Filter
Top Products
C
ONFIGURING
R
OUTER
R
EDUNDANCY
3-241
- HSRP advertisements from the master and standby virtual router
include information about their priority, timer values, and current
state as the master or standby router.
- Routers on which the timer settings have not been configured can
learn the current timer values from the master or standby router.
Timers configured on the master router always override any other
timer settings. All routers in an HSRP group should be configured
with the same timer values.
- HSRP advertisements are sent to the multicast address 224.0.0.2.
Using a multicast address reduces the amount of traffic that has to
processed by network devices that are not part of the designated
HSRP group.
•Holdtime – Time before the master or standby router is declared
down. (Range: Hellotime+1 to 255 seconds; Default: 10 seconds)
- If the master router stops sending advertisements, backup routers
will bid to become the master based on priority. The hold time
before declaring a router dead should be normally be set to a value
3 times or more than the hello time.
• Preempt Mode – Allows a backup router to take over as the master
virtual router if it has a higher priority than the acting master virtual
router
. (Default: Disabled)
• Preempt Delay – Time to wait before issuing a claim to become the
master. (Range: 0-3600 seconds; 0 seconds)
• Priority – Priority of this router in an HSRP group. (Range: 1-255;
Default: 100)
• Authentication String – Key used to authenticate HSRP packets
received from other routers. (Range: 1-8 alphanumeric characters)
- All routers in the same HSRP group must be configured with the
same authentication string. When a HSRP packet is received from
another router in the group, its authentication string is compared