The MPLS WG Archive

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

On Wed, 23 Oct 2002, Vijayanand C - CTD, Chennai. wrote:

> When using FA-LSPs for tunneling/label stacking how will the signalling for
> the bottom label be done. WIll the path message be sent through the FA-LSP
> itself or through the normal interfaces to the tunnel egress

Hi Vijay
	One has two options to do this (similar to what U have said). One
can send this over normal interface, and in case of control and data plane
separation, set NHOP to the control plane address. And make sure that U do
not set the "IP Router Alert" option. Thus U can stop PSB creation at
intermediate routers. Alternative option would be to tunnel to the FA LSP
tail-end, in this case no one stops from using FA LSP itself. How to
account for path message refreshes is, by making sure that some bandwidth
is set aside for control plane data traffic.

Thanks
Chetan S

>
>  In the former case how will the bandwidth for signalling refreshes be
> accounted for in the FA-LSPs bandwidth ?In the latter case how can it be
> ensured that the path message does not create path state in the intermediate
> nodes.
>
> Thanks in advance.
> Vijay
>

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