Follow up from our router guru:

 

IOS type looks like the following.

 

csg-gss-sw1(config)#mac-address-table aging-time XXX

 

So that covers both flavors of the Cisco switch IOS’s

 

 

Leslie, hope this helps… it’s not the mib variable but will get you closer:

 

This looks like the command for a CatOs type switch.  It would be different for a IOS type switch.

 

csg-mildc-sw1> (enable) set cam ?

  agingtime                  Set CAM aging time
  dynamic                    Set dynamic CAM entries
  notification               Set MAC address change notification
  permanent                  Set permanent CAM entries
  static                     Set static CAM entries

csg-mildc-sw1> (enable) set cam agingtime ?
  <vlan>                     VLAN number

csg-mildc-sw1> (enable) set cam agingtime XXX

 

A show cam agingtime shows each vlan at 300 sec.  Hopefully there is a way to change it globally instead of per VLAN.

 

 

 

Leslie, I’ve forwarded your question to our router guru.

 

The key difference is that ARP cache is a media layer mechanism for tying an IP address to a MAC address. What you are asking about is tying a bridge number to a MAC address i.e. this bridge has knowledge of this MAC address on this segment number. When he gives me an answer I’ll post it.

 

 

Can anyone tell me the proper terminology to use when asking a Cisco guy to change the age-out time for the forwarding table in the dot1dBridge mib? They think I am talking about the arp cache, but I am not. For Switch Analyzer it is recommended to increase the value from the default of 300 seconds to 900 seconds, and I can tell them the mib variable, but I cannot give them the command in Cisco-ese.

For clarity, the mib variable is:

iso.org.dod.internet.mgmt.mib-2.dot1dBridge.dot1dTp.dot1dTpAgingTime
.1.3.6.1.2.1.17.4.2

Cordially,

Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
Detroit