The MPLS WG Archive

[Eric Gray <eric.gray@sandburst.com>]

Katta,

    I am certain that - when a new size for AS numbers is defined - then
a number of protocols will need to be looked at to see if there is a need to
extend them to support this new size.  As it is, most newer protocols are
defined in such a way that it is not too hard to extned them for just such
an occasion.  CR-LDP and RSVP-TE are both extensible in this way.

    Hence, no particular change is immediately required for either of these
MPLS explicit route signaling protocols.

--
Eric Gray

You wrote:

> Hi,
> In CR-LDP draft, it is assumed that Autonomous System (AS) number length as
> 2 bytes. (Section: 4.7.3)
>
> But work is underway in IETF, for supporting 4 octet AS number.
> There is a draft in progress by IDR work group which is talking about
> extending BGP to support 4 octet AS number.
>
> I am not sure whether the 4 octet AS number support is a BGP required
> feature or it is a general requirement for Internet.
>
> If 4 octet AS number support is necessary , it is better to encode AS number
> as TLV or AS number field can be declared as variable length filed which can
> be extracted using length filed of ER-HOP TLV.
>
> Regards,
> Katta