topic RE: flap ospf after add(delete) port to(from) sharing group in ExtremeSwitching (EXOS/Switch Engine)

flap ospf after add(delete) port to(from) sharing group

Anton_Nekhorosh — Thu, 10 Sep 2015 18:15:00 GMT

I use summit x670 with lacp 20g.
After add(delete) port to(from) sharing group allways ospf flapping between two x670. Why? What to do?

In the same time of L2 the traffic continues to work without stopping, flapping only osfp session.

Please help.

RE: flap ospf after add(delete) port to(from) sharing group

OscarK — Thu, 10 Sep 2015 18:21:00 GMT

I know when you add a port to an existing LAG the complete LAG is re-initialized, if this is the only port in a vlan that could cause that IP to go down and come back up, maybe this could explain the OSPF flap ?
I know this is fixed in the latest EXOS releases, only cannot find quickly which release contains the fix.

RE: flap ospf after add(delete) port to(from) sharing group

Anton_Nekhorosh — Thu, 10 Sep 2015 18:29:00 GMT

It would be magnificent if you found the version. Thank you.

RE: flap ospf after add(delete) port to(from) sharing group

OscarK — Thu, 10 Sep 2015 18:48:00 GMT

From what I can find 15.6.1 and higher.

RE: flap ospf after add(delete) port to(from) sharing group

Anton_Nekhorosh — Thu, 10 Sep 2015 19:12:00 GMT

Hmm... last recommended for x670 EXOS 15.5.4.2
What to choose from 15.6.x? 😞

RE: flap ospf after add(delete) port to(from) sharing group

Anton_Nekhorosh — Thu, 10 Sep 2015 19:40:00 GMT

May be you know patch version for 15.5.4.2 ?

RE: flap ospf after add(delete) port to(from) sharing group

OscarK — Thu, 10 Sep 2015 19:40:00 GMT

This was an improvement (not a bug) and these are not backported, so only 15.6 and higher are having this improvement. I would recommend using the latest patch (15.6.3.1-patch1-5 at this moment).

RE: flap ospf after add(delete) port to(from) sharing group

Karthik_Mohando — Fri, 11 Sep 2015 08:27:00 GMT

I believe the recommendation would be update in a day or two in the official website, as per internal update the upcoming recommended EXOS version for X670 is 15.6.3.1-patch1-5

RE: flap ospf after add(delete) port to(from) sharing group

Nikolay_Chernya — Fri, 11 Sep 2015 15:34:00 GMT

Hmm.. May be you have a decision how we can add or delete ports from LAG without ospf flapping on current software? Somthing like configure variables, hold timers, may be.. We can try it on lab.

The main problem for us that after LAG re-initialize and flap of ospf(1-2 secs) we have broken mpls-connectivity which decides only by down/up links.

We can't do that , and we haven't 5 min for flashing new firmware without reconstruction of network