CCNP Certification / BCMSN Examination Tutorial: Getting Started With HSRP
Outlined in RFC 2281, HSRP is a Cisco-proprietary protocol in which routers are set into an HSRP router group. Coupled with dynamic routing protocols and STP, HSRP is considered a superior-availability network support, given that all 토토검증 a few have an Pretty much instant cutover to the secondary route when the principal route is unavailable.
Among the list of routers will be selected as the key (“Lively”, in HSRP terminology), and that Major will cope with the routing whilst another routers are in standby, Prepared to handle the load if the first router results in being unavailable. On this style, HSRP makes certain a high community uptime, because it routes IP visitors with out depending on an individual router.
The hosts utilizing HSRP for a gateway don’t know the actual IP or MAC addresses with the routers from the team. They’re speaking by using a pseudorouter, a “virtual router” developed through the HSRP configuration. This virtual router should have a virtual MAC and IP adddress too.
The standby routers aren’t just gonna be sitting down there, while! By configuring many HSRP teams on an individual interface, HSRP load balancing can be reached.
Ahead of we reach the greater Innovative HSRP configuration, we superior receive a basic a single commenced! We’ll be using a two-router topology below, and Remember that a person or both equally of those routers can be multilayer switches at the same time. For simplicity of looking at, I’m about to confer with them only as routers.
R2 and R3 will the two be configured to generally be in standby group five. The Digital router will likely have an IP handle of 172.12.23.10 /24. All hosts in VLAN 100 should really use this address as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.twelve.23.10
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.twelve.23.10
The exhibit command for HSRP is display standby, and it’s the main command you'll want to run whilst configuring and troubleshooting HSRP. Permit’s run it on each routers and Look at effects.
R2#display standby
Ethernet0 – Group five
Nearby point out is Standby, priority one hundred
Hellotime 3 sec, holdtime ten sec
Next hello sent in 0.776
Digital IP address is 172.twelve.23.ten configured
Active router is 172.twelve.23.3, priority a hundred expires in nine.568
Standby router is neighborhood
1 condition alterations, previous condition change 00:00:22
R3#show standby
Nearby condition is Lively, precedence 100
Next hello despatched in 2.592
Energetic router is regional
Standby router is 172.twelve.23.2 expires in 8.020
Digital mac address is 0000.0c07.ac05
two point out adjustments, final condition transform 00:02:08
We can see that R3 has become picked as being the Lively router (“community point out is Energetic”), the Digital router’s IP is 172.12.23.10, and R2 is definitely the standby router.
There are numerous HSRP values that you just’ll require to change once in a while. Imagine if we wish R2 for being the Energetic router alternatively? Can we alter the MAC handle on the virtual router? I’ll reply People inquiries in another component of the HSRP tutorial!