Difference between HSRP, VRRP and GLBP Protocols
Protocol Features
|
HSRP
|
VRRP
|
GLBP
|
Scope
|
Cisco Proprietary
|
IEEE standard
|
Cisco Proprietary
|
Standard
|
RFC 2281
|
RFC 3768
|
none
|
OSI
Layer
|
Layer 3
|
Layer 3
|
Layer 2
|
Load
Balancing
|
No
|
No
|
Yes
|
Multicast
Group IP Address
|
224.0.0.2 in v1
224.0.0.102 in v2
|
224.0.0.18
|
224.0.0.102
|
Transport
Port Number
|
UDP 1985
|
UDP 112
|
UDP 3222
|
Timers
|
Hello 3 sec
|
Advertisement 1 sec
|
Hello 3 sec
|
Hold 10 sec
|
Master down Time= 3xAdvertisement Time+Skew
Time(Skew Time)(256-Priority)/256
|
Hold 10 sec
|
|
Election
|
Active Router:
1. Highest Priority
2. Highest IP
(tie breaker)
|
Master
Router: (*)
1. Highest Priority
2. Highest IP
(tie breaker)
|
Active Virtual Gateway:
1. Highest Priority
2. Highest IP
(tie breaker)
|
Router
Role
|
1. One Active Router, One Standby Router
2. One or more Listening Routers
|
1. One Active Router
2. One or More Backup Routers
|
1. One AVG (Active Virtual Gateway)
2. Up to 4 AVF Routers on the group
(Active Virtual Forwarder) passing traffic.
3. Up to 1024 virtual Routers (GLBP
groups) per physical interface.
|
Preempt
|
If Active Router(Highest Priority) is
down and up again, Preempt should be configured to become a Active Router
again
|
By default Preempt is ON in VRRP, If
Active Router is down and up again, It will automatically become a Master
Router
|
If Active Router(Highest Priority) is
down and up again, Preempt should be configured to become a Active Router
again.
|
Group
Virtual Mac Address
|
0000.0c07.acxx
|
0000.5e00.01xx
|
0007.b4xx.xxxx
|
IPv6
Support
|
Yes
|
No
|
Yes
|
Tracking
|
Yes
|
Yes
|
Yes
|
Time
Adjustments
|
Yes
|
Yes
|
Yes
|
* If the
group VRRP Virtual IP on the master (higher priority) is the real IP configured
on a different VRRP (Backup with lower priority) IOS will manage to make the
VRRP router with the real IP, the master, by setting its priority to 255,
knowing that the configurable range is [1-254].
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