Extreme Networks ExtremeWare XOS 11.1, Manual

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ESRP Examples
ExtremeWare XOS 11.1 Concepts Guide
349
Figure 48: Single ESRP domain using Layer 2 and Layer 3 redundancy
The BlackDiamond 10808 switch, acting as master for ESRP domain esrp1 , performs both Layer 2
switching and Layer 3 routing services for VLAN Sales . The BlackDiamond 10808 switch in slave mode
for ESRP domain esrp1 , performs neither for VLAN Sales , thus preventing bridging loops in the VLAN.
The BlackDiamond 10808 switch in slave mode does, however, exchange ESRP packets with the master
BlackDiamond 10808 switch.
There are four paths between the BlackDiamond 10808 switches on VLAN Sales . All the paths are used
to send ESRP packets, allowing for four redundant paths for communication. The edge switches, being
ESRP-aware, allow traffic within the VLAN to failover quickly because these edge switches sense when
a master/slave transition occurs and flush FDB entries associated with the uplinks to the ESRP-enabled
BlackDiamond 10808 switches.
The following commands are used to configure both BlackDiamond 10808 switches. In this scenario, the
master is determined by the programmed MAC address of the switch because the number of active
links for the VLAN and the priority are identical to both switches. This example assumes the following:
●
ESRP election algorithm used is the default for standard mode (
ports > track > priority >
mac
).
●
The Inter-router backbone is running OSPF, with other routed VLANs already properly configured.
Similar commands would be used to configure a switch on a network running RIP.
EX_097
Domain - esrp1,
VLAN - Sales
(master)
Domain - esrp1,
VLAN - Sales
(standby)
OSPF or RIP