Three options available in Cisco routers : Solution : Build another generic tunnel over IPSEC. Enabling dynamic routing protocols such as OSPF or EIGRP requires multicast or brodcast support to allow hellos and updates traffic between routers. The IP packets are transiting through Router0 (192.168.1.A major problem with IPSec sessions is that they do not support multicast or broadcast traffic. Ping, traceroute and arp commands issued on Laptop0 confirms that the configuration is working. Both routers detected each other correctly but the priority seems to be wrong ( Standby router is 192.168.1.3, priority 120 should be Standby router is 192.168.1.3, priority 100 on Router0 ) The same configuration without the standby x priority 120 configuration on Router0 does not work and Router1 assumes the active state because it has a higher IP address configured. This router will always assume HSRP active state when it's online and if it has the highest HSRP priority in the network. Preemption is configured on Router0 using the standby X preempt commands. Router1 with HSRP default priority (100)Ĭisco ISR routers configuration Router0 configuration.Router0 with priority 120 (preemption enabled).Two HSRP groups are configured on the ISR routers : Two network are configured for this tutorial : HSRP configuration using Cisco 2911 ISR routers standby preempt Overthrow lower priority Active routers.standby ip Enable HSRP and set the virtual IP address.

The following IOS commands are available : HSRP preemption and interface tracking are supported in Packet Tracer 7.2.1

This protocol can be configured on every Cisco router available in Packet Tracer as well as on Cisco Catalyst 3560 layer 3 switch. HSRP feature has been introduced in Packet Tracer 6.0. The multicast address has been changed because of a conflict with CGMP (Cisco Group Management Protocol) which helps to direct multicast traffic but also uses 224.0.0.2 multicast address Multicast address : HSRP v1 uses 224.0.0.2 whereas HSRP v2 now uses 224.0.0.102.Group numbers range, which has been increaed to 4096 groups (0 to 4095) in HSRP v2.

In HSRP v2,the value is adverdised to make sure that the timer configuration is consistent accross the members of a standby group.

Millisecond timer values, which were not advertised by HSRP v1.

HSRP v1 & v2 share a lot of similarities, like the core functions of HSRP, but HSRP v2 brings some protocol improvements you need to be aware as a network engeneer :

Layer 2 nat example cisco packet tracer