User guide

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Figure 10-8: ESRP example using layer 2 and layer 3 redundancy
The BlackDiamond switch, acting as master for VLAN Sales, performs both layer 2
switching and layer 3 routing services for VLAN Sales. The BlackDiamond switch in
standby mode for VLAN Sales performs neither, thus preventing bridging loops in the
VLAN. The BlackDiamond switch in standby mode does, however, exchange ESRP
packets with the master BlackDiamond switch.
There are four paths between the BlackDiamond switches on VLAN Sales. All the paths
are used to send ESRP packets, allowing for four redundant paths for ESRP
communication. The Summit switches, being ESRP-aware, allow traffic within the
VLAN to fail-over quickly, as they will sense when a master/slave transition occurs and
EW_021
Sales
VLAN
(master)
Sales
VLAN
(standby)
OSPF or RIP