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Fwd: Route cache leak on MLX 5.0.00b ?

 

 

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georgeb at gmail

Apr 7, 2011, 4:52 PM

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Fwd: Route cache leak on MLX 5.0.00b ?

Should have gone to the entire list.

---------- Forwarded message ----------
From: George B. <georgeb [at] gmail>
Date: Thu, Apr 7, 2011 at 4:23 PM
Subject: Re: [f-nsp] Route cache leak on MLX 5.0.00b ?
To: Dunc <dunc.lockwood [at] thebunker>


Reboot clears the problem just fine. It isn't a matter of too few allowed.
For some reason it can get into a state where it never clears out stale
entries. It took six months to get into that state. Filled up CAM on both
the primary ingress and egress modules.

After rebooting it is just fine, over 300,000 entries free.

So it isn't a config problem, it is a "holy crap, this thing just went
wonky" problem.




On Thu, Apr 7, 2011 at 2:42 AM, Dunc <dunc.lockwood [at] thebunker> wrote:

> Hi,
>
> What are your system-max values for ip-cache and ip-route set to?
>
> Are you using a CAM profile with enough room?
>
>
> I've seen very strange things happen once you hit a limit and usually
> end up changing something and rebooting.
>
> Cheers,
>
> Dunc
>
>
>
> On 07/04/11 02:28, George B. wrote:
> > Has anyone seen route cache issues on 5.0.00b?
> >
> > I have two routers both have basically the same peers:
> >
> > First one:
> >
> > IP Routing Table - 349996 entries
> >
> > Second one:
> >
> > IP Routing Table - 350213 entries
> >
> > If I do "sho ip cache" on the first unit, I get:
> >
> > Total IP and IPVPN Cache Entry Usage on LPs:
> > Module Host Network Free Total
> > 1 131 349869 0 350000
> > 2 143 349857 0 350000
> >
> > Both units were in that state when I logged into them earlier today.
> >
> > If I rconsole to either module and "clear ip cache", it clears out maybe
> > 50 routes and that's it.
> >
> > After rebooting the second unit and letting it run for a couple of
> > hours, it looks like:
> >
> > Total IP and IPVPN Cache Entry Usage on LPs:
> > Module Host Network Free Total
> > 1 219 16763 363018 380000
> > 2 54 33 379913 380000
> >
> > Which is much closer to what I expected to see and is closer to what
> > another pair of units have after running for several weeks (notice I
> > upped the max on this one but that doesn't really matter). That first
> > unit is obviously wacky (but as I mentioned, both units were in that
> > state). Another pair of units that have been running for months:
> >
> > uptime is 160 days 21 hours 40 minutes 8 seconds
> > IP Routing Table - 349593 entries
> >
> > Total IP and IPVPN Cache Entry Usage on LPs:
> > Module Host Network Free Total
> > 1 1021 62984 285995 350000
> > 2 39 1358 348603 350000
> >
> >
> >
> > Both units were reporting stuff like this in the logs:
> >
> > Apr 7 01:26:17:I:Warning: MODULE 1 - No free cache entry for new rout
> > Apr 7 01:26:17:I:Warning: MODULE 2 - No free cache entry for new rout
> > Apr 7 01:26:08:I:Warning: cannot allocate free cache entr
> > Apr 7 01:26:04:I:Warning: cannot allocate free cache entr
> > Apr 7 01:25:07:I:Warning: cannot allocate free cache entr
> >
> > It sure looks like some kind of cache leak to me, like it can't reap
> > stale cache entries.
> >
> > Anyone seen anything like this? Looks like a reboot clears it just fine.
> >
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