[j-nsp] LDP basic discovery packets

[Josef Buchsteiner]

Daniel,

   RFC3096 does state

   [1.2. LDP Message Exchange]

   "this is transmitted as a UDP packet to the LDP port at the `all routers on
   this subnet' group multicast address."


   If I would be a router and get such PDU's on interfaces configured
   with subnet A which do not belong to the same subnet A I would trash
   them ;-)


   Josef

Saturday, April 17, 2004, 7:34:36 PM, you wrote:

DR> Hi,

DR> JunOS is sourcing LDP basic discovery PDUs from the egress interface
DR> IP as source. Can this be changed to use the router-id?

DR> This would help filtering extremely. Currently, short of listing every
DR> remote backbone interface IP as valid LDP discovery source (with
DR> 224.0.0.2 as destination IP), one can just allow unconditionally LDP
DR> packets to 224.0.0.2 to allow LDP basic discovery to work.

DR> Extended discovery (unicast) PDUs are already sent with the loopback IP
DR> as source (at least if default-address-selection is enabled).


DR> Best regards,
DR> Daniel
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