From: Scott Morris (swm@emanon.com)
Date: Sun Apr 11 2004 - 10:24:25 GMT-3
It's a slightly backwards way of thinking about things...
In OSPF for example, you have explicitly defined timers. In that you know
you send hellos every 10 seconds on some interfaces, and the dead timer is
40 seconds. Two easily recognizable numbers. The dead timer is 4 times the
hello timer. If you change the hello timer, it will change the dead timer as
well, although you can still change the dead timer independently.
In ISIS, we have the same thing, it's just a different reference point. The
hello multiplier will give us the same number in ospf, just different way of
thinking. It references how many subsequent hellos can be missed before the
peer is dead. In the example of ospf above, that number would be 4 by
default.
The default value is 3 times whatever the hello timer happens to be. So if
you're asked in a scenario to change things, with ISIS, you need to know one
before the other.
Check out
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuratio
n_guide_chapter09186a00800c5bc1.html#1001111
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIS, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ahmed Mustafa
Sent: Sunday, April 11, 2004 3:46 AM
To: ccielab@groupstudy.com
Subject: ISIS Hello Timers
Can someone explain the ISIS hello timer and dead timer before the route
gets removed from the routing table.
I read the Cisco documentation, and learned about ISIS hello, and ISIS hello
Multiplier, but it was not articulate enough.
For example, if I want route to declare neighbor is down in 5 seconds then
what hello parameter will I have to change.
Hello-Interval = I think default is 10 seconds.
Hello Multiplier --- Is is same as dead or holddown timer.
I don't even any see comands in IOS to see those parameters.
Regards,
Ahmed
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