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doc: add BFD minimum TTL documentation

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Let the user know what the new command does.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>
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Rafael Zalamena 2020-08-11 14:59:09 -03:00
parent 262e1d2528
commit 158a95c507
1 changed files with 13 additions and 0 deletions
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doc/user/bfd.rst
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@ -184,6 +184,19 @@ BFD peers and profiles share the same BFD session configuration commands.
The default is active-mode (or ``no passive-mode``). The default is active-mode (or ``no passive-mode``).
.. index:: [no] minimum-ttl (1-254)
.. clicmd:: [no] minimum-ttl (1-254)
For multi hop sessions only: configure the minimum expected TTL for
an incoming BFD control packet.
This feature serves the purpose of thightening the packet validation
requirements to avoid receiving BFD control packets from other
sessions.
The default value is 254 (which means we only expect one hop between
this system and the peer).
BFD Peer Specific Commands BFD Peer Specific Commands
-------------------------- --------------------------