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Route Server BGP Community usage
This Euro-IX Large BGP Community standard list does not try to force IXPs to use all filters or options described below, that is entirely up to the IXPs themselves. However, we do ask that when an IXP does provide a service to its peers in the form of Large BGP Communities we would appreciate it if this list was respected as this will make it much easier for us, the IXP community, but also for our peers to understand what information is trying to be conveyed. When you do not see any community for what you need, then please use the reserved IXP free ranges for speedy deployment, but it would also be wise to start discussing your new community in the EURO-IX mailing list, or at the EURO-IX forums so that we can assign more permanent number for all to use.
Currently the community ranges are divided into 2 distinct ranges, namely 0-999 are for action communities, and 1000-1999 are meant for informational communities.
The first 32b part of the community should ALWAYS contain the Route Server's AS number.
For example ECIX's Route Servers would all use 9033:*:*
*:*:0 is seen as a wildcard unless stated otherwise.
For example, 9033:0:0 means do not send my route to any peer, while 9033:0:4200000000 only means do not send this prefix to AS 4200000000.
Range of communities to advertise to route server to take some kind of action with the announced prefixes to peers. (e.g. suppress prefixes to a particular peer in some way.)
| Range | Description | Notes |
|---|---|---|
| RS:0:PEERAS | Do not advertise to PEERAS | |
| RS:1:PEERAS | Advertise to PEERAS | Only useful in combination with RS:1:0 |
| RS:2:ms | Do not announce to peers higher than ms | ms = Latency of peer in ms |
| RS:3:ms | Do not announce to peers lower than ms |
| Range | Description | Notes |
|---|---|---|
| RS:101:PEERAS | Prepend to PEERAS once | |
| RS:102:PEERAS | Prepend to PEERAS twice | |
| RS:103:PEERAS | Prepend to PEERAS three times | |
| RS:111:ms | Prepend once to peers higher than ms | |
| RS:112:ms | Prepend twice to peers higher than ms | |
| RS:113:ms | Prepend three times to peers higher than ms | |
| RS:121:ms | Prepend once to peers lower than ms | |
| RS:122:ms | Prepend twice to peers lower than ms | |
| RS:123:ms | Prepend three times to peers lower than ms |
| Range | Description | Notes |
|---|---|---|
| RS:666:* | RESERVED RFC 7999 BLACKHOLE Community |
Free to use Action communities
Range of communities which can be set by the Route Server to give additional information to the advertised prefix (e.g. what the Route Server thinks the RPKI status is of this prefix is)
| Range | Description | Notes |
|---|---|---|
| RS:1000:1 | RPKI VALID | RS checked prefix RPKI and is VALID |
| RS:1000:2 | RPKI UNKNOWN | RS checked prefix and is UNKNOWN |
| RS:1000:3-* | RPKI INVALID BECAUSE OF $REASON | |
| RS:1001:1 | IRRDB VALID | Prefix exists in IRRDB |
| RS:1001:2 | IRRDB NOT CHECKED | Prefix was not checked in IRRDB |
| RS:1001:3 | MORE SPECIFIC THAN IRRDB | Prefix does not exist in IRRDB, but a less specific valid entry exists |
| RS:1001:4 | IRRDB Prefix not found in AS-SET or aut-num | Prefix was not found in the peer's as-set |
| RS:1001:5 | IRRDB INVALID ORIGIN AS | Origin AS not in peer AS-SET * |
| RS:1001:6 | IRRDB INVALID PREFIX FOR ORIGIN AS | Prefix not found in origin AS * |
| RS:1002:1-* | TRACER (RS #) | IXP assigned ID for route server instance |
| RS:1003:ms | measured RTT for advertising peer | IXP measured round trip time for peer in ms |
Prefixes which have these communities are not expected to be advertised to anyone by the route server, the route server has filtered them. It may still be useful to tag a route which is filtered so that you can see why a route was filtered. for example in BIRD you can still show the filtered routes with show route filtered all.
| Range | Description | Notes |
|---|---|---|
| RS:1101:1 | Prefix length too long | |
| RS:1101:2 | Prefix length too short | |
| RS:1101:3 | Bogon Prefix | |
| RS:1101:4 | Bogon AS | |
| RS:1101:5 | AS path too long | |
| RS:1101:6 | AS path too short | |
| RS:1101:7 | as-path.first != peeras | |
| RS:1101:8 | next hop IP != peer IP |
| Range | Description | Notes |
|---|---|---|
| RS:1102:1 | Advertising peer declines prefix | Advertising peer does not want you to receive prefix |
| RS:1102:2 | You declined prefix from advertising peer | You do not want to receive prefix from advertising peer |
| Range | Description | Notes |
|---|---|---|
| RS:1201: | ||
| RS:1202: | ||
| RS:1203:<REMOTE PEERING YES/NO> | 0 1 | |
| RS:1204: | UN M.49 Region code | Considered but use case limited? |
| Range | Description | Notes |
|---|---|---|
| RS:1301:1 | Prefix is Anycast |
| Range | Description | Notes |
|---|---|---|
| RS:1400:1 | Traffic mostly inbound | |
| RS:1400:2 | Traffic mostly outbound | |
| RS:1400:3 | Traffic balanced |
| Range | Description | Notes |
|---|---|---|
| RS:1500:* | 4B ASN, Flowspec, addpath, ... |
| Range | Description | Notes |
|---|---|---|
| RS:1600-1699 | Port speed |
Free to use informational communities