Some one pls help me navigate it. The above link i found via google
Related Commands
Command | Description |
|---|---|
Sets the maximum time that link-state packets (LSPs) can remain in a router's database without being refreshed. |
max-lsp-lifetime (IS-IS)
To set the maximum time that link-state packets (LSPs) can remain in a router's database without being refreshed, use the max-lsp-lifetime command in router configuration mode. To restore the default lifetime, use the no form of this command.
max-lsp-lifetime seconds
no max-lsp-lifetime
Syntax Description
seconds | Lifetime of the LSP in seconds. The range is 1 to 65535 seconds; the default is 1200 seconds (20 minutes). |
Defaults
1200 seconds (20 minutes)
Command Modes
Router configuration
Command History
Usage Guidelines
If the lifetime is exceeded before a refresh LSP arrives, the LSP is dropped from the database.
You might need to adjust the maximum LSP lifetime if you change the LSP refresh interval with the lsp-refresh-interval (IP) command. LSPs must be periodically refreshed before their lifetimes expire. The value set for the lsp-refresh-interval command should be less than the value set for the max-lsp-lifetime command; otherwise, LSPs will time out before they are refreshed. If you misconfigure the LSP lifetime to be too low compared to the LSP refresh interval, the software will reduce the LSP refresh interval to prevent the LSPs from timing out.
You might prefer higher values for each command in order to reduce control traffic, at the expense of holding stale LSPs from a crashed or unreachable router in the database longer (thus wasting memory) or increasing the risk of undetected bad LSPs staying active (very rare).
Examples
The following example configures an LSP lifetime of 40 minutes:
router isis
max-lsp-lifetime 2400
Related Commands
lsp-refresh-interval (IS-IS)
To set the link-state packet (LSP) refresh interval, use the lsp-refresh-interval command in router configuration mode. To restore the default refresh interval, use the no form of this command.
lsp-refresh-interval seconds
no lsp-refresh-interval
Syntax Description
seconds | Interval (in seconds) at which LSPs are refreshed.The range is 1 to 65535 seconds. The default value is 900 seconds (15 minutes). |
Defaults
900 seconds (15 minutes)
Command Modes
Router configuration
Command History
Usage Guidelines
The refresh interval determines the rate at which Cisco IOS software periodically transmits in LSPs the route topology information that it originates. This is done to keep the database information from becoming too old.
LSPs must be periodically refreshed before their lifetimes expire. The value set for the lsp-refresh-interval command should be less than the value set for the max-lsp-lifetime command; otherwise, LSPs will time out before they are refreshed. If you misconfigure the LSP lifetime to be too low compared to the LSP refresh interval, the software will reduce the LSP refresh interval to prevent the LSPs from timing out.
Reducing the refresh interval reduces the amount of time that undetected link state database corruption can persist at the cost of increased link utilization. (This is an extremely unlikely event, however, because there are other safeguards against corruption.) Increasing the interval reduces the link utilization caused by the flooding of refreshed packets (although this utilization is very small).
Examples
The following example configures the IS-IS LSP refresh interval to be 1080 seconds (18 minutes):
router isis
lsp-refresh-interval 1080
Related Commands
Command | Description |
|---|---|
Sets the maximum time that link-state packets (LSPs) can remain in a router's database without being refreshed. |
max-lsp-lifetime (IS-IS)
To set the maximum time that link-state packets (LSPs) can remain in a router's database without being refreshed, use the max-lsp-lifetime command in router configuration mode. To restore the default lifetime, use the no form of this command.
max-lsp-lifetime seconds
no max-lsp-lifetime
Syntax Description
seconds | Lifetime of the LSP in seconds. The range is 1 to 65535 seconds; the default is 1200 seconds (20 minutes). |
Defaults
1200 seconds (20 minutes)
Command Modes
Router configuration
Command History
Usage Guidelines
If the lifetime is exceeded before a refresh LSP arrives, the LSP is dropped from the database.
You might need to adjust the maximum LSP lifetime if you change the LSP refresh interval with the lsp-refresh-interval (IP) command. LSPs must be periodically refreshed before their lifetimes expire. The value set for the lsp-refresh-interval command should be less than the value set for the max-lsp-lifetime command; otherwise, LSPs will time out before they are refreshed. If you misconfigure the LSP lifetime to be too low compared to the LSP refresh interval, the software will reduce the LSP refresh interval to prevent the LSPs from timing out.
You might prefer higher values for each command in order to reduce control traffic, at the expense of holding stale LSPs from a crashed or unreachable router in the database longer (thus wasting memory) or increasing the risk of undetected bad LSPs staying active (very rare).
Examples
The following example configures an LSP lifetime of 40 minutes:
router isis
max-lsp-lifetime 2400
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