Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 370)

346 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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Setting the LDP Hello Interval and Hold Timeout values
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Setting the LDP Hello interval values
The LDP hello interval controls how often the device sends out LDP Hello messages. Hello
messages are used to maintain LDP sessions between the device and its LDP peers. The user can
set the interval for LDP Link Hello messages (LDP Hello messages multicast to all routers on the
sub-net), as well as for LDP Targeted Hello messages (LDP Hello messages unicast to a specific
address, such as a VLL peer):
• For targeted LDP sessions – the LDP Hello Interval can only be set globally. This
configuration is described in
“Setting the LDP Hello Interval globally for targeted LDP
sessions” . When a Hello Interval is not set for Targeted LDP sessions, then the global
default value is used.
• For link LDP sessions – the LDP Hello Interval can be set globally which applies to all LDP
interfaces or on a per-interface basis. The LDP Hello Interval values in Link LDP sessions
are determined by the following procedure in the order described below.
1. When the Hello Interval is set per-interface, that value is used. This configuration is described
in “Setting the LDP Hello Interval per-Interface (link Only)” .
2. When the Hello Interval is not set per-interface, then the value set for LDPs globally is used.
This configuration is described in “Setting the LDP Hello Interval globally for link LDP sessions” .
3. When the Hello Interval is not set either globally or per-interface, the global default value is
used.
When a Hello Adjacency already exists, the adjacency remains up and any new configured interval
takes effect upon the expiration of the current Hello Interval timer. Consequently, the next and
subsequent hello messages are sent at the new interval.
Setting the LDP Hello Interval globally
The user can set a global LDP Hello Interval that applies to all LDP sessions, regardless of
interface. This is performed separately for Link and Targeted LDP sessions as described in the
following sections:
• Setting the LDP Hello Interval Globally for Link LDP Sessions
• Setting the LDP Hello Interval Globally for Targeted LDP Sessions
Setting the LDP Hello Interval globally for link LDP sessions
To set the interval for LDP Link Hello messages to 10 seconds, enter the following command.
Brocade(config-mpls)# ldp
Brocade(config-mpls-ldp)# hello-interval 10
Syntax: [no] hello-interval seconds
The seconds variable specifies the value in seconds of the Hello Interval that the user is globally
configuring for LDP Link Hello messages. The LDP hello interval can be from 1 – 32767 seconds.
The default value for LDP Link Hello messages is five seconds.
The value set here can be overridden on a per-interface basis as described in “Setting the LDP
Hello Interval per-Interface (link Only)” .
The no option removes a previously configured LDP Link Hello Interval.