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add ghost route protection
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Simon Marsh 2020-09-13 00:15:31 +01:00
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21
pages/01.home/bgp-communities/default.md
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@ -52,3 +52,24 @@ burble.dn42 implements [large BGP communities](http://largebgpcommunities.net/),
| ( 4242422601 : 140 : _DN42 region_ )   | Route learned in this DN42 region |
 
### Ghost Route Protection
In a large network like burble.dn42 it can take some time for route updates
to be distributed and for the network to settle following changes. This can
be particularly noticeable when routes are deleted as it can create a
cascade of ghost updates, each with an increasing internal path length as
the route removal spreads across the network.
To protect against ghost routes, a community is used to track how many internal
hops a route has. In a fully meshed network like burble.dn42, a genuine route should
never have more than two internal hops, so an export filter is used to prevent
distribution of longer paths.
|Community  |Description|
|:---|:---|
| ( 4242422601 : 100 : 1 )   | Added on first internal re-distribution |
| ( 4242422601 : 100 : 2 )   | Added on second re-distribution and prevents further re-distribution within burble.dn42 |
 
The ( 4242422601 : 100 : x ) communities are not exported to peers.

3
pages/01.home/maintenance-log/default.md
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@ -15,6 +15,9 @@ A log of changes to the burble.dn42 network.
uk-lon1 has been upgraded. If you are peered on this node, please update
your IP address accordingly.
burble.dn42 now includes some limited protection against ghost route updates.
See the [communities](/home/bgp-communities) page for more details.
#### 9th September 2020
uk-lon1 will be upgraded this weekend (12/13th