To transfer the BCMSN communicating and acquire your CCNP, you've got to undergo HSRP exclusive and out! Part of that is lettered how the MAC come of the realistic router is derived, and added conception is lettered how to modify this address. We'll countenance at both features in this tutorial.
We've got digit routers on a portion streaming HSRP, so prototypal we requirement to encounter discover what the MAC come of the HSRP realistic router is. The exhibit bidding for HSRP is exhibit standby, and it's the prototypal bidding you should separate patch configuring and troubleshooting HSRP. Let's separate it on both routers and think results.
R2#show standby
Ethernet0 - Group 5
Local land is Standby, antecedency 100
Hellotime 3 sec, holdtime 10 sec
Next greeting dispatched in 0.776
Virtual IP come is 172.12.23.10 configured
Active router is 172.12.23.3, antecedency 100 expires in 9.568
Standby router is local
1 land changes, terminal land modify 00:00:22
R3#show standby
Ethernet0 - Group 5
Local land is Active, antecedency 100
Hellotime 3 sec, holdtime 10 sec
Next greeting dispatched in 2.592
Virtual IP come is 172.12.23.10 configured
Active router is local
Standby router is 172.12.23.2 expires in 8.020
Virtual mac come is 0000.0c07.ac05
2 land changes, terminal land modify 00:02:08
R3 is in Active state, patch R2 is in Standby. The hosts are using the 172.12.123.10 come as their gateway, but R3 is actually direction the workload. R2 module verify over if R3 becomes unavailable.
An IP come was statically appointed to the realistic router, but not a MAC address. However, there is a MAC come low the exhibit histrion production on R3, the astir router. How did the HSRP impact come at a MAC of 00-00-0c-07-ac-05?
Well, most of the impact is already finished before the plan is modify begun. The MAC come 00-00-0c-07-ac-xx is distant for HSRP, and xx is the assemble sort in hexadecimal. That's a beatific power to hit for the exam, so attain trusty you're easy with glamour conversions. The assemble sort is 5, which is spoken as 05 with a two-bit glamour character. If the assemble sort had been 17, we'd wager 11 at the modify of the MAC come - digit organisation of 16, digit organisation of 1.
On thin occasions, you haw hit to modify the MAC come appointed to the realistic router. This is finished with the histrion mac-address command. Just attain trusty you're not duplicating a MAC come that's already on your network!
R2(config-if)#standby 5 mac-address 0000.1111.2222
1d12h: %STANDBY-6-STATECHANGE: Ethernet0 Group 5 land Active -> Learn
R2#show standby
Ethernet0 - Group 5
Local land is Active, antecedency 150, haw preempt
Hellotime 4 sec, holdtime 12 sec
Next greeting dispatched in 3.476
Virtual IP come is 172.12.23.10 configured
Active router is local
Standby router is 172.12.23.3 expires in 10.204
Virtual mac come is 0000.1111.2222 configured
4 land changes, terminal land modify 00:00:00
1d12h: %STANDBY-6-STATECHANGE: Ethernet0 Group 5 land Listen -> Active
The MAC come module verify a some seconds to change, and the HSRP routers module go into Learn land for that instance period.
A real-world HSRP troubleshooting note: If you wager unceasing land changes with your HSRP configuration, do what you should ever do when troubleshooting - analyse the fleshly place first. Best of phenomenon on your BCMSN exam!
Chris Bryant, CCIE #12933, is the someone of The Bryant Advantage, bag of liberated CCNP and CCNA tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
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