Mailing List Archive: EAPS and STP

EAPS and STP

Jan 5, 2010, 6:36 PM

Post #1 of 3 (4360 views)

I have a question about using STP and EAPS.

If, for example, I have 4 switches on EAPS ring. A -> B -> C -> D -> back to A

A & B is at the same location. If I enable STP on the protected VLAN
for ports not participating in the EAPS ring on switch A and B, and
accidentally connect a port from switch A and B together, STP won't
see a loop and block the port, would it? (Since STP on each switch
doesn't see each other)

Is there a way to avoid a loop in this kind of topology while using
EAPS? Or do I need to go back to RSTP and not use EAPS?

Thanks in advance!

-Jay
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Re: EAPS and STP [ In reply to ]

zeusdadog at gmail

Jan 7, 2010, 11:48 AM

Post #2 of 3 (4207 views)

Permalink

I am posting this so if anyone else encounters the same question, they
can find the answer.
According to Extreme support folks, indeed, if the two switches are on
the EAPS ring and you connect ports between the two, you can not avoid
a L2 loop even if those ports are running STP. The solution is to
switch from EAPS to STP.

On Tue, Jan 5, 2010 at 9:36 PM, Jay Nakamura <zeusdadog@gmail.com> wrote:
> I have a question about using STP and EAPS.
>
> If, for example, I have 4 switches on EAPS ring. A -> B -> C -> D -> back to A
>
> A & B is at the same location. If I enable STP on the protected VLAN
> for ports not participating in the EAPS ring on switch A and B, and
> accidentally connect a port from switch A and B together, STP won't
> see a loop and block the port, would it? (Since STP on each switch
> doesn't see each other)
>
> Is there a way to avoid a loop in this kind of topology while using
> EAPS? Or do I need to go back to RSTP and not use EAPS?
>
> Thanks in advance!
>
> -Jay
>
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extreme-nsp@puck.nether.net
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Re: EAPS and STP [ In reply to ]

changjie81 at gmail

Jan 7, 2010, 4:24 PM

Post #3 of 3 (4210 views)

Permalink

Sorry for my ignorance, would it be alright if you were to run just EAPS
entirely?
Or some VLANs resides on Switch A and B but not to the rest?

On Fri, Jan 8, 2010 at 3:48 AM, Jay Nakamura <zeusdadog@gmail.com> wrote:

> I am posting this so if anyone else encounters the same question, they
> can find the answer.
> According to Extreme support folks, indeed, if the two switches are on
> the EAPS ring and you connect ports between the two, you can not avoid
> a L2 loop even if those ports are running STP. The solution is to
> switch from EAPS to STP.
>
>
>
> On Tue, Jan 5, 2010 at 9:36 PM, Jay Nakamura <zeusdadog@gmail.com> wrote:
> > I have a question about using STP and EAPS.
> >
> > If, for example, I have 4 switches on EAPS ring. A -> B -> C -> D ->
> back to A
> >
> > A & B is at the same location. If I enable STP on the protected VLAN
> > for ports not participating in the EAPS ring on switch A and B, and
> > accidentally connect a port from switch A and B together, STP won't
> > see a loop and block the port, would it? (Since STP on each switch
> > doesn't see each other)
> >
> > Is there a way to avoid a loop in this kind of topology while using
> > EAPS? Or do I need to go back to RSTP and not use EAPS?
> >
> > Thanks in advance!
> >
> > -Jay
> >
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> extreme-nsp@puck.nether.net
> https://puck.nether.net/mailman/listinfo/extreme-nsp
>