Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 307

Command Mode Usage Information Example ROUTER-NEIGHBOR This command avoids installation of default multihop peer routes to prevent loops and creates neighbor relationships between peers. Networks indirectly connected are not valid for best path selection. The no version of this command removes multihop session. OS10(conf-router-neighbor)# ebgp-multihop 2 Supported Releases 10.3.0E or later enforce-first-as Enforces the first AS in the AS path of the route received from an external border gateway protocol (EBGP) peer to be the same as the configured remote AS. Syntax enforce-first-as Parameters None Default Enabled Command Mode ROUTER-BGP Usage Information To verify statistics of routes rejected, use the show ip bgp neighbors command. If routes are rejected, the session is reset. In the event of a failure, the existing BGP sessions flap. For updates received from EBGP peers, BGP ensures that the first AS of the first AS segment is always the AS of the peer, otherwise the update drops and the counter increments. The no version of this command turns off the default. Example OS10(conf-router-bgp-1)# enforce-first-as Supported Releases 10.3.0E or later fall-over Enables or disables BGP session fast fall-over for BGP neighbors. Syntax Parameters Default Command Mode Usage Information Example fall-over None Disabled ROUTER-NEIGHBOR Configure the BGP fast fall-over on a per-neighbor or peer-group basis. When you enable this command on a template, it simultaneously enables on all peers that inherit the peer group template. When you enable fall-over, BGP tracks IP reachability to the peer remote address and the peer local address. Whenever either address becomes unreachable - no active route exists in the routing table for peer IPv6 destinations or local address - BGP brings down the session with the peer. The no version of this command disables fall-over. OS10(conf-router-neighbor)# fall-over Supported Releases 10.3.0E or later Layer 3 307