No, it is currently not possible to upgrade a VC stack one member at a time. I have told my Juniper contacts that this is an important feature for us but so far no luck! --- Martin Levin IT-strategy & planning Mölndals stad
>>> Från:Joe Hughes <[email protected]> Till:<[email protected]> Datum:2010-01-13 21:45 Ärende:[j-nsp] EX4200 resilience (VC vs 10GB cross-connect) Hi Take the following scenario; Several racks - each with a pair of EX3200 switches (cross-connected) - each with separate L3 uplinks back to a pair of aggregation layer EX4200s (so, 1 from each rack switch), all running OSPF. I'm trying to understand if there are any drawbacks in making the two aggregation layer EX4200s a VC - or whether a simple L3 cross-connect using a LAG or the 10Gbps ports makes more sense, factoring in things like resilience, ease of upgrades etc. If you go on the basis the two EX4200s are two distinct switches with a L3 path between them, it is easy for me to visualise how the network will behave and (hopefully) understand how failover scenarios will play out. The obvious disadvantage of this is you are using up vital 10Gbps ports which could be used elsewhere, and it does seem non-sensical given the higher speed VC ports (+ the other VC advantages). I've read the VC Best practice guide and in all their examples, they have two sets of 2-switch VCs at the aggregation layer - which is making me wonder if a single VC (of two switches) and treated as one switch poses more of a risk than simply two distinct switches. I'm guessing if you have two links back from each rack - each to a different member of the VC, then the 'risks' are pretty much the same as having two separate switches? In terms of software upgrades - is it possible to upgrade one member at a time (as you would in a non-VC setup) so as to not interrupt connectivity from the access\rack switches? Are there any other situations\operations on a VC that would take both switches offline - further making it more sense to either have two switches, or two sets of 2 members VCs? Cheers Joe _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
