Connectivity Guide

Supported Releases 10.3.0E or later
ebgp-multihop
Allows EBGP neighbors on indirectly connected networks.
Syntax
ebgp-multihop hop count
Parameters hop count — Enter a value for the number of hops, from 1 to 255.
Default 1
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-rst-as
Enforces the rst AS in the AS path of the route received from an EBGP peer to be the same as the congured 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 ap. For updates received from EBGP peers,
BGP ensures that the rst AS of the rst AS segment is always the AS of the peer, otherwise the update drops
and the counter increments. The no version of this command turns o the default.
NOTE: To congure these settings for a non default VRF instance, you must rst 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
Layer 3 473