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From: Alex Zinin (azininNEXSI.COM)
Date: Tue Jul 24 2001 - 00:13:42 CDT
If a router has no adjacency on a broadcast/NBMA
interface, it includes a type-2 link into its router-LSA
to announce the associated subnet.
-- Alex Zinin
Monday, July 23, 2001, 8:28:05 PM, shen jing wrote:
> Thank you very much.
> But, what do you means "Routing to the destinations on the segment > itself will proceed as usual"? > If the network does not appear in LSAs of router attached to it, I think > the network graph in router > will not include such a network. Will each router attached to the > network add a direct connectionn > item for each port's subnet ? how will other routers , which is not > directly connected to it > , know the existence of the network ? I think even those routers who is > directly connected to > such a network can forward packet to those host on the subnet, other > router will not be able to do > the same.
> Would you please give more hints on this question?
> Jing Shen
>> Jing, >> >> First off, note that normally, there will be at >> list the DR on the segment and the situations where >> a segment does not have any DR is either a configuration >> mistake (all routers have priority 0) or transient (the DR/BDR >> has not accepted its responsibilities yet). >> >> Nevertheless, if there's no DR/BDR on a segment, no adjacencies >> will be established btw the router attached to it, the network >> will not be announced in the routers' LSAs, and, as a consequence, >> it will not be used as a transit element by the routers. Routing >> to the destinations on the segment itself will proceed as usual, >> however. >> >> -