Huawei S6700 Series Configuration Manual page 412

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
l
----End
Issue 01 (2012-03-15)
If route-refresh is enabled on all BGP switches and the import policy of the local
switch is changed, the local switch sends a route-refresh message to peers or peer
groups. After receiving the message, the peers or peer groups resend routing
information to the local BGP switch. This enables the local switch to dynamically
refresh its BGP routing table and apply the new routing policy without closing any
BGP connections.
2. Configure BGP soft reset.
a. Run the refresh bgp [ vpn-instance vpn-instance-name ipv4-family ] { all |
ipv4-address | group group-name | external | internal } { export | import }
command in the user view to softly reset the BGP connections between the
devices and its peers or peer groups.
external softly resets an EBGP connection, and internal softly resets an IBGP
connection.
export triggers outbound BGP soft reset, and import triggers inbound BGP soft reset.
If the device's peers do not support route-refresh, perform the following operations:
– Configure the device to store all the routing updates received from its peers or peer
groups.
1. Run:
system-view
The system view is displayed.
2. Run:
bgp as-number
The BGP view is displayed.
3. Run:
ipv4-family unicast
The IPv4 unicast address family view is displayed.
4. Run:
peer { ipv4-address | group-name } keep-all-routes
The device is configured to store all the routing updates received from its peers
or peer groups.
By default, the device stores only the routing updates that are received from peers or
peer groups and match a configured import policy.
After this command is used, all routing updates sent by a specified peer or peer group
are stored, regardless of whether an import policy is used. When the local routing
policy changes, the information can be used to regenerate BGP routes again.
NOTE
This command must be run on the local device and its peers. If the peer keep-all-routes
command is run on the device for the first time, the sessions between the device and its peers
are reestablished.
The peer keep-all-routes command does not need to be run on the switch that supports route-
refresh. If the peer keep-all-routes command is run on the switch, the sessions between the
switch and its peers will not be reestablished but the refresh bgp command does not take effect
on the switch.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
7 BGP Configuration
393