CCNP Certification / BCMSN Examination Tutorial: Getting going With HSRP
Defined in RFC 2281, HSRP is often a Cisco-proprietary protocol during which routers are set into an HSRP router team. Along with dynamic routing protocols and STP, HSRP is taken into account a significant-availability community provider, due to the fact all 3 have an Just about instant cutover to your secondary route when the key path is unavailable.
One of several routers will likely be picked as the key (“Lively”, in HSRP terminology), Which primary will tackle the routing when the opposite routers are in standby, Completely ready to manage the load if the first router gets unavailable. On this fashion, HSRP makes sure a substantial network uptime, as it routes IP website traffic with out depending on an individual router.
The hosts utilizing HSRP to be a gateway don’t know the actual IP or MAC addresses of your routers during the group. They’re communicating with a pseudorouter, a “virtual router” developed with the HSRP configuration. This virtual router will have a virtual MAC and IP adddress in addition.
The standby routers aren’t just destined to be sitting down there, though! By configuring several HSRP teams on one interface, HSRP load balancing is usually reached.
Prior to we get to the greater Sophisticated HSRP configuration, we much better obtain a essential one particular started out! We’ll be utilizing a two-router topology here, and Remember that one or equally of these routers can be multilayer switches at the same time. For relieve of examining, I’m planning to consult with them only as routers.
R2 and R3 will both be configured to be in standby group 5. The Digital router could have an IP address of 172.twelve.23.ten /24. All hosts in VLAN a hundred really should use this deal with as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.twelve.23.ten
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.twelve.23.ten
The exhibit command for HSRP is present standby, and it’s the main command you need to operate though configuring and troubleshooting HSRP. Enable’s operate https://en.wikipedia.org/wiki/?search=토토사이트 it on both of those routers and Examine results.
R2#clearly show standby
Ethernet0 – Group five
Neighborhood state is Standby, priority 100
Hellotime 3 sec, holdtime ten sec
Following hello there despatched in 0.776
Digital IP deal with is 172.twelve.23.10 configured
Active router is 172.twelve.23.three, precedence one hundred expires in nine.568
Standby router is area
1 state alterations, past condition alter 00:00:22
R3#present standby
Community condition is Energetic, priority 100
Upcoming good day despatched in 2.592
Lively router is regional
Standby router is 172.twelve.23.two expires in 8.020
Digital mac tackle is 0000.0c07.ac05
2 point out changes, previous point out change 00:02:08
We can see that R3 has long been chosen as the Active router (“regional condition is Energetic”), the virtual router’s IP is 172.twelve.23.10, 메이저사이트 and R2 may be the standby router.
There are numerous HSRP values that you simply’ll require to alter every now and then. Imagine if we would like R2 to become the Energetic router instead? Can we change the MAC tackle of your Digital router? I’ll reply People queries in the next element of the HSRP tutorial!