From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Tue Jun 29 2004 - 16:41:57 GMT-3
Diptish,
With IS-IS the hello timers do not need to match like they do
with OSPF. Each IS-IS hello carries its "holding timer". This timer is
used to determine when to declare that particular neighbor dead.
Example: When a hello is received by a router, the router will
first look to see if it already has an adjacency formed with the source
of the hello. If it does, the router will reset the holdtime to the
value of the "hold timers" field in the hello itself.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
diptish doshi
Sent: Tuesday, June 29, 2004 12:19 PM
To: ccielab@groupstudy.com
Subject: ISIS hello timers
hi all ,
Below is a sample config of interfaces connected
through frame relay ...The router is running ISIS
routing protocol( both router are l1-l2 router ) ...
note the hello interval ... after giving such
drastically different hello interval i was expecting
the adjacency to go down , route to get vanished .but
to my surprise nothing happen adjacency was up and
fine and nor did any route vanished and all the
network was pingable ... am i really missing something
big ???
( Also i tried the same thing on ethernet lan ... and
observed the same thing ... )
interface Serial0.1 point-to-point
ip address 172.16.1.1 255.255.255.252
ip router isis
frame-relay interface-dlci 205
isis hello-interval 5
interface Serial0.1 point-to-point
ip address 172.16.1.2 255.255.255.252
ip router isis
frame-relay interface-dlci 502
isis hello-interval 100
Regards ,
diptish
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This archive was generated by hypermail 2.1.4 : Sat Jul 03 2004 - 19:40:52 GMT-3