topic RE: MLAG to MLAG (Extreme Only) in ExtremeSwitching (EXOS/Switch Engine)

MLAG to MLAG (Extreme Only)

EtherNation_Use — Wed, 08 Jan 2014 06:04:00 GMT

Create Date: Jul 15 2013 7:51AM

I'm trying to connect four extreme switches:

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A and B have an MLAG configured. So do C and D. Both MLAGs are connected together.
A+B are Summit X460 running 12.6.2.10. C+D are Summit X440 running 15.2.2.7
As soon as I enable more than one of the MLAG links, I get packet loss trying to ping across from C or D to A or B.

What's the problem?
Is it that MLAG can't work with another MLAG on the peer side?
Or do I just need to upgrade EXOS on the X460s? (from Chris_Burri)

RE: MLAG to MLAG (Extreme Only)

EtherNation_Use — Wed, 08 Jan 2014 06:04:00 GMT

Create Date: Jul 16 2013 9:36PM

For your information:

I upgraded the 12.6.2.10 switches to 15.2.2.7, but MLAG to MLAG is a definitve no-go. I had to resort to RSTP.
Absolutely disappointing if you ask me - It would have been such an elegant solution offering redundancy and bandwidth.

Still I'd like to know why it doesn't work? MLAG is supposed to appear and act just like a normal LAG to the link partner. And since MLAG-LAG works fine, it really kinda annoys me that MLAG-MLAG does randomly blackhole my ethernet frames 😠

Any insight from the extremists here? (from Chris_Burri)

RE: MLAG to MLAG (Extreme Only)

EtherNation_Use — Wed, 08 Jan 2014 06:04:00 GMT

Create Date: Jul 31 2013 1:36PM

Can't you stack the switches? Easier than MLAG, and you get all redundancy and bandwidth.
(from Luis_Coelho)

RE: MLAG to MLAG (Extreme Only)

EtherNation_Use — Wed, 08 Jan 2014 06:04:00 GMT

Create Date: Aug 1 2013 9:52AM

Paste Your mlag configuration for all switches. I did not try this configuration but It should work. (from karpiu)

RE: MLAG to MLAG (Extreme Only)

EtherNation_Use — Wed, 08 Jan 2014 06:04:00 GMT

Create Date: Sep 7 2013 2:48AM

Chris, Two-tier MLAG definitely works.

Check this implementation guide
https://www.dropbox.com/s/pb4qsdzis05xg9y/SVC%20Tech%20DC%20Implementation%20Guide%20-%20Two%20Tier%20MLAG%20with%20EXOS%2012.6%20and%20Physical%20Servers%20v1.pdf (from Daniel_Flouret)

RE: MLAG to MLAG (Extreme Only)

EtherNation_Use — Wed, 08 Jan 2014 06:04:00 GMT