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Mention that DN42_REGION should not be modified in transit

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James Lu 2021-12-19 18:20:51 -08:00
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howto/Bird-communities.md
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@ -78,8 +78,10 @@ According to [this mail](https://lists.nox.tf/pipermail/dn42/2015-December/00125
You need to add following lines to your config(s):
- `define DN42_REGION = $VALUE_FROM_ABOVE` to your node's config (where OWNAS and OWNIP are set)
- `if source = RTS_STATIC then bgp_community.add((64511, DN42_REGION));`
- `if source = RTS_STATIC then bgp_community.add((64511, DN42_REGION));`
just above `update_flags` in `dn42_export_filter` function
- Unlike the other community values, **the DN42_REGION community should only be set on routes originating from your network!** (This is what the `source = RTS_STATIC` check does).
- Otherwise, if you export routes across multiple regions within your network, you may be sending incorrect origin information to other peers.
## Example configurations