Comparison of HSRPv1 and HSRPv2
HSRPv1 has default values ranging from 0 to 255 while values for HSRPv2 ranges from 0 to 4095. The virtual MAC address for HSRPv1 is 0000. 0C07.ACXX (XX=HSRP) while the virtual MAC address for HSRPv2 is 0000. 0C9F.FXXX (XX=HSRP) (CISCO Systems, 2006). Hello packets of HSRPv1 are sent to multicast address 224.0.0.2 while those for virtual MAC address for HSRPv1 are sent to multicast address 224.0.0.102. The millisecond timer values for virtual HSRPv1 are not learned or advertised while those for HSRPv2 are learned and advertised (“CISCO Systems”, 2006). The HSRPv1 does not use HSRP active hello messages to isolate the router that sent the message since the source MAC address is the HSRP virtual MAC address. In contrast, HSRPv2 allows enhanced management and troubleshooting.
How HSRP Functions
HSRP operates in six possible states; initial, learn, listen, speak, standby and active states. In the Listen state, the router listens for messages from the standby router or active router (Ur Rahman et al. 2017). Availability of messages in the active and standby router compels the local router to compare its parameters with those in the hello messages. The local router remains in listen state if the parameters of the active and standby router are better. If there are no messages from the active and standby routers, then the local router changes its state to speak and starts to send Hello messages. If several Hello messages are transmitted to the local router, the highest priority router becomes an active router (Ur Rahman et al. 2017). Also if the router’s priorities are same then the router with the highest IP address becomes the active router. The second-best selection of active router is the standby router, if there are two routers in the category then the router that is neither standby nor active goes to the listen state. An active router is replaced by a local router if local priority is higher than the active router and if preemption is not enabled in the local router.
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The Reasons for a New Version OF HSRP (HSRPv2)
The HSRPv2 is designed to solve restrictions in HSRPv1. It allows advertisement and learning of millisecond timer values contrary to version 1, in which millisecond timer values are neither advertised nor learned (Vladimir, 2017). The property of version 2 ensures stability of the HSRP groups in all cases. Also, HSRPv2 allow enhanced management and troubleshooting. HSRPv2 also uses the multicast address 224.0.0.102 to address the conflict of 224.0.0.2 in HSRPv1 (Vladimir, 2017).
References
CISCO Systems. (2006). Hot Standby Router Protocol Features and Functions.
Ur Rahman, Zia & Mukhtar, Safyan & Khan, Sajjad & Khan, Raees & Ullah, Zakir & Rashid, Reena & Ahmad, Waqas. (2017). Performance Evaluation of First HOP Redundancy Protocols (HSRP, VRRP & GLBP). Journal of Applied Environmental and Biological Sciences. 7. 268-278.
Vladimir V, J. H. (2017). First Redundancy Protocols in Omnet ++. A New FRIRPSs Available in ANSAINET .
