Connectivity Guide
Default Disabled
Command Mode ROUTER-NEIGHBOR
Usage Information Congure 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 congured
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 conguration to take eect,
use the clear ip bgp command. The no version of this command disables fast external fallover.
NOTE: To congure 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
Congures a peer group template name that the neighbors use to inherit peer-group conguration.
Syntax
inherit template template-name
Parameters template-name — Enter a template name. A maximum of 16 characters.
Default Not congured
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 conguration.
Example
OS10(conf-router-neighbor)# inherit template zanzibar
Supported Releases 10.2.0E or later
474 Layer 3