rfc9747v2.txt   rfc9747.txt 
skipping to change at line 252 skipping to change at line 252
by default on hosts. The method for provisioning device B to loop by default on hosts. The method for provisioning device B to loop
back Unaffiliated BFD Echo packets is outside the scope of this back Unaffiliated BFD Echo packets is outside the scope of this
document. document.
Similar to what's specified in [RFC5880], the Unaffiliated BFD Echo Similar to what's specified in [RFC5880], the Unaffiliated BFD Echo
session begins with the periodic, slow transmission of Unaffiliated session begins with the periodic, slow transmission of Unaffiliated
BFD Echo packets. The slow transmission rate should be no greater BFD Echo packets. The slow transmission rate should be no greater
than one packet per second, until the session on device A is Up. than one packet per second, until the session on device A is Up.
After the session is Up, the provisioned transmission interval is After the session is Up, the provisioned transmission interval is
used. When the Unaffiliated BFD Echo session on device A goes Down, used. When the Unaffiliated BFD Echo session on device A goes Down,
the slow transmission rate is resumed. The "Detect Mult" defined in the slow transmission rate is resumed. The "Detect Mult" field
[RFC5880] MUST be set to a value provisioned on device A. When the defined in [RFC5880] MUST be set to a value provisioned on device A.
bfd.SessionState is Up and a "Detect Mult" number of Unaffiliated BFD When the bfd.SessionState is Up and a "Detect Mult" number of
Echo packets have not arrived at device A as they should, the device Unaffiliated BFD Echo packets have not arrived at device A as they
A "MUST set bfd.SessionState to Down and bfd.LocalDiag to 2 (Echo should, the device A "MUST set bfd.SessionState to Down and
Function Failed)", as specified in Section 6.8.5 of [RFC5880]. bfd.LocalDiag to 2 (Echo Function Failed)", as specified in
Section 6.8.5 of [RFC5880].
In summary, the Unaffiliated BFD Echo packet reuses the format of the In summary, the Unaffiliated BFD Echo packet reuses the format of the
BFD Control packet defined in [RFC5880], and the fields within the BFD Control packet defined in [RFC5880], and the fields within the
Unaffiliated BFD Echo packet are populated as follows: Unaffiliated BFD Echo packet are populated as follows:
* My Discriminator: MUST be set to the provisioned local * My Discriminator: MUST be set to the provisioned local
discriminator. discriminator.
* Your Discriminator: MUST initially be set to 0, and then MUST be * Your Discriminator: MUST initially be set to 0, and then MUST be
set to the value of "My Discriminator" looped back from the remote set to the value of "My Discriminator" looped back from the remote
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