H3C Technologies H3C S12500 Series Switches - Manual (Page 35)

27
LSP timer Functionality Tuning guidelines
LSP fast-flooding
Floods the first several LSPs that invoke
SPF before SPF computation is started. Enable this feature for quick LSDB
synchronization.
Configuring the minimum LSP transmit interval and the maximum number of LSPs sent at each interval
To control ISIS-SPB traffic on a circuit, tune the minimum interval for the device to transmit LSPs out of the
circuit and the maximum number of LSPs sent at each interval. Before the minimum interval expires, newly
generated LSP updates must wait in queue before they can be sent out.
To control ISIS-SPB traffic on the SPBM network:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
N/A
3. Configure the minimum LSP
transmit interval and the
maximum number of LSP
segments sent at each
interval.
spbm timer lsp time [ count count ]
By default, the minimum LSP
transmit interval is 33 milliseconds.
A maximum of five LSP segments
can be sent at each interval.
NOTE:
ISIS-SPB requires acknowledgment for each LSP sent on a point-to-point circuit. ISIS-SPB will retransmit an
LSP at 5-second interval until it receives an acknowledgment for the LSP. This retransmission interval is not
user configurable.
Configuring the LSP lifetime
The LSP lifetime specifies the maximum amount of time for an LSP to be retained in an LSDB.
SPBM nodes add a lifetime in each LSP they have advertised. If an SPBM node does not receive an
update for an LSP before its lifetime expires, the SPBM node removes the LSP from the LSDB.
To configure the maximum LSP lifetime:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter SPBM view. spbm N/A
3. Configure the maximum LSP
lifetime.
timer lsp-max-age seconds
The default maximum LSP
lifetime is 1200 seconds.
Tuning the LSP refresh interval and LSP generation timer
To prevent LSPs from age-out and synchronize LSDBs, ISIS-SPB performs periodic and event-driven LSP
updates:
• LSP refresh interval—Sets the interval at which ISIS-SPB regularly regenerates an LSP, regardless of
whether any change has occurred to the LSP.