D-Link DGS-3620-52P Web UI Reference Guide - Page 243

xStack® DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide Best Path Option Choose from AS Path Ignore, Compare Router ID, Med Confed, MED Missing As Worst, and Compare Confed Aspath. AS Path Ignore - If selected, the BGP process will ignore the AS path in the path selection process. Compare Router ID - If selected, the BGP process will include the router ID in the path selection process. Similar routes are compared and the route with the lowest router ID is selected. Med Confed - If selected, the BGP process will compare the MED for the routes that are received from confederation peers. For routes that have an external AS in the path, the comparison does not occur. MED Missing As Worst - If selecteded, the BGP process will assign a value of infinity to routes that are missing the Multi Exit Discriminator (MED) attribute. If disabled, the BGP process will assign a value of zero to routes that are missing the Multi Exit Discriminator (MED) attribute, causing this route to be chosen as the best path. Compare Confed Aspath - If selected, the BGP process will compare the confederation AS path length of the routes received. The shorter the confederation AS path length, the better the route is. Best Path Option State Used the drop-down menu to enable or disable AS Path Ignore, Compare Router ID, Med Confed, MED Missing As Worst, and Compare Confed Aspath. The default is Disabled. Default Local Preference (0-4294967295) Enter a default local preference between 0 and 4294967295. The default value is 100. Router Identifier This field is used to set BGP router ID. An ID to identify a BGP router. If it is set to zero the router ID will be automatically determined. User must specify a unique router ID within the network. Hold Time (0-65535) The valid values are from 0 to 65535. The system will declare a peer as dead if a keepalive message is received that is more than the hold time. The default value is 180 seconds. If the holdtime is set to zero, then the holdtime will never expire. If the two routers that build a BGP connection have a different hold time, then the smaller hold time will be used. If the timer is specified for specific neighbors, then the neighbor specific timer will take effect. The hold time needs to be at least three times that of the keepalive timer. Keepalive Time (0-65535) The valid values are from 0 to 65535. This specifies the interval at which keepalive messages are sent to its peer. If the keepalive value is set to zero, then the keepalive message will not be sent out. The default value is 60 seconds. If the two routers that build a BGP connection have a different keepalive timer, then the smaller keepalive timer will be used. If the timer is specified for specific neighbors, then the neighbor specific timer will take effect. Scan Timer (5-60) Enter the BGP scan timer value from 5 to 60 seconds or tick the Default check box. The default value is 60 seconds. Fast External Fallover Enable or disable fast external fallover. This configures a Border Gateway Protocol (BGP) routing process to immediately reset its external BGP peer sessions if the link used to reach these peers goes down. The default state is Enabled. Aggregate Next Hop Check Enable or disable aggregate next hop check. This is used to configure the BGP aggregated routes' next hop check. Only the routes with the same next hop attribute can be aggregated if the BGP aggregate next hop check is Enabled. The default state is Disabled. Click the Apply button to accept the changes made for each individual section. BGP Aggregate Address Settings This window is used to create an aggregate entry in the Border Gateway Protocol (BGP) database. 233