Dell PowerSwitch S4112F-ON EMC SmartFabric OS10 User Guide Release 10.5.0 - Page 607

Parameters hop count - Enter a value for the number of hops, from 1 to 255. Default 1 for eBGP. 255 for iBGP. Command Mode ROUTER-NEIGHBOR Usage Information 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. Example 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 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. NOTE: To configure these settings for a non default VRF instance, you must first enter the ROUTER-CONFIG-VRF sub mode using the following commands: 1. Enter the ROUTER BGP mode using the router bgp as-number command. 2. From the ROUTER BGP mode, enter the ROUTER BGP VRF mode using the vrf vrf-name command. 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 fall-over Parameters None Default Disabled Command Mode ROUTER-NEIGHBOR Usage Information 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. Example OS10(conf-router-neighbor)# fall-over Supported Releases 10.3.0E or later Layer 3 607