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| 6.4 |  | HSRP Configuration |
| 6.4.8 |  | HSRP over trunk links |

Figure illustrates the configuration for two HSRP-enabled routers participating in two separate VLANs using 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 ISL, situations in which a single point of failure causes traffic interruptions can be eliminated.

To configure HSRP over an ISL link between VLANs, perform the following tasks:

1. Define the encapsulation format
2. Define an IP address
3. Enable HSRP

HSRP is also supported over 802.1Q trunks.