FHRP

First Hop Redundancy Protocols

Creates fault tolerance for gateways.

HSRP

Cisco Proprietary, only does redundancy.

Only active and standby routers

Version 1 Addresses: 0000.0C07.AC##/224.0.0.2

Version 2 Addresses: 0000.0c9f.f###/224.0.0.102

Preempt is not on by default

Default hello: 3s

Default Hold: 10s

Priority: Higher is better


Configuration

(config)#interface g0/1

(config-if)#standby 10 ip "192.168.0.1"

(config-if)#standby 10 preempt

Optional

(config-if)#standby 10 priority "110"

(config-if)#standby 10 track "1" decrement "10"

(config)#track 1 interface "g0/2"

(config)#track 2 up route "x.x.x.x/xx" reachability


Authentication

Keystring:

(config-if)#standby 10 authentication md5 key-string 7 $3cr3T



Show Commands

# show standby brief
# debug standby terse

VRRP

Open standard

Similar to HSRP


GLBP

Cisco Proprietary, also does load balancing.

Can have host-dependent uses

Weighted routers with both still active.


"Weighting" is used in terms of % of traffic. Below lower limit it is 0%


Configuration

(config)#interface g0/1

(config-if)#glbp 10 ip "192.168.0.1"

(config-if)#glbp 10 preempt

Optional

(config-if)#glbp 10 priority "110"

(config-if)#glbp 10 weighting "50"

(config-if)#glbp 10 weighting "100" lower "50" upper "80"

(config-if)#glbp 10 weighting track "1" decrement "51"

(config)#track 1 interface "g0/2"

(config)#track 2 up route "x.x.x.x/xx" reachability

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