D-Link DGS-3630-28SC Emulator 1 - Page 197
bgp enforce-first-as, MI and EI Mode Only
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide Command Mode Router Configuration Mode. Command Default Level Level: 12. Usage Guideline All routers in a local AS must have the same setting of this command. When the bgp always-compare-med command is enabled, the Multi Exit Discriminator (MED) will be compared for paths from neighbors in different autonomous systems. When the bgp deterministic-med command is enabled, all paths destined for the same network that are received from neighbors in the same autonomous system , will be grouped together and sorted based on the ascending MED value. The sorting is performed right after the command is entered. The best path selection algorithm will then pick the best paths using the existing rules; the comparison is made on a per-neighbor autonomous system basis and then global basis. If the bgp deterministic-med command is disabled, the paths will not be grouped and sorted. Example This example shows how to enable the compare MED value for autonomous system 65534. Switch# configure terminal Switch(config)# router bgp 65534 Switch(config-router)# bgp deterministic-med Switch(config-router)# 13-21 bgp enforce-first-as (MI and EI Mode Only) This command is used to enforce that the routes received from an eBGP peer must have the peer's AS number as the first AS in the AS path. Use the no form of this command to disable this enforcement. bgp enforce-first-as no bgp enforce-first-as Parameters None. Default By default, this option is disabled. Command Mode Router Configuration Mode. Command Default Level Level: 12. Usage Guideline Use this command to enforce that the routes received from an eBGP peer must have the peer's AS number as the first AS in the AS path. This feature is used to avoid the local router from spoofing by a misconfigured peer. 192
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