diff options
Diffstat (limited to 'doc/bird.sgml')
| -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 5095b780..ee4697ec 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 |