The MPLS WG Archive

["chetan kumar s" <chetan.kumar@wipro.com>]

On Mon, 23 Jul 2001, LDP Hello wrote:

Hi,
	The fact that need to considered here is that, two LSR can have
multiple LDP hello adjecencies for a label space, but only *one* TCP
session(for a label space). Thus in ur case the links L2 & L3 *will* be
unutilized..

Thanks
Chetan S

> 
> Hi ; My question is regarding the Transport address in the LDP hello
> ...
> 
> Is it reasonable for a router to add its ROUTER ID into the Transport
> TLV of hello... 
> consider 
>                        b1 > a1, b2 > a2, b3 > a3 
>        
>       _______                       ________
>      |LSR A  |a1 <---L1-------> b1 |LSR B   |
>      |ID:a1  |a2 <---L2-------> b2 |  ID:b1 |
>      |_______|a3 <---L3-------> b3 |________|
>  
>     
> Say LSR A always send ITS routerID (a1)  as the transport TLV in Hello
> instead of its Interface IP addresses... TCP session will be
> established properly on LINK L1 
> 
> Now trasport Address in Hellos on L2 & L3 is a1 and LSR B will try to
> establish TCP session with address a1 for interfaces b2 & b3 and that
> will be through link L1 again ...   LINKS L2 & L3 will never be
> utilized ... 
> 
> So my question is IS IT VALID/ACCEPTABLE to use ROUTER ID as the
> TRANSPORT ADDRESS INSTEAD of INterface address ...???
> 
> Thanks ... 
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