Nexus 93's, 95's and Microsoft multicast NLB mitigation
Real Scenario (NXOS not ACI) :-
New: 4 x 9504's to act as a L3 SVI core, with 93180's acting as L2 access. All L2 VLAN's on all links. Each 93180 has uplinks to two 9504's. (9504's meshed)
Server estate running MS NLB in multicast mode, currently VLAN SVI's on 6509 core and access L2 3750's. Same all L2 everywhere. Multicast 03:bf mac's for NLB configured in the global 6500 config (Also Old kit to new kit is L2 bridged)
Luckily we caught before the migration to new that NXOS 9504's dont support multicast NLB, but does unicast.
2 questions about potential mitigations.
Yes the server estate could move to unicast NLB. But this estate could end up spread across multiple 9300s/links in relation to the 9500's. Would what i read that
"Unicast NLB is only supported on the N9K when all NLB cluster members must be reachable via the same port-channel/physical interface"
mean that even unicast NLB is still unworkable ??
Would/if only for the specific (half dozen) NLB VLAN's, we were to make the 95's and 93's L2 only, and put a couple of ASR's .1q'd into the 95's and put the L3 interfaces of these half dozen VLAN's on the ASR's with the NLB mac's config'd on those int's, be an workable option to support unicast NLB (but still not multicast ..) ??
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