Chuck Rolke created DISPATCH-1183:
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Summary: Link state cost propagation takes a long time
Key: DISPATCH-1183
URL: https://issues.apache.org/jira/browse/DISPATCH-1183
Project: Qpid Dispatch
Issue Type: Improvement
Components: Routing Engine
Affects Versions: 1.4.1
Environment: Fedora 27; current master build.
Configurations generated by the gen_configs.py attachment.
Reporter: Chuck Rolke
Attachments: az-kill-restart.html, gen_configs.py
A router network of 26 routers in a single ring is started on a single system.
The logs are analyzed to find all the ROUTER_LS costs log lines and presented
in the az-kill-restart.html attachment. On that web page select 'Router link
state' in the table of contents to see the link state table.
In the link state table there is a column for each router. Then the ROUTER_LS
cost lines are shown in rows as follows
* When a router starts it displays a green mark in it's own column and orange
marks in all other columns to indicate that all other routers are unreachable.
* When a router declares a cost result the costs to known routers are shown in
their respective columns. Routers for which no costs were declared are shown
with orange marks indicating that they are unreachable.
* The generation code analyzes the complete link state costs across all
routers after each row is shown. When a consistent set of costs is published
for all routers then a green row indicating 'stable' is shown.
||Time||Event||
|14:10:58|Boot network|
|14:11:00|Cost propagation begins|
|14:11:37|Costs stabilize|
|14:12:00|Router D process stopped|
|14:12:41|Costs stabilize without D|
|14:14:30|Router D restarted|
|14:14:50|Costs stabilize|
There's no bug here as the costs stabilize directly. It is an observation that
the network reachability and cost state takes 'a long time' to settle. Can this
run faster?
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