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https://issues.apache.org/jira/browse/DISPATCH-873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247619#comment-16247619
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ASF subversion and git services commented on DISPATCH-873:
----------------------------------------------------------
Commit 6ccbebb23635a6a61e56d5c2698aec2b39ab3055 in qpid-dispatch's branch
refs/heads/1.0.x from [[email protected]]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-dispatch.git;h=6ccbebb ]
DISPATCH-873 - Remove next-hop when new route to a node is via a neighbor link.
Hat tip to Mick Goulish for identifying the root cause of this bug.
> new routes calculated wrongly after connector deletion
> ------------------------------------------------------
>
> Key: DISPATCH-873
> URL: https://issues.apache.org/jira/browse/DISPATCH-873
> Project: Qpid Dispatch
> Issue Type: Bug
> Components: Routing Engine
> Affects Versions: 1.0.0
> Reporter: michael goulish
> Assignee: Ted Ross
> Priority: Blocker
> Fix For: 1.0.0
>
>
> I have a 3-mesh network with nodes A, B, C.
> B-->A cost is 10
> C-->A cost is 10
> B-->C cost is 100.
> Initial route from B to C is calculated correctly as B,A,C : cost == 20.
> But after I used qdmanage to delete the connector from B to A, I get no
> further messages delivered from B to C.
> Using qdstat to look at routing table, it looks wrong:
> Both B and C think they can only get to each other by going through A. But
> there is now no route that way, because B-->A has been deleted. They should
> be using the direct connection B-->C. Yet they both calculate the cost
> correctly as 100.
> ===========================================================
> A
> ===========================================================
> Routers in the Network
> router-id next-hop link ver cost neighbors valid-origins
> A (self) - 1 ['C'] []
> B C - 1 110 ['A', 'C'] []
> C - 1 1 10 ['A', 'B'] ['B']
> ===========================================================
> B
> ===========================================================
> Routers in the Network
> router-id next-hop link ver cost neighbors valid-origins
> B (self) - 1 ['C'] []
> C A - 1 100 [] []
> ===========================================================
> C
> ===========================================================
> Routers in the Network
> router-id next-hop link ver cost neighbors valid-origins
> A - 0 1 10 ['C'] []
> B A - 1 100 ['A', 'C'] ['A']
> C (self) - 1 ['A', 'B'] []
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