From: Paresh Khatri (Paresh.Khatri@aapt.com.au)
Date: Thu Dec 08 2005 - 02:22:37 GMT-3
Hi Andrew,
I don't believe that you can use the 'set-attached-bit' command when using ISIS for routing IP; while the ATT bit is also used by IP, you can only set it via this command when routing CLNS via ISIS.
As for the second command, one possible way a question could require you to use this is: configure your interior routers so that they do not advertise themselves as available for transit routing until BGP has converged on these routers. Or: configure your interior routers so that they do advertise themselves as available for transit routing until 2 minutes after the IGP routing process has started.
Here's my little summary of how you can use the set-overload-bit command:
set-overload-bit
' immediately and unconditionally sets the overload bit
set-overload-bit on-startup <seconds>
' sets the overload bit on startup for the specified number of seconds (from 5 to 86400)
set-overload-bit on-startup <seconds> suppress interlevel
' sets the overload bit on startup for the specified number of seconds (from 5 to 86400). Suppresses advertisement of any inter-level routes while the overload bit is set.
set-overload-bit on-startup <seconds> suppress external
' sets the overload bit on startup for the specified number of seconds (from 5 to 86400). Suppresses advertisement of any redistributed routes while the overload bit is set.
set-overload-bit on-startup <seconds> suppress interlevel external
' sets the overload bit on startup for the specified number of seconds (from 5 to 86400). Suppresses advertisement of any inter-level or external routes while the overload bit is set.
set-overload-bit on-startup wait-for-bgp
' sets the overload bit on startup. It's cleared on receiving a signal from BGP or after 10 minutes, whichever comes first.
set-overload-bit on-startup wait-for-bgp suppress interlevel
' sets the overload bit on startup. It's cleared on receiving a signal from BGP or after 10 minutes, whichever comes first. Suppresses advertisement of any inter-level routes while the overload bit is set.
set-overload-bit on-startup wait-for-bgp suppress external
' sets the overload bit on startup. It's cleared on receiving a signal from BGP or after 10 minutes, whichever comes first. Suppresses advertisement of any redistributed routes while the overload bit is set.
set-overload-bit on-startup wait-for-bgp suppress interlevel external
' sets the overload bit on startup. It's cleared on receiving a signal from BGP or after 10 minutes, whichever comes first. Suppresses advertisement of any inter-level or external routes while the overload bit is set.
set-overload-bit suppress interlevel
' immediately and unconditionally sets the overload bit. Suppresses advertisement of any inter-level routes while the overload bit is set.
set-overload-bit suppress external
' immediately and unconditionally sets the overload bit. Suppresses advertisement of any external routes while the overload bit is set.
set-overload-bit suppress interlevel external
' immediately and unconditionally sets the overload bit. Suppresses advertisement of any inter-level or redistributed routes while the overload bit is set.
HTH,
Paresh.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Andrew Lissitz (alissitz)
Sent: Thursday, 08 December 2005 03:01 PM
To: comserv@groupstudy.com; ccielab@groupstudy.com
Subject: ISIS - set-attached-bit and set-overload-bit
Hello group,
I am trying to think of a scenario / question that may cause me to think
of this feature.
pe1(config)#router isis
pe1(config-router)#?
set-attached-bit Conditionally advertise us as attached to L2
set-overload-bit Signal other routers not to use us in SPF
pe1(config-router)#
My lab:
R1 <---> R2 (My lab follows the 'KISS' design guide)
Has anyone used these features and or can think of a question / scenario
that would cause me to look at this feature for the solution. I am
really trying to think of how a question / scenario could be written.
Kindest regards group,
Andrew
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