06-02-2009 11:32 AM - edited 03-04-2019 04:58 AM
I have two routers and have HSRP running between the fast ethernet interfaces. Actually there are two groups running. RTR_A real IP is .1 and it is Active for .3 (group 1). RTR_B real IP is .2 and it is Active for the .4 address (group 2). I want to remove one of the groups. Anyone know how I can see if the .4 virtual is being used as a default gateway by a client?
06-02-2009 11:44 AM
I would use a sniffer if I expect to see heavy load of ARP request.
"debug arp" would also help...but I simply would not dare :-)
Sam
06-02-2009 12:11 PM
These are on our internet routers, so no debug of course. Sniffer might be OK, but I was hoping for some magical command I didn't know.
06-02-2009 12:20 PM
I just did a debug on arp in the lab and it shows physical interfaces, not virtuals :-(
06-02-2009 12:27 PM
I got both IP and MAC, perhaps we have different setup and configs.
*Mar 18 11:25:43.803: IP ARP: sent req src 10.1.1.1 cc01.12f4.0010,
dst 10.1.1.2 cc02.12f4.0010 FastEthernet1/0
06-02-2009 12:29 PM
I did too, but it shows the physical interface instead of the virtual interface.
06-02-2009 01:46 PM
Hi Collin,
You may wan to use mac address input accounting on Router B to get all MACs that sent frames to the interface.
int <>
ip accounting mac-address input
sh int <> mac-accounting
-Rakesh
06-03-2009 05:20 AM
Rakesh,
Thanks for the pointer. I'll lab it up and see if it gives me the info I need.
06-03-2009 05:35 AM
Rakesh,
We're getting closer. I enabled accounting, sent some traffic, but the command show interface VLAN1 mac-acc shows the source MACs destined for the VLAN1 interface. That's works, but I may have clients pointing directly to the physical interface. Thanks for the command.
06-03-2009 06:14 AM
No problem :-)
-Rakesh
06-02-2009 02:36 PM
How can you determine that? A Client would have this information statically or dynamically within its TCP/IP information so what's to say this client hasn't be used for 2 weeks because the user was on vacation?
I'm afraid this request is not possible to accomplish without some leg work or having some technical support calls.
__
Edison.
06-02-2009 03:50 PM
Hi Edison,
The command can be used to get a fair idea of the number of MACs sending traffic to router's interface. If we have just 2 routers and hosts, and if group 2 is active on Router B and no client is using .4, you shouldn't see any traffic right ?
It may or may not help depending on what else is going on in the LAN.
-Rakesh
06-02-2009 04:04 PM
Rakesh,
Sorry for any confusion but I didn't reply to you but to Collin. I suggest to view these posts in a threaded format.
___
Edison.
06-02-2009 04:09 PM
Hi Edison,
No problem, point taken :-)
-Rakesh.
06-03-2009 05:23 AM
PUBLIC NETWORK. There are no clients that haven't been used for two weeks. Please read and understand before posting.
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