Connectivity Guide

Default Disabled
Command Mode ROUTER-NEIGHBOR
Usage Information Congure 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
fast-external-fallover
Resets BGP sessions immediately when a link to a directly connected external peer fails.
Syntax
fast-external-fallover
Parameters None
Default Not congured
Command Mode ROUTER-BGP
Usage Information Fast external fall-over terminates the EBGP session immediately after the IP unreachability or link failure is
detected. This only applies after you manually reset all existing BGP sessions. For the conguration to take eect,
use the clear ip bgp command. The no version of this command disables fast external fallover.
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-10)# fast-external-fallover
Supported Releases 10.3.0E or later
inherit template
Congures a peer group template name that the neighbors use to inherit peer-group conguration.
Syntax
inherit template template-name
Parameters template-name — Enter a template name. A maximum of 16 characters.
Default Not congured
Command Mode ROUTER-NEIGHBOR
Usage Information When network neighbors inherit a template, all features enabled on the template are also supported on the
neighbors. The no version of this command disables the peer group template conguration.
Example
OS10(conf-router-neighbor)# inherit template zanzibar
Supported Releases 10.2.0E or later
474 Layer 3