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FHRP (Common Features (Two act as one (Virtual IP address, Virtual MAC…
FHRP
Common Features
Two act as one
Virtual IP address
Virtual MAC address
Primary/backup
Higher priority is primary
Pre-empt: usurp primary role
Transparent to client
ARP cache on PC lasts 5 minutes
FHRP responds to ARP using a virtual MAC
Interface Tracking
Decrement priority if a WAN link fails
Use keepalives
VRRP
Master and Backup
Can assign virtual IP address to master
Default timers: 1/3
Cisco
HSRP
Active and Standby
Default Timers: 3/10
Requires separate virtual IP address
GLBP
Split Active (Both respond to requests)
Virtually identical to HSRP
Spanning Tree
Eliminate STP
Local VLANs
Layer 3 between distribution switches
Prune trunks
Using STP
Root bridge matches FHRP primary
GLBP
Block link between FHRPs on backup
(config-if)#spanning-tree cost 2000
Layer 2 between distribution switches