CCNP Certification / BCMSN Exam Tutorial: Getting Started With HSRP

Defined in RFC 2281, HSRP is a proprietary protocol from Cisco routers, in which a group HSRP router. Together with dynamic routing protocols and STP, HSRP is a high availability network service, as all three have an almost immediate elimination of a secondary path when the primary path is unavailable.
One the router are considered primary (Active & " quot;, In HSRP terminology), and that is the primary routing, while the other routers are in standby mode, ready to be loaded when the primary router is not available. In this fashion, HSRP guaranteed high network availability, as it routes IP traffic, without a single router.
The host as a gateway with HSRP do not know the actual IP or MAC addresses of the routers in the group. They communicate with a pseudorouter a virtual router " " caused by the HSRP configuration. This virtual router is a virtual MAC and IP address as well.
The standby routers are not only to sit, though! Due to the configuration of HSRP several groups through a single interface, load distribution HSRP achieved.
Before we can to the more advanced HSRP configuration, we get a more fundamental one started! We will work with a two-router topology here, and note that one or both of these routers could also Multilayer Switches. To facilitate reading, I rely on them only as routers.
R2 and R3 will also be configured so that in the standby Group 5 The virtual router is an IP address 172.12.23.10 / 24. All hosts in VLAN-100 should address them as their default values gateway.
R2 (config) interface ethernet0
R2 (config-if) ip 172.12.23.10
R3 standby 5 (config) interface ethernet0
R3 (config-if) ip 5 Standby 172.12 .23.10
The show command is HSRP standby for show, and it is the first command you in configuring and troubleshooting HSRP. Leave it on both routers and compare results.
R2 show standby
Ethernet0 - Group 5
Local standby state, priority 100
Hellotime 3 sec, holdtime 10 sec
Next hi sent in 0.776
Virtual IP address 172.12.23.10 configured
Active router 172.12.23.3, priority 100 runs In 9.568
Standby router local
1 state change, change state 00:00:22
R3 show standby
Ethernet0 - Active Group 5
Local state, priority 100
Hellotime 3 sec, holdtime 10 sec
Next hi sent in 2.592
Virtual IP address 172.12.23.10 configured
Active router local
Standby router 172.12 .23.2 runs in 8.020
Virtual mac address is 0000.0c07.ac05
2 state change, change state 00:02:08
We can see that R3 was selected as the Active router (" local government is Active & quot ;), the virtual router - IP is 172.12.23.10, and R2 is the standby router.
There HSRP are some values that you need in order from time to time. What if we want to be R2 Active router? Can we change the MAC address of the virtual router? I will answer these questions in the next section of this tutorial HSRP!
Chris Bryant, CCIE 12933, is the owner of The Bryant Advantage (http://www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, the Ultimate CCNA Study Package, Ultimate CCNP Study Packages, CCNA CBT and Video training. Pass for the CCNA exam, BSCI exam, and BCMSN exam with Chris Bryant, CCIE 12933!
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