Since routers have several interfaces with an IP address, all on different network segments, they allow communication between these segments. Instead, it simply is the way we label a process routers normally do. Inter-VLAN routing is not a specific technology or implementation. Explaining Inter-VLAN RoutingД«efore we start the configuration, we may want to pause to completely understand what we are going to do. VLAN IDДЇor each client (PC), the default gateway is the IP address of RoaS in the same VLAN as the client. Use the following tables to understand all the configuration items we are going to work with. In the end, we will take a minute to analyze the routing table and check how the router works for this specific task. Once this is 100% clear, we will move to the configuration part, going very fast on the Layer 2 side we already know about. Configure вЂњRoaSвЂќ Router to do Inter-VLAN Routing for the three VLANs previously createdД«efore we start the configuration, we will present to you the logic of Inter-VLAN routing using a router.

Configure access ports and trunks according to the tables below.

Create three different VLANs with IDs 10, 20 and 35, named respectively вЂњRedвЂќ, вЂњBlueвЂќ and вЂњGreenвЂќ.

To be more specific, hereвЂ™s what we need to do. Consequently, you will need to configure the VLAN part, including trunks, and the Inter-VLAN routing part. However, all network devices are with factory configuration (we just changed the hostname). We already configured for you all 10 PCs with IP address, subnet mask, and default gateway. If you open the Packet Tracer, youвЂ™ll see we called this device just вЂњRoaSвЂќ. Therefore, all traffic that has to go from a VLAN to another, will flow through this router. In case it wasnвЂ™t clear, the only router in the picture is the one we will use for Inter-VLAN routing. The IP packets are transiting through Router0 (192.168.1.This is the topology for this lab, the colored squares represent the VLANs.

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)Д¬isco 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 :

Hsrp and router on a stick 12.4