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Bird-communities: copyedit

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James Lu 2022-08-09 11:29:19 -07:00
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howto/Bird-communities.md
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@ -42,7 +42,7 @@ Propagation:
```
For example, if your peer is 12ms away and the link speed between you is 250Mbit/s and you are peering using OpenVPN P2P, then the community string would be (3, 24, 33).
Two utilites which measure round trip time and calculate community values automatically are provided, written in [ruby](https://github.com/Mic92/bird-dn42/blob/master/bgp-community.rb) and [C](https://github.com/nixnodes/bird/blob/master/misc/dn42-comgen.c).
Two utilities which measure round trip time and calculate community values automatically are provided, written in [ruby](https://github.com/Mic92/bird-dn42/blob/master/bgp-community.rb) and [C](https://github.com/nixnodes/bird/blob/master/misc/dn42-comgen.c).
```
$ ruby bgp-community.rb --help
@ -62,8 +62,9 @@ $ ruby bgp-community.rb -6 dn42-2.higgsboson.tk 1000 pfs
There are two type of route origin: `region` and `country`
#### Region
The range `41~70` are assgined to the region property.
According to [this mail](https://lists.nox.tf/pipermail/dn42/2015-December/001259.html) these are the communities for route origin(region):
The range `41-70` is assigned to the region property.
The communities for route origin region were first defined in [December 2015](https://lists.nox.tf/pipermail/dn42/2015-December/001259.html) and further extended in [May 2022](https://groups.io/g/dn42/topic/91226190):
```
(64511, 41) :: Europe
(64511, 42) :: North America-E
@ -85,8 +86,8 @@ According to [this mail](https://lists.nox.tf/pipermail/dn42/2015-December/00125
```
#### Country
The range `1000~1999` are assigned to the country property, we uses the country code from [ISO-3166-1 Numeric](https://github.com/lukes/ISO-3166-Countries-with-Regional-Codes/blob/master/all/all.csv)
The `1000 + country code` are the communities for route origin(country).
The range `1000-1999` is assigned to the country property. Here we use [ISO-3166-1 numeric](https://github.com/lukes/ISO-3166-Countries-with-Regional-Codes/blob/master/all/all.csv) country codes, adding `1000` to each value to get the country origin community:
```
(64511, 1124) :: Canada
(64511, 1156) :: China
@ -114,7 +115,7 @@ just above `update_flags` in `dn42_export_filter` function
- Otherwise, if you export routes across multiple regions within your network, you may be sending incorrect origin information to other peers.
## Example configurations
## Example configurations
```
# /etc/bird/peers4/tombii.conf
protocol bgp tombii from dnpeers {
@ -203,7 +204,7 @@ include "bird/local4.conf";
#################
include "/etc/bird/filter4.conf";
include "/etc/bird/community_filters.conf";
include "/etc/bird/community_filters.conf";
```