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C H A P T E R 11 Enterprise Standby Router Protocol (ESRP)
175
Figure 11.1: ESRP host attach
Other applications allow lower-cost redundant routing
configurations, because hosts can be directly attached to the switch
involved with ESRP. The ESRP HA feature requires at least one
link between the master and standby ESRP switch for carrying
traffic and to exchange ESRP hello packets.
ESRP Domains
An ESRP Domain is an optional ESRP configuration that allows
you to configure multiple VLANs under the control of a single
instance of the ESRP protocol. By grouping multiple VLANs under
one ESRP group, the ESRP protocol can scale to provide protection
to large numbers of VLANs. All VLANs within an ESRP group
simultaneously share the same active and standby router and
failover.
ESRP Groups
A switch cannot perform
both master and slave
functions on the same
VLAN for separate
instances of ESRP.
The 480T routing switch supports running multiple instances of
ESRP within the same VLAN or broadcast domain. This
functionality is called an ESRP group. Though other uses exist, the
most typical application for multiple ESRP groups is when two or
more sets of ESRP switches are providing fast-failover protection
within a subnet.
480T_045R
OSPF/BGP4
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
® ®