Preemption: HSRP Preemption enables the router with the highest priority to immediately become the Active router.Version 2: Multicast address is0.0.102 and uses the UDP port 1985.Version 1: Multicast address is0.0.2 and uses the UDP port 1985.Group number range from0–255.In tie breaking situation highest IP address wins. Priority field is used in election process of active and standby routers. Virtual IP: This IP used by group virtual IP to forward traffic from LAN.Virtual MAC address:MAC address is created by HSRP internal mechanism.Standby group: Set of routers that participate in HSRP.An address should only be learned if no address was configured and the Hello message is authenticated. If the virtual IP address is not configured on a router, then it may be learned from the Hello message from the active router. The virtual IP address used by this group. If no authentication data is configured, the RECOMMENDED default value is 0圆3 0圆9 0x73 0圆3 0圆F 0x00 0x00 0x00. This field contains a clear text of 8 character reused password. This field identifies the standby group between 0 to 255. In tie breaking situation, highest IP address wins. Priority field is used in election process the active and standby routers.
Hold time the interval between the receipt of a hello message and the presumption that the sending router has failed after 10 sec.ĭefault priority is 100. The interval between successive HSRP hello messages from a given router is a 3 sec. Standby – This is the state of a device that is prepared to take over the traffic forwarding duties from the active device. Speak – This is the state of a device that is sending and receiving hello messages.Ħ. Listen – This is the state of a device that is receiving hello messages.ĥ. Learn – This is the state of a device that has not yet determined the virtual IP address and has not yet seen a hello message from an active device.Ĥ. Init or Disabled – This is the state of a device that is not yet ready or able to participate in HSRP.ģ. Active – This is the state of the device that is actively forwarding traffic.Ģ. The router is no longer the active router.ġ. The HSRP is running and is capable of becoming the active or standby router. Hot Standby Router Protocol ( HSRP) Packet If active router fails, the Standby router takes up all the responsibilities of the active router and forwards the traffic. All the routers in a HSRP group share a single MAC address and IP address, which acts as a default gateway to the local network. HSRP allows you to configure routers as standby and only a single router as active at a time. In this case, two or more routers give an illusion of a virtual router. Hot Standby Router Protocol (HSRP) is a CISCO proprietary protocol, provides a mechanism which is designed to support non-disruptive failover of IP traffic in certain circumstances. Related – HSRP vs VRRP Definition of HSRP
Below are the 3 types of FHRP technology:. We implement a first hop redundancy protocol to deal with gateway redundancy. In the event of a router failure, there’s a backup device that will kick in and transparent to their users, continue to forward traffic to remote networks, thus avoiding the situation of isolation. First Hop Redundancy protocols (FHRP) will allow default gateway redundancy, it means provision of having more than one default gateway. From the client’s perspective if the gateway goes down, then access to an entire network will go down. With this understanding, First Hop Redundancy Protocols was developed and employed in majority of network to provide resiliency, availability and redundancy. Modern network requires an important consideration to deal with the network failure. Network resiliency is key component of network design. We will cover following points:- Topic Content In this article, we will discuss on HSRP protocol, related terminologies, its operation and configuration.
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