HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 137
Specifying LSP lengths, Enabling LSP flash flooding, Enabling LSP fragment extension
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Step Command 2. Enter interface view. interface interface-type interface-number 3. Specify the minimum interval for sending LSPs and the maximum LSP isis timer lsp time [ count number that can be sent at a count ] time. Remarks N/A By default, the minimum interval is 33 milliseconds, and the maximum LSP number that can be sent at a time is 5. Specifying LSP lengths IS-IS messages cannot be fragmented at the IP layer because they are directly encapsulated in frames. IS-IS routers in an area must send LSPs smaller than the smallest interface MTU in the area. If the IS-IS routers have different interface MTUs, HP recommends configuring the maximum size of generated LSP packets to be smaller than the smallest interface MTU in the area. Otherwise, the routers must dynamically adjust the LSP packet size to fit the smallest interface MTU, which takes time and affects other services. To specify LSP lengths: Step 1. Enter system view. 2. Enter IS-IS view. 3. Specify the maximum length of generated Level-1 LSPs or Level-2 LSPs. 4. Specify the maximum length of received LSPs. Command system-view isis [ process-id ] [ vpn-instance vpn-instance-name ] lsp-length originate size [ level-1 | level-2 ] lsp-length receive size Remarks N/A N/A By default, the maximum length of generated Level-1 LSPs or Level-2 LSPs is 1497 bytes. By default, the maximum length of received LSPs is 1497 bytes. Enabling LSP flash flooding Changed LSPs can trigger SPF recalculation. To advertise the changed LSPs before the router recalculates routes for faster network convergence, enable LSP flash flooding. To enable LSP flash flooding: Step 1. Enter system view. 2. Enter IS-IS view. 3. Enable LSP flash flooding. Command system-view isis [ process-id ] [ vpn-instance vpn-instance-name ] flash-flood [ flood-count flooding-count | max-timer-interval flooding-interval | [ level-1 | level-2 ] ] * Remarks N/A N/A By default, LSP flash flooding is disabled. Enabling LSP fragment extension Perform this task to enable IS-IS fragment extension for an IS-IS process. The MTUs of all interfaces running the IS-IS process must not be less than 512. Otherwise, LSP fragment extension does not take effect. To enable LSP fragment extension: 126