Virtual IP address and virtual MAC are active on the HSRP Active router.
3 sec hello, 10 sec dead
224.0.0.2 – V1
224.0.0.102 – V2
Virtual MAC of 0000.0C07.ACxx(v1)
Virtual MAC of 0000.0c9f.fxxx for IPv4 (v2) and 0005.73a0.0xxx for IPv6 (v2)
Port UDP 1985 for IPv4
Port UDP 2029 for IPv6
Clear-text & MD5 auth
MHSRP (administrative LB)
Only 1 standby, highest IP preemts standby.
VRRP
IP protocol number 112; TTL 255 – MUST
224.0.0.18
1 sec hello, 3 sec dead
Virtual MAC of 0000.5E00.01xx
Preempts by default
Group IP address is the interface IP address of one of routers (prio for the router will be 255)
Higest IP preempts; more than 1 standby
The priority value zero (0) has special meaning indicating that the current Master has stopped participating in VRRP. Backups quickly transition to master.
GLBP
UDP 3222
224.0.0.102
3 sec hello, 10 sec dead
0007.B400.xxyy , where xx is the GLBP group number and yy is a different number for each router (01, 02, 03, or 04).
1024 GLBP groups per physical interface and up to four AVF per GLBP group
If multiple gateways have the same priority (1-255), the gateway with the highest real IP address becomes the AVG; standby AVG election – same principle.
The Redirect timer (600 sec) determines how long will AVG continue to respond to ARP requests with the virtual MAC of the failed AVF. The Secondary Hold(4 hours, 14400 sec) timer sets the amount of time the backup AVF will continue to accept packet for the virtual MAC address taken from the failed AVF.