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vinay_2260
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ISIS Dynamic overload bit.

Sun Jul 01, 2012 11:55 pm

Hi,

Did Cisco implement the ISIS dynamic overload bit.

when i referred the below link

http://www.cisco.com/en/US/tech/tk365/t ... 4bb1.shtml
under the section "Traditional use of overload bit" i found that they are using the overload bit in case of router runs out of system resources (memory or CPU).

But when i tried to test this feature on the CISCO box,

CISCO-1#show version
Cisco IOS Software, 3600 Software (C3660-JS-M), Version 12.4(2)T1, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Tue 16-Aug-05 15:28 by ssearch

Topology

L1 ------------------- L1L2 ---------------- L2

sending 31000 L1 routes to L1L2

overload bit is set in the L1L2 router in the case where L1 routes are leaked into L2 or L2 routes are leaked into L1 and this leaked routes require more than 256 LSP's.

So, I want to confirm if more than 256 LSP's is considered as the Router runs out of memory case and also can anyone tell me what will be the exact way to test the feature "Traditional use of overload bit".

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mellowd
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Re: ISIS Dynamic overload bit.

Mon Jul 02, 2012 1:22 am

The overload bit's function has changed. These days it's used for GR, NSR and things like waiting for BGP to converge before allowing transit through the local router.

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