D-Link DGS-3630-28SC User Manual 1 - Page 370

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide Parameter Scan Time Keep-Alive Interval Hold Time Always Compare MED Deterministic MED Default Local Preference MED Confed AS Path Ignore Compare Router ID MED Missing AS Worst Compare Confederation Path Fast External Failover Aggregate Next Hop Check Default IPv4 Unicast Graceful Restart State Description Enter the scan time value here. When the router is enabled for scanning next hop of BGP routes, the router will periodically check whether there is a route to reach the next hop in the routing table. The range is from 5 to 60 seconds. Enter the keep-alive interval value here. This specifies the interval that the software uses to send keep-alive messages to BGP peers. The range is from 0 to 65535 seconds. Enter the hold time value here. This specifies the length of time to timeout the keep-alive message. The software will declare a BGP peer dead after the timeout. The range is from 0 to 65535 seconds. Select the enable or disable the always compare Multi Exit Discriminator (MED) feature here. This is used in comparing the MED in best path selection for paths that are advertised from neighbors in either the same or different autonomous systems. Select to enable or disable the deterministic MED feature here. This is used to compare the MED value between all paths received from within the same autonomous system in the selection of the best route selection. Enter the default local preference value here. The local preference is used to control the preferred exit point from the local AS to the same destination network. The local preference will be sent with the route advertised to the iBGP peers. If an external route is both reachable via the local router and an iBGP peer router, the local preference value determines the preferred exit point to reach the external route. The range is from 0 to 4294967295. Select the enable or disable the MED confederation feature here. When enabled, 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. Select to enable or disable the AS path ignore feature here. When enabled, this feature is used to ignore the AS path as a discriminating factor in the selection of the best path. Select to enable or disable the compare router ID feature here. This is used to configure a BGP process to use the router ID as a tie breaker in best path selection. If this is enabled, the path with lowest router ID will be selected as the best when all other attributes are equal. Select to enable or disable the MED missing AS worst feature here. This is used to configure the BGP process to assign an infinite value to the route if the MED is missed. Select to enable or disable the compare confederation path feature here. When enabled, the BGP process will compare the confederation AS path length in best path selection. The path with shorter the confederation AS path length is preferred. Select to enable or disable the fast external failover feature here. This is used to globally enable or disable the fast external failover of BGP sessions for the directly connected external peers. When enabled, the session is immediately reset if the link goes down. When disabled, the session will not be reset until the default hold timer expires. Select to enable or disable the aggregate next hop check feature here. This is used to enable the checking of next hop of the BGP aggregated routes. Only the routes with the same next hop attribute can be aggregated if the BGP aggregate next hop check is enabled. Select to enable or disable the default IPv4 unicast feature here. This is used to enable the exchange of IPv4 unicast routing information. Select to enable or disable the BGP graceful restart capabilities for all BGP neighbors here. 358