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| beenframed 2001-12-04, 9:46 am |
| I am setting up HSRP with some 3662 and need some clarification on what the HSRP floating ip's mac address will be. Here is what I found on Cisco site.
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HSRP Standby IP Address Communication (All Media Except Token Ring)
Since host workstations are configured with their default gateway as the HSRP standby IP address, hosts must communicate with the MAC address associated with the HSRP standby IP address. This MAC address will be a virtual MAC address composed of 0000.0c07.ac**, where ** is the HSRP group number in hexadecimal based on the respective interface. For example, HSRP group one will use the HSRP virtual MAC address of 0000.0c07.ac01. Hosts on the adjoining LAN segment use the normal ARP process to resolve the associated MAC addresses.
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Is the MAC address automatically generated once the HSRP comes up or do I need to define it?
-bf | |
| MadChef 2001-12-04, 11:19 am |
| quote:
Originally posted by beenframed
Is the MAC address automatically generated once the HSRP comes up or do I need to define it?
It is automagically generated and requires no input from you. That's an interesting bit on how the MAC is derived, though. I didn't know that.
MadChef | |
| strikeattack 2001-12-04, 12:28 pm |
| MadChef is correct, you do not need to generate the MAC address, as it is handled by the IOS automatically. I wonder if you could force a different MAC address if you wanted to though... | |
| darthfeces 2001-12-04, 12:35 pm |
| mfsc1#sh int vlan1
Vlan1 is up, line protocol is up
Hardware is Cat6k RP Virtual Ethernet, address is 00d0.0486.83fc (bia 00d0.0486.83fc)
Description: Network Management VLAN
i believe that a mac can be configured on **any**
interface which is why you have (bia) | |
| darthfeces 2001-12-04, 12:45 pm |
| .1 is hsrp address
.2 - .3 are actual rsm interfaces
mfsc1#
mfsc1#sh ip arp 172.16.1.1
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.1.1 220 0000.0c07.ac00 ARPA Vlan1
mfsc1#sh ip arp 172.16.1.2
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.1.2 210 00d0.0487.2bfc ARPA Vlan1
mfsc1#sh ip arp 172.16.1.3
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.1.3 - 00d0.0486.83fc ARPA Vlan1
mfsc1# | |
| MadChef 2001-12-04, 3:09 pm |
| quote:
Originally posted by strikeattack
I wonder if you could force a different MAC address if you wanted to though...
To do this for HSRP, the command is:
standby [group number] mac-address xxxx.xxxx.xxxx
MadChef |
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