VRRP/ HSRP output

Answered Question
Apr 21st, 2007
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Hi,

I don?t have access to second level password, and need to design a network.


The two cisco 2610XM Router Details are -

IOS (tm) C2600 Software (C2600-I-M), Version 12.1(16), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2002 by cisco Systems, Inc.


I am confused with the redundancy protocol used in this router.


with command - show standby

i got following output -

R1>sh standby

FastEthernet0/0 - Group 0

Local state is Active, priority 200, may preempt

Hellotime 3 sec, holdtime 10 sec

Next hello sent in 0.526

Virtual IP address is xx.xx.xx.3 configured

Active router is local

Standby router is xx.xx.xx.2 expires in 9.636

Virtual mac address is 0000.0c07.aa00

5 state changes, last state change 1d11h

Priority tracking 1 interface, 1 up:

Interface Decrement State

Serial0/0 20 Up


but as per my observation Whenever HSRP is configured output shows a line -

Hot standby IP address is xx.xx.xx.xx configured


But my output shows a line -

Virtual IP address is xx.xx.xx.xx configured


Not able to make out if HSRP or VRRP.

Is output differ due to IOS Version.

Please Help


Correct Answer by ankbhasi about 10 years 2 months ago

Hi Himanshu,


So now its confirm that HSRP is been configured looking at the virtual mac address.


Now as far as teh output is concern it may be IOS specific because in all latest IOS on L3 switches I see Virtual IP address instead of Host Standby IP Address.


From the virtual mac address which is 0000.0c07.ac00, 07.ac signifies it is Cisco HSRP Mac Addrses and 2 numbers tells you the HSRP group number which is 0 in your case.


HTH


Ankur


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Correct Answer by ankbhasi about 10 years 2 months ago

Hi Friend,


I believe its HSRP but before confirming you can you reconfirm me the same output and check the virtual mac address in the same output


Virtual mac address is 0000.0c07.aa00


You posted 0000.0c07.aa00 but I believe it will be 0000.0c07.ac00, so please reconfirm.


07.ac is virtual mac address signfies it is Cisco prop HSRP mac address.


HTH


Ankur

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Correct Answer
ankbhasi Sat, 04/21/2007 - 10:31
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  • Cisco Employee,

Hi Friend,


I believe its HSRP but before confirming you can you reconfirm me the same output and check the virtual mac address in the same output


Virtual mac address is 0000.0c07.aa00


You posted 0000.0c07.aa00 but I believe it will be 0000.0c07.ac00, so please reconfirm.


07.ac is virtual mac address signfies it is Cisco prop HSRP mac address.


HTH


Ankur

hi2himanshu Sun, 04/22/2007 - 22:58
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Yes the Virtual mac address is 0000.0c07.ac00,

This means the output is because of Cisco IOS version ? / because other IOS version gives output-

Hot standby IP address is xx.xx.xx.xx configured.


Can you provide me more detail on the same.

Thanks

Correct Answer
ankbhasi Mon, 04/23/2007 - 00:03
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  • Cisco Employee,

Hi Himanshu,


So now its confirm that HSRP is been configured looking at the virtual mac address.


Now as far as teh output is concern it may be IOS specific because in all latest IOS on L3 switches I see Virtual IP address instead of Host Standby IP Address.


From the virtual mac address which is 0000.0c07.ac00, 07.ac signifies it is Cisco HSRP Mac Addrses and 2 numbers tells you the HSRP group number which is 0 in your case.


HTH


Ankur


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hi2himanshu Mon, 04/23/2007 - 01:37
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Thanks for the information provided,

Is there default Virtual MAC address for VRRP also.

ankbhasi Mon, 04/23/2007 - 03:47
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  • Cisco Employee,

Hi Himanshu,


The virtual router MAC address associated with a virtual router is an IEEE 802 MAC Address in the following format:


00-00-5E-00-01-{VRID}


The first three octets are derived from the IANA's OUI.


The next two octets (00-01) indicate the address block assigned to the VRRP protocol.


{VRID} is the VRRP Virtual Router identifier.


This mapping provides for up to 255 VRRP routers on a network.


I have myself not done much research on VRRP so to get more details on its operation you can read this link


http://www.faqs.org/rfcs/rfc2338.html


Section 7.3 talks about Virtual Mac Address


HTH


Ankur


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