D-Link DGS-3630 User Manual 1 - Page 409

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide Parameter LSP Generation Interval Level-2 LSP Refresh Interval Max Area Addresses Max LSP Lifetime Metric Style Description Enter the LSP generation interval level-2 value here. This is used to configure the interval of link-state packet generation in level 2 areas only. Use this to reduce the rate of LSP generation during periods of instability in the network. This can help to reduce CPU load on the router and to reduce the number of LSP transmissions to ISIS neighbors. The range is from 1 to 120 seconds. Select the Default option to use the default value. Enter the LSP refresh interval value here. This is used to configure the interval of link-state packet regeneration. LSPs must be periodically refreshed before their lifetimes expire. The value configured here should be less than the value configured using the Max LSP Lifetime parameter; otherwise, LSPs will time out before they are refreshed. Misconfiguring the LSP lifetime to be too low compared to the LSP refresh interval, will result in the software reducing the LSP refresh interval to prevent the LSPs from timing out. Reducing the refresh interval reduces the amount of time undetected link-state database corruption can persist at the cost of increased link utilization. Increasing the interval reduces the link utilization caused by the flooding of refreshed packets. The range is from 1 to 65535 seconds. Select the Default option to use the default value. Enter the maximum area addresses value here. Use this to maximize the size of an ISIS area by configuring additional manual addresses. The range is from 3 to 254. Select the Default option to use the default value. Enter the maximum LSP lifetime value here. This is used to configure the maximum lifetime value of link-state packets. The range is from 1 to 65535 seconds. Select the Default option to use the default value. Select the metric style here. This is used configure the ISIS process generation and metric style acceptation. Options to choose from are: • Narrow - Specifies to generate old-style metric TLVs. • Wide - Specifies to generate new-style metric TLVs. • Narrow Transition - Specifies to generate old-style metric TLVs and to accept both old and new-style metric TLVs. • Wide Transition - Specifies to generate new-style metric TLVs and to accept both old and new-style metric TLVs. • Transition - Specifies to generate both old and new-style metric TLVs. Also for each metric style, the level can be selected. Options to choose from are: • Level-1 - Specifies to enable this only on level 1 routing. • Level-1-2 - Specifies to enable this on both level 1 and level 2 routing. • Level-2 - Specifies to enable this only on level 2 routing. Set Overload Bit On Startup Select to enable or disable the set overload bit feature here. This is used to force the ISIS process to set the overload bit in its non-pseudo node LSPs. Normally, the setting of the overload bit is allowed only when a router runs into problems. For example, when a router is experiencing a memory shortage, it might be that the LSPDB isn't complete, resulting in an incomplete or inaccurate routing table. By setting the overload bit in its LSPs, other router can ignore the unreliable router in their SPF calculations until the router has recovered from its problems. Enter the set overload bit on startup time value here. This specifies to configure the overload bit upon the system when starting up. The overload bit remains 397