Parse RFC-standard, extended, and large BGP communities. Decode AS-action values and transit signaling flags.
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Router Policy Config Generator
Blackhole traffic to this destination
RFC 7999 / NTT Blackholing Support
Set LocalPref to 90 (Backup Peer)
Do not advertise to any peers outside region (North America)
Restricts route propagation to local region
Do not advertise to any peers outside region (Europe)
Do not advertise to any peers outside region (Asia-Pacific)
Customer route - Low Preference (70)
Customer route - Normal Low Preference (80)
Customer route - Backup Preference (90)
Discard traffic to this destination (Blackhole)
Blackhole traffic to target IP
Set LocalPref to 10 (Backup Peer)
Discard traffic (Blackhole) at Tata borders
Set LocalPref to 100 (Standard peer)
Set LocalPref to 120 (Customer route)
Prepend AS6453 1x to all peers
Prepend AS6453 2x to all peers
Discard traffic (Blackhole) at Arelion borders
Customer route (LocalPref 100)
Standard customer priority egress
Prepend AS1299 1x to all peers
Prepend AS1299 2x to all peers
Discard traffic (Blackhole) at GTT edge
Discard traffic (Blackhole) at Orange borders
Discard traffic (Blackhole) at Comcast borders
Set LocalPref to 90 (Backup route)
NO_EXPORT: Do not advertise outside AS/Confederation boundary
NO_ADVERTISE: Do not advertise to any BGP peer
Stops route propagation completely
NO_EXPORT_SUBCONFED: Do not advertise outside local confederation sub-AS
Restricts sub-confederation propagation
Tata Communications (America) Inc.
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Standard communities (RFC 1997) are 32-bit values split as a 16-bit ASN and a 16-bit value, which cannot fit 32-bit (4-byte) ASNs. Large BGP Communities (RFC 8092) are 96-bit values formatted as ASN:Action:Parameter, which easily accommodates 32-bit ASNs along with detailed policy options.
Remote Triggered Blackholing (RTBH) routes DDoS traffic destined to a victim host to a null/discard interface at the ISP boundary, discarding the malicious packets before they reach your link or exhaust transit bandwidth.
BGP routing daemons do not send communities by default. You must explicitly configure 'send-community' (Cisco) or set 'keep none' (Juniper) on the BGP neighbor session configuration.
Local Preference is a primary routing path selector evaluated first in the BGP route selection process. Higher values are preferred. Using community tags allows you to modify the upstream carrier's Local Preference for your announced subnets.