FHRP
- First Hop — reference to the default router being the first router, or first router hop, through which a packet must pass.
|
Acronym |
Full Name |
Origin |
Redundancy Approach |
Load Balancing |
|
HSRP |
Hot Standby Router Protocol |
Cisco |
Active/Standby |
Per subnet |
|
VRRP |
Virtual Router Redundancy Protocol |
RFC 5798 |
Active/Standby |
Per subnet |
|
GLBP |
Gateway Load Balancing Protocol |
Cisco |
Active/Standby |
Per host |
-
Configure HSRP
-
R1
-
Int gi0/0
- Ip address 10.1.1.9 255.255.255.0
- Standby version 2
-
-
- Standby 1 ip 10.1.1.1
- Standby 1 priority 110
- Standby 1 name HSRP-group-for-book
-
# Standby preempt to negotiate to become the active router when it comes back up.
-
R2
-
Int gi0/0
- Ip address 10.1.1.129 255.255.255.0
- Standby version 2
- Standby 1 ip 10.1.1.1
- # default priority is 100, higher priority wins
- Standby 1 name HSRP-group-for-book
-
-
Show standby brief
- Interface, Grp (HSRP group), Pri, state, virtual ip
- Version
|
Feature |
Version 1 |
Version 2 |
|
IPv6 support |
No |
Yes |
|
Smallest unit for Hello timer |
Second |
Millisecond |
|
Range of group numbers |
0..255 |
0..4095 |
|
MAC address used (xx or xxx is the hex group number) |
0000.0C07.Acxx |
0000.0C9F.Fxxx |
|
IPv4 multicast address used |
224.0.0.2 |
224.0.0.102 |
|
Does protocol use a unique identifier for each router? |
No |
Yes |
Ip helper-address for DHCP relay
