Deployment Guide

IPv6 BGP Commands
IPv6 Border Gateway Protocol (IPv6 BGP) is supported on the switch.
Border gateway protocol (BGP) is an external gateway protocol that transmits interdomain routing information within and between
autonomous systems (AS). BGP version 4 (BGPv4) supports classless interdomain routing and the aggregation of routes and AS paths.
Basically, two routers (called neighbors or peers) exchange information including full routing tables and periodically send messages to
update those routing tables.
bgp soft-recong-backup
To avoid the peer from resending messages, use this command only when route-refresh is not negotiated.
Syntax
bgp soft-reconfig-backup
To return to the default setting, use the no bgp soft-reconfig-backup command.
Defaults Disabled
Command Modes ROUTER BGP
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
When you enable soft-reconguration for a neighbor and you execute the clear ip bgp soft in command,
the update database stored in the router is replayed and updates are re-evaluated. With this command, the replay
and update process is triggered only if route-refresh request is not negotiated with the peer. If the request is
indeed negotiated (after executing the clear ip bgp soft in command), BGP sends a route-refresh
request to the neighbor and receives all of the peer’s updates.
Related Commands clear ip bgp — activates inbound policies without resetting the BGP TCP session.
clear ip bgp ipv6 unicast soft
Clear and reapply policies for IPv6 unicast routes without resetting the TCP connection; that is, perform BGP soft reconguration.
Syntax
clear ip bgp {* | as-number | ipv4-neighbor-addr | ipv6-neighbor-addr | peer-
group name} ipv6 unicast soft [in | out]
Parameters
* Clear and reapply an asterisk ( * ) for all BGP sessions.
as-number Clear and reapply policies for all neighbors belonging to the AS. The range is from 0 to
65535 (2 Byte), from 1 to 4294967295 (4 Byte), or from 0.1 to 0.65535.65535 (Dotted
format).
ipv4-neighbor-addr
| ipv6-neighbor-
addr
Clear and reapply policies for a neighbor.
Border Gateway Protocol IPv4 (BGPv4) 365