From: Craig King (cking007@xxxxxxxxxxx)
Date: Sat Jan 05 2002 - 10:34:11 GMT-3
In response to Q2 - since R12 has a connection to another L2 router, it will
automatically generate a default route (without the default info-originate
command) for it's Area 1 routers (R6). This is ISIS' normal behavior - it
wants to default everything into the L2 core.
>From: Annu <annu_roopa@yahoo.com>
>Reply-To: Annu <annu_roopa@yahoo.com>
>To: ccielab@groupstudy.com
>Subject: Simple IS-IS Doubts
>Date: Fri, 4 Jan 2002 20:47:16 -0800 (PST)
>
>Gurus,
>
>While we are discussing so much of IS-IS,I have some
>doubts. My scenario is as follows. Very close to
>Doyles case on Page 652 except with different IP
>addresses.Ver 12 on routers.
>
> R6 (L1)
> |
> (L1/2)R11 R12 (L1/2)
> | ethernet |
> |--------------------|
> |
> L2 router
>
>Q1. When I see neighbors on R11 and R12 and R6 they
>show me as below.I have known IS type L1/L2 or both.
>What is this type "IS" which I see below.What is wrong
>or what am I missing ?
>
>R11/R12 are L1/L2. R6 has been configured as L1
>explicitly.
>
>r6#show clns is-neighbors
>System Id Interface State Type Priority Circuit Id
>Format
>r12 Se0 Up IS 0 00 Phase V
>
>r12#show clns is-neighbors
>
>System Id Interface State Type Priority
>Circuit Id Format
>r6 Se0 Up IS 0 00
> Phase V
>r11 Et0 Up L1L2 64/64
>r12.01 Phase V
>
>
>r11#show clns is-neighbors
>System Id Interface State Type Priority
>Circuit Id Format
>r12 Et0 Up L1L2 64/64 r12.01 Phase v
>
>
>Q2. R6 automatically sees R12 as default gateway even
>though no "default info orgin" has been configured
>On R12. Is this expected and ok ? I have some L2
>routers connected to R12/R11 on Ethernet which has
>been avoided for simplicity.
>
>Q3.Most of the examples show area addres in IS-IS as
>49.0001 or 47.0001 .What if this is 01 or 02 etc.Bcoz
>i see that area addres is 1 byte in the normal
>address.Which format are the books using ?
>
>
>
>=====
>Thanks in advance for ur time and replies.
>Annu.
>
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