Re: [Nolug] Any VLAN experts out there?

From: Chris Jones <techmaster_at_gmail.com>
Date: Wed, 4 May 2011 22:29:35 -0500
Message-ID: <BANLkTinZHzo6gbbHcDrJQYMVbVFnMDOq8Q@mail.gmail.com>

I have DHCP issues on the same switch that the router (dhcp server) is
plugged directly into. I don't think it has anything to do with the bridge
or the trunk. No unusual ping times, I get the usual 10ms ping time. I've
browsed across it to a server, and moved large files around, it was like a
typical wired 100Mb network, across the bridge. So I think the bridge
itself is fine. I'm wondering if maybe there's some kind of encapsulation
math I'm missing. Like with some internet connections, you have to lower
MTU to make up for some encapsulation that the ISP's equipment does. Is
there somewhere that maybe I have to tune something such as this, an MTU for
a trunk link? I'm getting the feeling that if I ditch the Dell and get a
second Linksys/Cisco Small Business switch (3000 something was the model I
think) it might solve every one of my problems. Stackable switches are made
to be EASILY stackable, but with one caveat: you have to stack the same
make/model of switch. I didn't have that luxury this time, but it might be
worth it for me to make a push for it. Everything worked perfectly in the
dry run at our office, too.

On Wed, May 4, 2011 at 7:16 PM, Jimmy Hess <mysidia@gmail.com> wrote:

> On Wed, May 4, 2011 at 5:32 PM, Chris Jones <techmaster@gmail.com> wrote:
> > Yes, vlan10 even works. I can ping the cable modem with a laptop on the
> > other switch. The one weird thing I'm seeing is dhcp takes a few minutes
> to
> > give out an ip.
>
> Are you looking at the latency you get back when you ping? Anything
> unusual there?
> eg. 64 bytes from XX.YY.ZZ.WW: icmp_seq=1 ttl=64 time=0.617 ms
>
> I would consider the existence of a wireless bridge on a trunk link a
> suspect in regards to DHCP performance issues.
>
> Perhaps some ping tests, to verify delay, latency stability, and ping
> loss numbers
> between the two switches would be in order.
>
>
> Trunk links should be full duplex at both ends, but if there was a
> mismatch,
> congestion or instability of the link, there could be high delay/loss
> of traffic;
> including DHCP traffic.
>
> --
> -J
> ___________________
> Nolug mailing list
> nolug@nolug.org
>

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Received on 05/04/11

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