HP FlexFabric 12500 Command Reference Manual page 56

Predefined user roles
network-admin
mdc-admin
Parameters
hello-hold timeout: Specifies the Hello hold time in the range of 1 to 65535 seconds. LDP keeps the hello
adjacency during the Hello hold time. The negotiated Hello hold time takes the smaller value of the local
Hello hold time and the peer Hello hold time. If LDP receives no Hello message from the peer before the
Hello hold timer expires, LDP deletes the Hello adjacency with the peer. If you set the Hello hold time to
65535, LDP permanently keeps the Hello adjacency.
hello-interval interval: Specifies the Hello interval in the range of 1 to 65535 seconds. LDP sends Hello
messages at this interval.
keepalive-hold timeout: Specifies the Keepalive hold time in the range of 15 to 65535 seconds. LDP
keeps the LDP session with the peer during the Keepalive hold time. The negotiated Keepalive hold time
takes the smaller value of the local Keepalive hold time and the peer Keepalive hold time. If LDP receives
no LDP message from the peer before the Keepalive hold timer expires, LDP deletes the LDP session with
the peer.
keepalive-interval interval: Specifies the Keepalive interval in the range of 1 to 65535 seconds. LDP
sends Keepalive messages to the peer at this interval.
Usage guidelines
In interface view, this command sets a Link Hello hold time and a Link Hello interval.
In LDP peer view, this command sets a Targeted Hello hold time and a Targeted Hello interval.
If the Hello hold time and the Keepalive hold time values are too large, LDP cannot quickly detect link
failures. If the values are too small, LDP might mistakenly consider a normal link failed. HP recommends
that you use the default values.
If two LSRs have multiple LDP links in between, make sure that those links have the same Keepalive hold
time.
During LDP session negotiation, an LSR compares the local Hello hold time with the Hello hold time of the
peer LSR, and uses the smaller one as the negotiated Hello hold time. If the negotiated Hello hold time
is larger than three times the local Hello interval, the LSR sends Hello messages at the local Hello interval.
Otherwise, the LSR sends Hello messages at an interval 1/3 of the negotiated Hello hold time.
During LDP session negotiation, an LSR compares the local Keepalive hold time with the Keepalive hold
time of the peer LSR, and uses the smaller one as the negotiated Keepalive hold time. If the negotiated
Keepalive hold time is larger than three times the local Keepalive interval, the LSR sends Keepalive
messages at the local Keepalive interval. Otherwise, the LSR sends Keepalive messages at an interval
1/3 of the negotiated Keepalive hold time.
Examples
# Set the Targeted Hello hold time to 1000 seconds, Targeted Hello interval to 50 seconds, Keepalive
hold time to 1000 seconds, and Keepalive interval to 50 seconds for peer 3.3.3.3.
<Sysname> System-view
[Sysname] mpls ldp
[Sysname-ldp] targeted-peer 3.3.3.3
[Sysname-ldp-peer-3.3.3.3] mpls ldp timer hello-hold 1000
[Sysname-ldp-peer-3.3.3.3] mpls ldp timer hello-interval 50
[Sysname-ldp-peer-3.3.3.3] mpls ldp timer keepalive-hold 1000
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