D-Link DGS-3620-52P Web UI Reference Guide - Page 242

xStack® DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide BGP Global Settings This window is used to configure BGP state, AS number, and global settings. To view the following window, click L3 Features > BGP > BGP Global Settings, as shown below: Figure 5-1089 BGP Global Settings window The fields that can be configured are described below: Parameter Description BGP AS Number Action Use the drop-down menu to Add or Delete the BGP AS number. When the BGP protocol starts, it must belong to a single AS. The user must set the AS number before configuring any of the other attributes. When the BGP process is deleted, all peers and routes information from BGP will be deleted. Route entries redistributed from BGP must also be canceled. BGP AS Number (1-65535) Enter a BGP AS number between 1 and 65535. BGP State Use the drop-down menu to enable or disable the Border Gateway Protocol state. By disabling the BGP protocol, all peers will be disconnected and dynamic routes will be deleted. All the static configurations however will be reserved. If BGP is enabled again, the previous configurations can be re-applied. Synchronization Usually, a BGP speaker does not advertise a route to an external neighbor unless that route is local or exists in the IGP. By default, synchronization between BGP and the IGP is turned off to allow the BGP to advertise a network route without waiting for route validation from the IGP. This feature allows routers and access servers within an Autonomous System to have the route before BGP makes it available to other autonomous systems. Enforce First AS This command is used to enforce the neighbor's AS as the first AS in the AS list. When the setting is Enabled, any updates received from an external neighbor that do not have the neighbor's configured Autonomous System (AS) at the beginning of the AS_PATH in the received update, will be denied and the neighbor will be closed. Enabling this feature adds to the security of the BGP network by not allowing traffic from unauthorized systems. Always compare MED Enable or disable the comparison of the Multi Exit Discriminator (MED) for paths from the neighbors in different Autonomous Systems. By default this setting is Disabled. Deterministic MED Enable or disable to enforce the deterministic comparison of the Multi Exit Discriminator (MED) for paths received from the neighbors within the same Autonomous System. By default this setting is Disabled. 232