The MPLS-OPS Archive

[Puddinhead Wilson <puddinghead_wilson007@yahoo.co.uk>]

It makes sense to do 2 in the scenario if there is no
constraint associated with the LSP.

For that matter when even do an "igp shortcut" when
there is no constraint to be associated with it.

Simply send it out in MPBGP

only corner case could be if the tunnel was IPSEC.

:)



 --- "M. ELK" <elkou141061@hotmail.com> wrote: > Hi
> 
> Despite it was explained to me previously still
> facing some difficulty.
> Consider the following :
> 
> 
> R1-a-----R2-----R3-----R4
> 
> P1 prefix associated with R1 ,P2 with R2 ...etc .
> 
> All link with 10 as cost . "a" is the interface of
> R1
> 
> currently at R1 :
> 
> Prefix      Cost    Via
> P2           10       a
> P3           20       a
> p4           30       a
> 
> Set T1 from R1 to R4 with absolute metric 1 :
> 
> Case 1 :
> 
> Prefix         Cost         Via
> P2              10          a
> P3              20          a
> p4              1           T1
> 
> Case 2 :
> 
> Prefix      Cost    Via
> P2           10       a
> P3           11      T1
> p4           1        T1
> 
> Is it case 1 or case 2 (mainly for P3) ??
> My guess it will be case 1 to follow
> draft-ietf-rtgwg-igp-shortcut-00.txt, 
> but what are the reason
> to prefer this approach , is it to avoid any
> possible loop ??? If yes : 
> could U pls provide an
> example of topology where loop could exist .
> 
> .
> 
> Now :
> Config T2 from R4 to R1 with absolute metric 1 .
> R1 and R4 are config to advertise T1,T2  as link in
> the IGP .
> 
> at R1 :  could we expect that it is now case 2 ??? .
> 
> 
> Brgds
> 
>
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