[172278] in North American Network Operators' Group
Re: Getting pretty close to default IPv4 route maximum for 6500/7600
daemon@ATHENA.MIT.EDU (joel jaeggli)
Tue Jun 10 13:34:25 2014
X-Original-To: nanog@nanog.org
Date: Tue, 10 Jun 2014 10:33:56 -0700
From: joel jaeggli <joelja@bogus.com>
To: =?UTF-8?B?xYF1a2FzeiBCcm9taXJza2k=?= <lukasz@bromirski.net>,
Blake Hudson <blake@ispn.net>
In-Reply-To: <A9A0A9FD-B070-46D5-835A-2D60D11DF7A6@bromirski.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
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On 6/10/14, 10:15 AM, =C5=81ukasz Bromirski wrote:
> Hi Blake,
>=20
> On 10 Jun 2014, at 19:04, Blake Hudson <blake@ispn.net> wrote:
>=20
>> In this case, does the 512k limit of the 6500/7600 refer to the RIB or=
the FIB? And does it even matter since the BGP prefix table can automati=
cally be reduced to ~300k routes?
>=20
> Te 512k limit refers to FIB in the B/C (base) versions of 6500/7600
> Supervisors and DFCs (for line cards). BXL/CXL versions have FIB for
> 1M IPv4 prefixes.
>=20
> You can find more information here:
>=20
> http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series=
-switches/117712-problemsolution-cat6500-00.html
>=20
> And yes, you=E2=80=99re right - no matter how many neighbors you have, =
the FIB
> will only contain best paths, so it will be closer to 500k entries in
> total rather than N times number of neighbours.
Until you add multi-as multipath and addpath and a couple VRFs and all
of sudden FIB budget blows up.
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