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C H A P T E R 11 Enterprise Standby Router Protocol (ESRP)
169
Multiple ESRP VLANs
If multiple ESRP VLANs share a host port, each VLAN must be in
an ESRP group.
Mixing Clients and Routers on ESRP VLANs
ESRP should not be enabled on a VLAN that is also expected to
exchange routes with other non-ESRP routers (such as routers using
RIP or OSPF). ESRP is intended and designed as a Layer 2 or Layer
3 redundancy method for clients with a single default route. ESRP’s
fail-over operation may interfere with normal routing protocol
communication if an ESRP-enabled VLAN contains other routers
not using ESRP.
Ensure that EDP is Enabled
The Enterprise Discovery Protocol (EDP) must be enabled on the
ports involved with ESRP in order to function correctly. By default
EDP is enabled on all ports. To verify this, use the command:
show port <portlist> info
To enable EDP on a port, use the command:
enable edp ports <portlist>
ESRP and Host Attached Ports
Any ESRP VLANs that share ESRP host-attached ports must be in
different ESRP groups.
Open Shortest Path First and ESRP
For more information on
configuring OSPF, refer to
Chapter 13,"RIP and
OSPF" on page 223.
If you configure Open Shortest Path First (OSPF) and ESRP, you
must manually configure an OSPF router identifier (ID). Be sure
that you configure a unique OSPF router ID on each switch running
ESRP.
To have two or more switches participate in ESRP, these conditions
must be met:
• To make each VLAN redundant, the switches must be able to
exchange packets on the same Layer 2 broadcast domain for that
VLAN. You can use multiple paths of exchange.