[j-nsp] Hello packets sending on NBMA netwroks

[Chris Spears]

You need to statically configure your neighbors, per-link.

http://www.juniper.net/techpubs/software/junos/junos91/swconfig-routing/configuring-an-interface-on-a-nonbroadcast-multiaccess-network.html

RFC 2328
         9.5.1.  Sending Hello packets on NBMA networks

             Static configuration information may be necessary in order
             for the Hello Protocol to function on non-broadcast networks
             (see Sections C.5 and C.6).  On NBMA networks, every
             attached router which is eligible to become Designated
             Router becomes aware of all of its neighbors on the network
             (either through configuration or by some unspecified
             mechanism).  Each neighbor is labelled with the neighbor's
             Designated Router eligibility.


zhuifeng0426 wrote:
> Hi list:
> I have a question about Hello packet sending on NBMA networks:
> in page 79 of RFC 2328 it said:
> "If the router is eligible to become Designated Router, it
> must periodically send Hello Packets to all neighbors that
> are also eligible.  In addition, if the router is itself the
> Designated Router or Backup Designated Router, it must also
> send periodic Hello Packets to all other neighbors."
> and:
> "If the router is not eligible to become Designated Router, 
> it must periodically send Hello Packets to both the
> Designated Router and the Backup Designated Router (if they
> exist).  It must also send an Hello Packet in reply to an
> Hello Packet received from any eligible neighbor (other than
> the current Designated Router and Backup Designated Router).
> This is needed to establish an initial bidirectional
> relationship with any potential Designated Router."
> so, here is a question:
> since all eligible(other than DR and BDR) router won't send Hello packets to the router that is not eligible to become DR, how can these route reply the eligible(other than DR and BDR) router? 
> 
> 2009-06-19 
> 
> 
> 
> zhuifeng0426 
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> juniper-nsp mailing list juniper-nsp at puck.nether.net
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-- 

%%%%%%%%%%%%%%%%%%%%%%%%%%%
Chris Spears, OARnet
Senior Routing Engineer
phone: 614-292-9415
fax: 614-728-8110