From: Peter van Oene (pvo@usermail.com)
Date: Tue Mar 04 2003 - 14:17:36 GMT-3
At 10:55 AM 3/4/2003 +0700, Ali Fahmi wrote:
>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,
ISIS routes received in L1 LSPs are L1, and those received in L2 LSPs are
L2. If you get both, you prefer intra vs inter, and hence post the L1 version.
>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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