Forum Discussion
smp_86112
Jun 28, 2012Cirrostratus
assigning multiple interfaces to VLAN
I have a GTM with a single ethernet connection to a switch. My goal is to establish a second ethernet connection to a second switch for redundancy. But my understanding from our Cisco guys is that I can't etherchannel across two different switches.
From the F5 perspective, it appears that I can simply add a second physical interface to the VLAN. Will that work if I have two interfaces, which are not trunked, in a single F5 VLAN, connected to two different switches?
- giltjrNimbostratusIt depends on what type of Cisco switches. Some switches can be "stacked" that is two or more individual switches appear as a single switch.
- El_JefeNimbostratusAsk your Cisco guys if they can do LACP Etherchannels and rejoin them in the back end. I know some of the Nexus switches do this, because I've done it. It's a trunk on the F5 side, but don't tell them that, a Trunk is tagged VLANs in the Cisco world.
- smp_86112CirrostratusThanks for your comments.
- HamishCirrocumulusI cant think of any cisco switches hat do not do lacp... Catos perhaps, but thats been obsolete for a long time. Nexus ONLY does LACP. No pagp at all.
- smp_86112CirrostratusI'm probably not communicating this very well. My goal is still to get some network redundancy *without* etherchannel. My idea is to simply connect two F5 interfaces to different switches, then add both F5 interfaces into the F5 VLAN. I'm wondering if this config will work without an F5 trunk, since I can't do etherchannel.
- El_JefeNimbostratus@ Hamish - exactly what I was talking about.
- nitassEmployeei think it is fine. also, if there is network connectivity between 2 switches, switch will block one link either between switch or bigip/switch by stp.
- HamishCirrocumulusJust make sure you either have STP enabled either active or pass-though. If you block STP you'll get a bridging loop. That's bad... Symptoms ranging from it's a bit slow to 'oh my god the whole network just went down in both data centres'.
- HamishCirrocumulusJust make sure you either have STP enabled either active or pass-though. If you block STP you'll get a bridging loop. That's bad... Symptoms ranging from it's a bit slow to 'oh my god the whole network just went down in both data centres'.
- smp_86112CirrostratusIs there a way to configure interfaces to work in an active/standby mode, so I can two interfaces connected to different switches, but only one being active?
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