[c-nsp] c6k msfc - hsrp flapping
kevin gannon
kevin at gannons.net
Fri May 19 08:18:07 EDT 2006
You running multicast DM ?
Regards
Kevin
On 5/19/06, lee.e.rian at census.gov <lee.e.rian at census.gov> wrote:
>
> Hi Yuri,
>
> "Yuri Lukin" <lists at swaggi.com> wrote on 05/18/2006 04:11:10 PM:
>
> > > The closest match is the section on HSRP Intermittent State Changes on
> > > Multicast Stub Network. But I'm pretty sure that isn't that problem
> > > because the non-dr router is msfc1. Msfc2 is the router having all
> the
> > > problems with hsrp flapping.
> >
> > Think about it from another perspective: what if too much multicast
> traffic
> > hitting your DR (msfc2) is causing HSRP issues?
>
> The assumption I've been making is that enough multicast traffic hitting
> the msfc to cause hsrp and eigrp to flap would also cause very high cpu
> busy and/or lots of input queue drops. Maybe that's a bad assumption, but
> that's why I think the traffic is being dropped before it gets to the
> msfc.
> But I don't know what commands to run to prove or disprove that theory.
>
> > Are these switches hybrid or native?
>
> Hybrid Sup1a/msfc
> They were scheduled to be upgraded in the near future but they just jumped
> to the head of the line :-)
> I think we're just going to leave multicast turned off to this site until
> they're upgraded.
>
> > How are they interconnected?
>
> L3 point-to-point links between the routers.
>
> > Can you check the various counters to see which interfaces are
> > showing excessive multicast traffic?
>
> None of the multicast counts look excessive to me
> (counters haven't been cleared & uptime is 2 days, 16 hours)
> I hadn't thought about it until now, but unless hsrp keepalives aren't
> counted the multicast counts are impossibly low.
>
> Lots of broadcasts, but we have IPX and Decnet at this site.
>
> msfc2#sh int | inc mult
> Received 1258545 broadcasts (158 IP multicast)
> Received 901605 broadcasts (146 IP multicast)
> Received 615971 broadcasts (24 IP multicast)
> Received 677219 broadcasts (13 IP multicast)
> Received 595778 broadcasts (142 IP multicast)
> Received 580679 broadcasts (24976 IP multicast)
> Received 398487 broadcasts (9 IP multicast)
> Received 994727 broadcasts (23 IP multicast)
> Received 522485 broadcasts (50 IP multicast)
> Received 539081 broadcasts (12 IP multicast)
> Received 603623 broadcasts (9 IP multicast)
> Received 531783 broadcasts (6 IP multicast)
> Received 310361 broadcasts (4 IP multicast)
> Received 513320 broadcasts (7 IP multicast)
> Received 587772 broadcasts (20 IP multicast)
> Received 537649 broadcasts (9 IP multicast)
> Received 529475 broadcasts (65615 IP multicast)
> Received 297437 broadcasts (0 IP multicast)
> Received 547120 broadcasts (17532 IP multicast)
> Received 806704 broadcasts (85 IP multicast)
> Received 1621485 broadcasts (31 IP multicast)
> Received 1550681 broadcasts (0 IP multicast)
> Received 647764 broadcasts (1132 IP multicast)
> Received 509518 broadcasts (308 IP multicast)
> Received 472302 broadcasts (15 IP multicast)
> Received 562089 broadcasts (0 IP multicast)
> Received 304329 broadcasts (0 IP multicast)
> Received 320419 broadcasts (1055370 IP multicast) <= link to other
> msfc
> Received 253866 broadcasts (79285 IP multicast)
> Received 207589 broadcasts (904958 IP multicast)
> Received 473552 broadcasts (3 IP multicast)
> Received 440555 broadcasts (0 IP multicast)
> Received 1291723 broadcasts (40 IP multicast)
> Received 0 broadcasts (0 IP multicast)
> Received 1573416 broadcasts (0 IP multicast)
> Received 431940 broadcasts (0 IP multicast)
> Received 2071880 broadcasts (83 IP multicast)
> Received 426213 broadcasts (0 IP multicast)
> Received 443926 broadcasts (0 IP multicast)
> Received 429584 broadcasts (0 IP multicast)
> Received 315648 broadcasts (0 IP multicast)
> Received 287898 broadcasts (0 IP multicast)
> Received 534388 broadcasts (128 IP multicast)
> Received 545230 broadcasts (0 IP multicast)
> Received 542563 broadcasts (0 IP multicast)
> Received 376464 broadcasts (8172 IP multicast)
> Received 378421 broadcasts (1 IP multicast)
> Received 373696 broadcasts (3 IP multicast)
> Received 318151 broadcasts (50 IP multicast)
> Received 296260 broadcasts (0 IP multicast)
> Received 0 broadcasts (0 IP multicast)
> Received 1100347 broadcasts (4960 IP multicast)
> Received 195736 broadcasts (0 IP multicast)
> Received 1134048 broadcasts (0 IP multicast)
> Received 23 broadcasts (0 IP multicast)
> Received 115132 broadcasts (0 IP multicast)
> Received 195576 broadcasts (128 IP multicast)
> Received 194162 broadcasts (0 IP multicast)
> Received 0 broadcasts (0 IP multicast)
> Received 272921 broadcasts (0 IP multicast)
> Received 274876 broadcasts (0 IP multicast)
> Received 0 broadcasts (0 IP multicast)
> Received 273252 broadcasts (0 IP multicast)
> Received 0 broadcasts (0 IP multicast)
> msfc2# sh int | inc Input q
> Input queue: 0/75/0/7 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/3/5 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/3/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/6/551 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/3/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/1/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 1/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/4 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/1/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 1/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/1/2076 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/1/4 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/34/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/150/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/2/4 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2531 (size/max/drops/flushes); Total output drops: 0
> <=== link to the other msfc
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/3/2729 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 1/75/0/3 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/2 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/6 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/3 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/1 (size/max/drops/flushes); Total output drops: 0
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
> msfc2#
>
>
> > Perhaps you can "debug standby" as the problem is happening and paste
> > the output to the list?
>
> Probably not unless I can tell my boss that I've got a pretty good idea of
> what the problem is & how to fix it.
> I think we're just going to leave multicast turned off & upgrade the core
> sup1a/msfcs to sup720s.
>
> Thanks,
> Lee
>
>
>
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