CCNP Certification / BCMSN Exam Tutorial: Getting Started With HSRP
Defined in RFC 2281, HSRP is actually a Cisco-proprietary protocol wherein routers are place into an HSRP router team. Along with dynamic routing protocols and STP, HSRP is taken into account a higher-availability community provider, because all three have an Nearly immediate cutover into a secondary route when the first route is unavailable.
One of many 사설사이트 routers is going to be picked as the first (“Active”, in HSRP terminology), Which Most important will cope with the routing while the opposite routers are in standby, ready to manage the load if the principal router gets unavailable. In this fashion, HSRP assures a large community uptime, as it routes IP website traffic with out depending on one router.
The hosts working with HSRP as being a gateway don’t know the actual IP or MAC addresses of your routers while in the group. They’re communicating with a pseudorouter, a “virtual router” established through the HSRP configuration. This virtual router can have a virtual MAC and IP adddress also.
The standby routers aren’t just going to be sitting there, nevertheless! By configuring various HSRP groups on a single interface, HSRP load balancing is usually achieved.
In advance of we get to the more Innovative HSRP configuration, we improved get a basic one began! We’ll be employing a two-router topology here, and keep in mind that a person or equally of these routers could be multilayer switches likewise. For simplicity of reading, I’m likely to confer with them only as routers.
R2 and R3 will both be configured to get in standby team 5. The virtual router could have an IP deal with of 172.twelve.23.10 /24. All hosts in VLAN a hundred need to use this handle as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.12.23.ten
R3(config)#interface ethernet0
R3(config-if)#standby five ip 172.twelve.23.10
The show command for HSRP is display standby, and it’s the 1st command you need to operate although configuring and troubleshooting HSRP. Allow’s run it on equally routers and Examine effects.
R2#display standby
Ethernet0 – Team 5
Regional condition is Standby, precedence one hundred
Hellotime 3 sec, holdtime 10 sec
Future hi despatched in 0.776
Virtual IP handle is http://www.bbc.co.uk/search?q=토토사이트 172.twelve.23.10 configured
Active router is 172.twelve.23.3, priority one hundred expires in nine.568
Standby router is nearby
one point out improvements, very last point out modify 00:00:22
R3#clearly show standby
Community point out is Active, priority 100
Subsequent hi sent in two.592
Lively router is area
Standby router is 172.12.23.2 expires in 8.020
Digital mac tackle is 0000.0c07.ac05
two condition variations, past state adjust 00:02:08
We will see that R3 has been selected because the Active router (“local point out is Lively”), the Digital router’s IP is 172.twelve.23.ten, and R2 may be the standby router.
There are some HSRP values you’ll need to have to change on occasion. Let's say we wish R2 to be the Active router as an alternative? Can we change the MAC address in the virtual router? I’ll solution These concerns in the following section of this HSRP tutorial!