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authorPeter Szilagyi <peszilagyi@gmail.com>2011-10-01 17:22:51 +0400
committerDenis Ovsienko <infrastation@yandex.ru>2012-02-14 03:06:17 +0400
commitd034aa027ef44d0a74805c27ad2a4d8ea20395d1 (patch)
treebf464ce298c822f207f14423a9a1dc847d960cc0 /ospfd/.gitignore
parent907fd95e502e10334e5390c73cc57588b88b8171 (diff)
isisd: fix wrong next-hops from SPF
The forwarding table was filled with wrong next-hops, and which is even worse, it was done in a totally non-deterministic way. The next-hop set for an IP prefix by isisd was the neighbor IS from which the flooded LSP about the IP prefix was arrived. So, if an IS received all the LSPs through its, say, eth0 interface, all entries in the forwarding table contained the next IS reachable via eth0 as the next-hop. The solution is to propagate the correct next-hop further from node to node as the SPF algorithm traverses the graph and selects the next node to be added to the set of already covered nodes. Also, the construction of the tentative node list (the nodes where the shortest path is not known yet) was buggy: if a node was already a member of this list with a certain path cost, and an alternative path was found to it with a lower cost while processing a pseudo-node LSP, it was not added to the list. This way, the path selected by isisd for a certain prefix was the first one it encountered during the LSDB processing. Signed-off-by: Fritz Reichmann <fritz@reichmann.nl>
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