden Beeson

-----Original Message-----
From: Beeson, Ayden
Sent: Thursday, 18 July 2013 2:17 PM
To: 'Tom Lanyon'
Cc: 'Ben Dale'
Subject: FW: [AusNOG] Assistance in picking a router

This may well explain it.

Checked, first entry

UTS-4500#show ip cef
Prefix               Next Hop             Interface
0.0.0.0/0            113.197.8.1          TenGigabitEthernet1/1

I guess the default route is rule #16k in my BGP table I get from AARNET :)

Thanks,
Ayden Beeson

-----Original Message-----
From: Beeson, Ayden
Sent: Thursday, 18 July 2013 2:14 PM
To: 'Ben Dale'
Subject: RE: [AusNOG] Assistance in picking a router

Actually its likely one of the installed routes is the default yes :)

That's probably it, I'm not filtering anything at all so it will be coming through as well as everything else!

Thanks,
Ayden Beeson

-----Original Message-----
From: Ben Dale [mailto:bdale at comlinx.com.au]
Sent: Thursday, 18 July 2013 1:47 PM
To: Beeson, Ayden
Subject: Re: [AusNOG] Assistance in picking a router

Maybe one of the 14K prefixes that are installed is the default?  Nothing in your policy about only installing routes originated from AARNET AS?

On 18/07/2013, at 1:39 PM, "Beeson, Ayden" <ABeeson at csu.edu.au> wrote:

> I've had a look, it shows enabled for distributed and running.
>
> I am seeing some punted packets, but they are all for "destined for us" which is normal.
>
> I'll have to keep an eye on that, I checked our secondary BGP router at Canberra (6503) and its showing the same sort of numbers for the FIB and the BGP networks / prefix's as well.
>
> Thanks,
> Ayden Beeson
>
>
> -----Original Message-----
> From: Tom Lanyon [mailto:tom+ausnog at oneshoeco.com]
> Sent: Thursday, 18 July 2013 1:00 PM
> To: Beeson, Ayden
> Cc: ausnog at lists.ausnog.net
> Subject: Re: [AusNOG] Assistance in picking a router
>
> On 18/07/2013, at 11:57 AM, "Beeson, Ayden" <ABeeson at csu.edu.au> wrote:
>> 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.
>
>
> As you say, a full table should be over 440k:
>
> #show cef fib
> 458950 allocated IPv4 entries, 0 failed allocations
> 13437 allocated IPv6 entries, 0 failed allocations
>
> It's interesting that you don't see any failed allocations.
>
> Does 'show ip cef summ' show it fully enabled?  Does 'show ip cef switching statistics [feature]' show punted packets?
>
> Tom
>
> Charles Sturt University
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