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| author | Ondrej Zajicek <santiago@crfreenet.org> | 2009-03-13 12:49:44 +0100 |
|---|---|---|
| committer | Ondrej Zajicek <santiago@crfreenet.org> | 2009-03-13 12:49:44 +0100 |
| commit | e8ba557c7f66aaf02dd24f554fba8b3607c2b3d5 (patch) | |
| tree | 64f1e9d86256b1603e8713b973cf8e666aaf2f80 /doc | |
| parent | e3299ab14877de6ce688050e550c44cd4e85b212 (diff) | |
| download | bird-e8ba557c7f66aaf02dd24f554fba8b3607c2b3d5.tar bird-e8ba557c7f66aaf02dd24f554fba8b3607c2b3d5.zip | |
Update capability handshake options
Add 'capabilities' option, change default behavior to advertise ipv4,
add some checks and ignore incoming capabilities when capabilities
are disabled.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/bird.sgml | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml index 5095b78..ee4697e 100644 --- a/doc/bird.sgml +++ b/doc/bird.sgml @@ -669,6 +669,8 @@ MD5 password authentication (RFC 2385<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc2385.txt">), route reflectors (RFC 4456<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc4456.txt">), +multiprotocol extensions +(RFC 4760<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc4760.txt">), and 4B AS numbers (RFC 4893<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc4893.txt">). @@ -762,15 +764,19 @@ for each neighbor using the following configuration parameters: Even when disabled (off), BIRD behaves internally as AS4-aware BGP router. Default: on. - <tag>advertise ipv4</tag> Advertise IPv4 multiprotocol capability. - This is not correct behavior but it is required by some BGP - implementations (Cisco and Quagga). Without this option, - the session establishment with these implementations takes - more time, session is degraded (no optional capabilities) - and the problem is logged. When the option is used, there might - be compatibility issues with other BGP implementations. - This option is relevant to IPv4 mode only. - Default: disabled. + <tag>capabilities <m/switch/</tag> Use capability advertisement + to advertise optional capabilities. This is standard behavior + for newer BGP implementations, but there might be some older + BGP implementations that reject such connection attempts. + When disabled (off), features that request it (4B AS support) + are also disabled. Default: on, with automatic fallback to + off when received capability-related error. + + <tag>advertise ipv4 <m/switch/</tag> Advertise IPv4 multiprotocol capability. + This is not a correct behavior according to the strict interpretation + of RFC 4760, but it is widespread and required by some BGP + implementations (Cisco and Quagga). This option is relevant + to IPv4 mode with enabled capability advertisement only. Default: on. <tag>disable after error <m/switch/</tag> When an error is encountered (either locally or by the other side), disable the instance automatically |