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Hello protocol in rsvp-lsp-tunnel-09.txt

  • From: David Charlap <David.Charlap@marconi.com>
  • Date: Tue, 13 Nov 2001 12:29:25 -0500

Joe Dumont wrote:
> 
> I read draft-ietf-mpls-rsvp-lsp-tunnel-09.txt and was wondering how
> the Hello protocol would be implemented.  Specifically, if the ip
> address of the neighbor node(s) is (are) unknown, how do we get
> that address to establish the initial Hello "connectivity"?  Is
> this message issued on a well-known broadcast address?

Several possible ways.

1: For a a point-to-point link (like POS or ATM), then the neighbor
   address might be configured as a part of the link's configuration.

1a: Even for a broadcast interface (like Ethernet), you may have
    the ability to configure a set of neighbor addresses that you 
    expect to find attached to each interface.

2: It may be possible to get this information from routing protocols.

3: You can discover these addresses based on the addresses of incoming
   RSVP messages, like Path, Resv and Hello requests from your
   neighbor.

-- David