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IPv6 routing protocols would be ensuring that the router-to-router resilience as well as failover. However, in situations in which the path between a host as well as the first-hop router fails, or the first-hop router itself fails, Then the first-hop redundancy protocol (FHRP) will ensure host to router flexibility and fail over. The GLBP (Gateway Load Balancing Protocol) FHRP would be protecting the data traffic from a failed router or circuit, which would be allowing packet load sharing between a group of redundant routers. The HSRP (Hot Standby Router Protocol) would be protecting the data traffic in case of a gateway failure.
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Prerequisites for First Hop Redundancy Protocols in IPv6
• Before you would be able to configure GLBP, you have to ensure that the routers could support multiple MAC addresses on the physical interfaces. For each and every GLBP forwarder to be configured, an additional MAC address would be utilized.
• Avoid static link-local addressing on interfaces which are configured with GLBP.
• HSRP version 2 would be needed to enable on an interface before HSRP IPv6 could be able to configure.
HSRP for IPv6
The HSRP is considered to be an FHRP which is designed to allow for transparent failover of the first-hop IP router. High network availability would be provided by the HSRP by providing first-hop routing redundancy for IP hosts on Ethernet configured along with a default gateway IP address. HSRP is utilized in a group of routers for selecting an active router as well as a standby router. In a group of router interfaces, the active router is considered to be the router of choice for routing packets; the standby router is considered the router that takes over when the active router would be failing or when preset conditions are met.
IPv6 hosts would be learning of available IPv6 routers throughout IPv6 neighbor discovery RA messages. These are multicast periodically, or might be solicited by hosts. HSRP is going to be designed to provide only a virtual first hop for IPv6 hosts.
An HSRP IPv6 group would have a virtual MAC address that would be derived from the HSRP group number, as well as a virtual IPv6 link-local address that is, by default, going to be derived from the HSRP virtual MAC address. Periodic RAs would be sent for the HSRP virtual IPv6 link-local address when the HSRP group is considered active. These RAs stop after a final RA is being sent when the group leaves the active state.
Periodic RAs for the interface link-local address stop later than a final RA is sent while at least one virtual IPv6 link-local address is needed to be configured on the interface. No restrictions would have occurred for the interface IPv6 link-local address other than which would be mentioned for the RAs. Other protocols continue to receive as well as send packets to this address.
HSRP would be utilizing a priority mechanism to determine which HSRP configured router is going to be the default active router. To configure a router as the active router, you are required to assign it a priority that would be higher than the priority of all the other HSRP-configured routers. The default priority is considered to be 100, so if you have to configure just one router to have a higher priority, that router is going to be the default active router.
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