topic RE: EXOS: STP on MLAG ports in ExtremeSwitching (EXOS/Switch Engine)

EXOS: STP on MLAG ports

M_Nees — Wed, 09 Mar 2016 18:19:00 GMT

Are there any plausible reasons why STP is not possible on mLAG ports ?

For a current network project is would be very useful if i can use STP on core layer links (where 2 links are bonded with mLAG).

RE: EXOS: STP on MLAG ports

André_Herkenrat — Wed, 09 Mar 2016 18:45:00 GMT

Hi Matthias,

You should only use one L2 Protection Protocol at a time. Therefore it's either MLAG or STP

Best Regards
André

RE: EXOS: STP on MLAG ports

M_Nees — Wed, 09 Mar 2016 19:15:00 GMT

Hi Andre, for my current project is would be a need to do that. If you see the mLAG only as a Link Aggregation point is not plausible why this cannot be part of STP (and forward BPDUs).
This aspect is the core of my question!

RE: EXOS: STP on MLAG ports

Mel78__CISSP__E — Wed, 09 Mar 2016 19:15:00 GMT

Your core question is contradicting. If you want STP, 1 link will always be blocked.

No load sharing.

I suggest you go Software-Controlled Redundant Port and Smart Redundancy.

STP is so slow to converge, typical 40 secs !!!. RSTP is 8 secs.

And during convergence, your whole network will be BPDU storm everywhere.

RE: EXOS: STP on MLAG ports

cbuchenau — Wed, 09 Mar 2016 20:08:00 GMT

Matthias, to be clear: If you do not configure STP at all, BPDUs are still being forwarded, also through MLAG links. This is because for the EXOS Switch this is just standard Multicast traffic.

See here for a similar discussion:
https://community.extremenetworks.com/extreme/topics/extreme-summit-x670v-stp-disabled-by-default-it...

RE: EXOS: STP on MLAG ports

M_Nees — Wed, 09 Mar 2016 20:29:00 GMT

Hi Carsten,

your are right i could only enable STP on the specific switch (not on all switches!) with the 2 regarding links (which on have to be blocked).

in my lab environment i use currently software redundant port which works fine.

Regards