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The example illustrates the configuration for
two HSRP-enabled routers participating in two separate VLANs using
InterSwitch Link (ISL). Running HSRP over ISL allows users to configure
redundancy between multiple routers that are configured as front ends for
VLAN IP subnets. By configuring HSRP over ISLs, users can eliminate
situations in which a single point of failure causes traffic
interruptions.
To configure HSRP over an ISL link between
VLANS, perform the following tasks:
- Define the encapsulation format.
- Define an IP address.
- Enable HSRP.
You enable HSRP using the same steps
described in 8.2.1-8.2.5. HSRP is also supported over dot1q trunks and you
may trunk over 802.1Q.
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