From: Yonkerbonk (yonkerbonk@xxxxxxxxx)
Date: Sat Dec 08 2001 - 20:08:48 GMT-3
Well, I'm not saying that the broadcasts are the
entire cause of the slow links, but I thought perhaps
it was a contributing factor - especially the 56K
links.
Mainly, the client is running Citrix which needs 20K
per connection. Some of the smaller sites with 56K I
can see why they're slow, but some of the sites with
384K and not that many users are also slow.
I've tried extended pings with varying packet sizes
and data patterns and they all come back relatively
clean - 98% plus. Delay is not bad either. Only thing
I can see is on some serial interfaces there are FECNs
and the hub site shows BECNs, but it's only 2-3% of
total inbound packets. But I don't see DE set, so
nothing should be getting dropped. Some of the
Ethernet intefaces also has high collisions, 15%, and
I'll take care of that too.
Anyways, the client was just wanting me to make a
general diagnosis of his network. There are little
things here and there that could contribute.
I will put a WAN Sniffer on there and find out more.
Thanks for the reply.
Michael Le, CCIE #6811
--- PimpDaddy <ccie@stephendunn.com> wrote:
> 1.5MB*8/(24*3600)=138bits/sec.
>
> That sure aint a whole lot if you ask me. Probably
> mostly comprised of
> keepalives. Could be related to latency or dropped
> packets, though. What
> do your interface counters look like? What app
> appears slow? What does a
> continuous ping between the client station and app
> server look like?
>
>
> Steve
>
> > I have a client complaining of slow WAN links.
> He
> > has 3 hub routers, each with about 5-7 remote
> links.
> > They are all running OSPF. The remote sites are
> not
> > configured as stub areas even though there is
> nothing
> > behind them (I will remedy that).
> > What I noticed was that the remote router Serial
> > interfaces all had high 'out bcast bytes', that
> > averaged out to 1.5 MB a day. Some of those
> routers
> > have only been up 5 days and some of them have
> been up
> > 15 weeks, but somehow they have all managed to
> average
> > 1.5 MB a day. And the only thing I can think of
> that
> > would show up as broadcasts on the Serial
> interface is
> > OSPF and CDP.
> > They only have 2 subnets listed under OSPF with
> a
> > total of 50 routes when I do a show ip route. The
> show
> > ip ospf database is relatively small too - I only
> need
> > to hit spacebar once to see entire database.
> > Anyone have any ideas if 1.5 MB is high? I think
> it
> > is since there are not alot of routes and there
> > shouldn't be any changes since it's a stub router.
> The
> > 30 minute updates and CDP shouldn't contribute
> much
> > either.
> > Thanks.
> >
> > Michael Le, CCIE #6811
> >
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