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-rw-r--r--doc/bird.sgml24
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