Re: type-5 las extarnal-tag field

tajay <tajay@NETD.COM> Fri, 15 July 2005 05:32 UTC

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Date: Fri, 15 Jul 2005 10:59:13 +0530
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From: tajay <tajay@NETD.COM>
Subject: Re: type-5 las extarnal-tag field
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hi pareash,
thanks for explaination, i have some  doubts,
Paresh Khatri wrote:

>HI Ajay,
>
>The external route tag is not used by OSPF itself.  It is transparently conveyed with type-5/type-7 LSAs so that applications can make any desired use of it.  One particular application is when you are doing two-way redistribution at multiple points.  In such a case, you could associate a certain tag when redistributing routes into OSPF.  That way, when you are redistributing *from* OSPF into another protocol at some other redistribution point, you can dis-regard the routes that have that tag associated with it.
>
Do you mean controlling redistribution based on tag field..???

I am just giving one example...


R1------------------------R2---------------------------R3--------------------------R4

R1 and R2 runs RIP.  
R2 and R3 runs OSPF.
R3 and R4 runs BGP.


Now suppose at R2  I am redistributing routes into ospf domain  with tag 
field   100 .
Also suppose  there are some static routes at R2 which i am 
redistributing into OSPF domain with tag 200.

Now my question is how R3 can use these tag field while redistributing 
into BGP domain. In normal impementation do we have that type of 
configuration command which allows filtering based on tag fields.

thanks
ajay
 


>
>HTH,
>Paresh.
>
>
>
>-----Original Message-----
>From: Mailing List [mailto:OSPF@PEACH.EASE.LSOFT.COM]On Behalf Of tajay
>Sent: Thursday, 14 July 2005 12:07 AM
>To: OSPF@PEACH.EASE.LSOFT.COM
>Subject: type-5 las extarnal-tag field
>
>
>hi guys,
>I am not clear about extarnal-route-tag field in the type-5 lsa.  Can 
>anyone  just give me some information about that. Also what should be 
>the default value of the tag field? where it is useful ..? 
>
>thanks
>ajay
>
>
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Re: type-5 las extarnal-tag field Paresh Khatri
Re: type-5 las extarnal-tag field Dave Katz
Re: type-5 las extarnal-tag field Vishwas Manral
Re: type-5 las extarnal-tag field tajay
Re: type-5 las extarnal-tag field Paresh Khatri