net id for level-2

Unanswered Question
Nov 24th, 2008
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Hi,


below is my isis config


R1

interface fe 0/0

ip address 192.168.2.2 255.255.255.0

ip router isis

isis circuit-type level-2-only


interface s 0/0

ip address 172.16.1.1 255.255.255.252

ip router isis

isis circuit-type level-1


router isis

net 49.0001.1111.1111.1111.00



what is the area id of level-1 and level-2 by default?


how do I config the net (49.0002.2222.2222.222.00) to level-2


rdgs


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royalblues Mon, 11/24/2008 - 01:19
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ISIS behaves a bit differently than OSPF in terms of areas..


In ISIS the entire router is in a particular area whereas in OSPF an interface belongs to a particular area .


So in the above case the area ID would be 49.0001 for both level1 and level 2


Narayan

anitachoi3 Mon, 11/24/2008 - 03:36
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Hi,


Base on the ccnp BSCI book, L2 and L1 should not be in the same area, should be it?


if so, how to assign different net id to "single route"? one is for L1, other is for L2.


rdgs


royalblues Mon, 11/24/2008 - 03:49
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you cannot


The L2 routers in ISIS route between areas.


All areas will have a L1/L2 router that can connect to the L2 router for routing away from that area.


You can define the circuit type to be L2 only on the interface connecting to a L2 router so that it does not send any L1 hellos


Narayan

anitachoi3 Mon, 11/24/2008 - 05:07
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Hi,


Base on my config, it is not the correct setting, is it?


for the normal setting of single router must be "L1" or "L1 and L1/L2" or "L1/L2 and L2".


Is it the correct concept?


rdgs



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