BGP - Implement, optimize and troubleshoot routing policies - Communities, extended communities

4 important questions on BGP - Implement, optimize and troubleshoot routing policies - Communities, extended communities

How much bits are standard communities?

32 bits

How much bits are extended communities and what are the different field?

64 bits

I bit IANA registered
T bit Transitive
6 bits Type (high)) FORMAT
8 bits  Type (low) Used for MPLS/Route-targets
6 byte Community

What are the allowed values for extended communities?

1-65534:0-65535
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What are the different bgp extended community High-Formats?

Global: Local

0x00= 2-byte ASN: 4-byte Assigned Number
0x01= 4-byte IPv4 Marker: 2-byte Assigned Number
0x02= 4-byte ASN:2-byte Assigned Number
0x03= Opaque Community

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