Re: Getting pretty close to default IPv4 route maximum for 6500/7600routers.

[Randy Epstein <nanog () hostleasing net>]

On the RSP720-10GE at least, it seems that IPv4 and MPLS are not shared.
Am I correct or am I missing something?

FIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4                - 768k
 MPLS                - 64k
 IPv6 + IP Multicast - 96k (default)

Randy


On 6/9/14, 3:27 PM, "John van Oppen" <jvanoppen () spectrumnet us> wrote:

> It is generally much better to do the following:
>
> mls cef maximum-routes ipv6 90
> mls cef maximum-routes ip-multicast 1
>
> This will leave v4 and mpls in one big pool, puts v6 to something useful
> for quite a while and steals all of the multicast space which is not
> really used on most deployments.
>
>
> This gives us the following (which is pretty great for IP backbone
> purposes in dual stack):
>
> #show mls cef maximum-routes
> FIB TCAM maximum routes :
> =======================
> Current :-
> -------
> IPv4 + MPLS         - 832k (default)
> IPv6                - 90k
> IP multicast        - 1k
>
>
> John
>
>
> -----Original Message-----
> From: NANOG [mailto:nanog-bounces () nanog org] On Behalf Of Jon Lewis
> Sent: Monday, June 09, 2014 12:10 PM
> To: Pete Lumbis
> Cc: nanog () nanog org
> Subject: Re: Getting pretty close to default IPv4 route maximum for
> 6500/7600routers.
>
> Why, in your example, do you bias the split so heavily toward IPv4 that
> the router won't be able to handle a current full v6 table?  I've been
> using
>
> mls cef maximum-routes ip 768
>
> which is probably still a little too liberal for IPv6
>
> FIB TCAM maximum routes :
> =======================
> Current :-
> -------
>  IPv4                - 768k
>  MPLS                - 16k (default)
>  IPv6 + IP Multicast - 120k (default)
>
> given that a full v6 table is around 17k routes today.
>
> A more important question though is how many 6500/7600 routers will fully
> survive the reload required to affect this change?  I've lost a blade
> (presumably to the bad memory issue) each time I've rebooted a 6500 to
> apply this.
>
> On Mon, 9 Jun 2014, Pete Lumbis wrote:
>
> > The doc on how to adjust the 6500/7600 TCAM space was just published.
> >
> > http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-serie
> > s-switches/117712-problemsolution-cat6500-00.html
> >
> >
> > On Tue, May 6, 2014 at 3:48 PM, Pete Lumbis <alumbis () gmail com> wrote:
> >
> > > There is currently a doc for the ASR9k. We're working on getting on
> > > for
> > > 6500 as well.
> > >
> > >
> > > http://www.cisco.com/c/en/us/support/docs/routers/asr-9000-series-agg
> > > regation-services-routers/116999-problem-line-card-00.html
> > >
> > >
> > >
> > >
> > > On Tue, May 6, 2014 at 1:34 PM, <bedard.phil () gmail com> wrote:
> > >
> > > > I would like to see Cisco send something out...
> > > >
> > > > -----Original Message-----
> > > > From: "Drew Weaver" <drew.weaver () thenap com>
> > > > Sent: ÿÿ5/ÿÿ6/ÿÿ2014 11:42 AM
> > > > To: "'nanog () nanog org'" <nanog () nanog org>
> > > > Subject: Getting pretty close to default IPv4 route maximum for
> > > > 6500/7600routers.
> > > >
> > > > Hi all,
> > > >
> > > > I am wondering if maybe we should make some kind of concerted effort
> > > > to remind folks about the IPv4 routing table inching closer and
> > > > closer to the 512K route mark.
> > > >
> > > > We are at about 94/95% right now of 512K.
> > > >
> > > > For most of us, the 512K route mark is arbitrary but for a lot of
> > > > folks who may still be running 6500/7600 or other routers which are
> > > > by default configured to crash and burn after 512K routes; it may be
> > > > a valuable public service.
> > > >
> > > > Even if you don't have this scenario in your network today; chances
> > > > are you connect to someone who connects to someone who connects to
> > > > someone
> > > > (etc...) that does.
> > > >
> > > > In case anyone wants to check on a 6500, you can run:  show platform
> > > > hardware capacity pfc and then look under L3 Forwarding Resources.
> > > >
> > > > Just something to think about before it becomes a story the
> > > > community talks about for the next decade.
> > > >
> > > > -Drew
>
> ----------------------------------------------------------------------
>  Jon Lewis, MCP :)           |  I route
>                              |  therefore you are _________
> http://www.lewis.org/~jlewis/pgp for PGP public key_________