H3C Technologies H3C S6800 Series Switches - Manual (Page 40)

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Step Command Remarks
3. Specify an LDP peer and enter
LDP peer view. The device will
send unsolicited Targeted
Hellos to the peer and can
respond to Targeted Hellos sent
from the targeted peer.
targeted-peer peer-lsr-id
By default, the device does not
send Targeted Hellos to or
receive Targeted Hellos from
any peer.
4. Configure the Keepalive hold
time. mpls ldp timer keepalive-hold
timeout By default, the Keepalive hold
time is 45 seconds.
5. Configure the Keepalive
interval.
mpls ldp timer keepalive-interval
interval By default, the Keepalive interval
is 15 seconds.
6. Configure the LDP transport
address. mpls ldp transport-address
ip-address
By default, the LDP transport
address is the LSR ID of the local
device.
Configuring LDP backoff
If LDP session parameters (for example, the label advertisement mode) are incompatible, two LDP peers
cannot establish a session, and they will keep negotiating with each other.
The LDP backoff mechanism can mitigate this problem by using an initial delay timer and a maximum
delay timer. After LDP fails to establish a session with a peer LSR for the first time, LDP does not start an
attempt until the initial delay timer expires. If the session setup fails again, LDP waits for two times the
initial delay before the next attempt, and so forth until the maximum delay time is reached. After that, the
maximum delay time will always take effect.
To configure LDP backoff:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter LDP view or enter
LDP-VPN instance view.
• Enter LDP view:
mpls ldp
• Enter LDP-VPN instance view:
a. mpls ldp
b. vpn-instance
vpn-instance-name
N/A
3. Configure the initial delay
time and maximum delay
time.
backoff initial initial-time maximum
maximum-time
By default, the initial delay time is
15 seconds and the maximum
delay time is 120 seconds.
Configuring LDP MD5 authentication
To improve security for LDP sessions, you can configure MD5 authentication for the underlying TCP
connections to check the integrity of LDP messages.
For two LDP peers to establish an LDP session successfully, make sure the LDP MD5 authentication
configurations on the LDP peers are consistent.