Explanation/Reference:
Explanation:
The following two statements are TRUE:
HSRP works only on Cisco routers and VRRP works on both Cisco and non- Cisco routers.
HSRP-enabled routers need to be configured manually to preempt the active router and VRRP-enabled
routers preempt it automatically.
HSRP was developed by Cisco intended for only Cisco routers and VRRP was developed by IEFT
intended as a standard for routers. HSRP was defined in RFC 2281 and VRRP was defined in RFC 2338.
Both these protocols provide a fault tolerance solution by grouping several routers together but presenting
them as a single router. One of the routers in the group acts as the active or master router. A second
router is selected as the standby router. In case the active or master router fails, the standby router takes
over the responsibilities of the active router.
The router with the highest priority is automatically selected as the active or master router. In HSRP,
preempt settings have to be manually configured on every router in the group, even if the routers have a
priority higher than that of the active router. However, in VRRP, the routers with higher priority
automatically preempt the master router. Another advantage that VRRP has over HSRP is a faster Hello
timer (1 second). HSRP has a Hello timer of 3 seconds
Two other protocols ICMP Router Discovery Protocol (IRDP) and Gateway Load Balancing Protocol
(GLBP) provide redundancy for first-hop router failure. IRDP also allows the selection of a new router if the
active router fails, while GLBP provides load balancing in addition to redundancy.
Objective:
Infrastructure Services
Sub-Objective:
Configure and verify first-hop redundancy protocols
References:
Home > Articles > Cisco Certification > CCDP > CCDP Self Study: Designing High-Availability Services
Cisco First Hop Redundancy Protocols Configuration Guide, Cisco Release 15MT