To earn your CCNP certification and pass the BCMSN exam, you've got to know what HSRP does and the many configurable options. While the operation of HSRP is quite simple (and covered in a previous tutorial), you also need to know how HSRP arrives at the MAC address for the virtual router - as well as how to configure a new MAC for this virtual router. This puts us in the unusual position of creating a physical address for a router that doesn't exist!
Laptop Battery The output of show standby for a two-router HSRP configuration is shown below.
7100 (one of the microphones that came with ViaVoice) in the past and found it did not meet our certification requirements. Previous testing was done on versions of Mac OS X prior to version 10.4.9. Apple made some changes to how USB Audio is handled in Mac OS X version 10.4. test many microphones that did not meet our certification requirements in past tests. 7100 has passed our certification requirements, but only for computers that are using Mac OS X version 10.4.9 or later.
Thinkpad R2#show standby
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Microsoft Ethernet0 - Group 5
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Laptop Computers Local state is Standby, priority 100
It also provides a practice exam that includes questions in a format similar to the certification exam.
Laptop Computer Hellotime 3 sec, holdtime 10 sec
However, in some States those who pass the national exam are exempt from taking a State certification exam.
Desktop Computer Next hello sent in 0.776
Notebooks Virtual IP address is 172.12.23.10 configured
Lenovo Active router is 172.12.23.3, priority 100 expires in 9.568
Hard Drive Standby router is local
Travelstar 1 state changes, last state change 00:00:22
Gateway R3#show standby
Laptop Parts Ethernet0 - Group 5
Software Local state is Active, priority 100
Hard Drives Hellotime 3 sec, holdtime 10 sec
Electronics Next hello sent in 2.592
Canon Virtual IP address is 172.12.23.10 configured
Desktop Pc Active router is local
Desktop Computers Standby router is 172.12.23.2 expires in 8.020
Think Pad Virtual mac address is 0000.0c07.ac05
Repair 2 state changes, last state change 00:02:08
Data Recovery R3 is in Active state, while R2 is in Standby. The hosts are using the 172.12.123.10 address as their gateway, but R3 is actually handling the workload. R2 will take over if R3 becomes unavailable.
Cisco An IP address was assigned to the virtual router during the HSRP configuration process, but not a MAC address. However, there is a MAC address under the show standby output on R3, the active router. How did the HSRP process arrive at a MAC of 00-00-0c-07-ac-05?
Keyboard Well, most of the work is already done before the configuration is even begun. The MAC address 00-00-0c-07-ac-xx is reserved for HSRP, and xx is the group number in hexadecimal. That's a good skill to have for the exam, so make sure you're comfortable with hex conversions. The group number is 5, which is expressed as 05 with a two-bit hex character. If the group number had been 17, we'd see 11 at the end of the MAC address - one unit of 16, one unit of 1.
Monitor The output of the show standby command also tells us that the HSRP speakers are sending Hellos every 3 seconds, with a 10-second holdtime. These values can be changed with the standby command, but HSRP speakers in the same group should have the same timers. You can even tie down the hello time to the millisecond, but it's doubtful you'll ever need to do that.
Desktop R3(config-if)#standby 5 timers ?
Infosys <1-254> Hello interval in seconds
Refurbished Laptops msec Specify hello interval in milliseconds
Wipro R3(config-if)#standby 5 timers 4 ?
Lap Top <5-255> Hold time in seconds
Refurbished R3(config-if)#standby 5 timers 4 12
Memory Another important HSRP skill is knowing how to change the Active router assignment. I'll show you how to do that, and how to configure HSRP interface tracking, in the next part of my CCNP / BCMSN exam tutorial!
Intel
As400 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, and CCNA CBT video training. Pass the CCNA exam ,BSCI exam , and BCMSN exam with Chris Bryant, CCIE #12933!
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