From: Ali Fahmi (afahmi@plasa.com)
Date: Tue Mar 04 2003 - 00:55:08 GMT-3
ISIS will decide L1 if the router get ISIS update from
same Area,
or decide L2 if get from another area,
if there is a redistribution, we should state whether
entry redistributed will be L1 or L2,
by default is L2,
Ali Fahmi
On Tue, 4 Mar 2003 10:30:54 +1000
Hunt Lee <huntl@webcentral.com.au> wrote:
>Hi Annu, Peter,
>
>I left all of my routers a L1/L2 (default)... so how does
>it decides whether
>it gets a L1 or L2 route?
>
>Thanks in advance,
>
>Best Regards,
>Hunt
>
>
>-----Original Message-----
>From: Annu Roopa [mailto:annu_roopa@yahoo.com]
>Sent: Tuesday, 4 March 2003 2:29 AM
>To: Hunt Lee; ccielab@groupstudy.com
>Subject: Re: ISIS L1/L2 mystery
>
>
>Hunt,
>How have ur routers been setup ? i mean L1/L2 or L1 etc ?
>As u have written
>a router within a area (if defined as L1 type under
>routers isis) will
>receive only L1 routes. A L1/L2 router will receive both
>L1/L2 routes and
>show it up in its IP table.
>In ur config the routers RTC and RTA should be L1/L2 type
>so that they
>exhange the L1/L2 routes between each other.Others would
>be L1 type in their
>respective areas and they would see only L1 routes and a
>default route to L2
>if i remember right.
>When redistributing the metric-type sets the type as L1
>or L2 (as u might
>know) and this setting will decide if the routes show up
>on ur L1 routers or
>not as L1/L2 would see it all.
>Let us know. Hope that helps.
>Annu
>
> Hunt Lee <ciscoforme3@yahoo.com.au> wrote:Hi guys,
>
>I did a lab scenario on ISIS. I got all the routes
>correctly on all of my
>routers.
>However, some of my routes have got different L1 / L2
>tags than as the model
>answer.
>
>How do we determine whether a particular ISIS route will
>be L1 or L2?
>
>- if the ISIS network is within the same ISIS area, then
>it is L1
>- if it is from a different ISIS area, it is L2
>
>So in the topology...
>
>RTC---RTD (top two is in ISIS Area 1)
>|
>RTA---RTB (bottom four is in ISIS Area 2)
>| \
>RTE RTF
>
>Or does it depends on ISIS Router types / redistribution
>commands...
>
>
>Any help / ideas would be greatly appreciated.
>
>Regards,
>Hunt
>
>
>
>
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