Layer 2 vs. Layer 3 to TOR

Malte von dem Hagen mvh at
Thu Nov 12 22:25:58 UTC 2009


Am 12.11.2009 22:29 Uhr schrieb Jonathan Lassoff:
> Are there any applications that absolutely *have* to sit on the same
> LAN/broadcast domain and can't be configured to use unicast or multicast
> IP?

yes. There are at least some implementations of iSCSI and the accompanying
management services (e.g., for redundancy) that do not work well via routed
connections. Generally, storage services may be difficult being routed.

Further, some aspects of VMware (clusters) including management "need" L2
connectivity, for example when you want to dynamically shift VMs from one
hardware node to another transparently and so on and so forth.

The same applies to several load balancing and/or redundancy/failover mechanisms.



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