Configuring Bgp Soft Reset - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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8.6.4 Configuring BGP Soft Reset

BGP soft reset allows the system to refresh a BGP routing table dynamically without tearing
down any BGP connection if routing policies are changed.
Context
After changing a BGP import policy, you must reset BGP connections for the new import policy
to take effect, interrupting these BGP connections temporarily. BGP route-refresh allows the
system to refresh a BGP routing table dynamically without tearing down any BGP connection
if routing policies are changed.
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Procedure
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Issue 02 (2014-09-30)
NOTE
If the number of routes received by the local router exceeds the upper limit and the peer route-
limit command is used for the first time, the local router and its peer reestablish the peer relationship,
regardless of whether alert-only is set.
If a device's peer supports route-refresh, the refresh bgp command can be used on the
device to softly reset the BGP connection with the peer and update the BGP routing table.
If a device's peer does not support route-refresh, the peer keep-all-routes command can
be used on the device to remain all routing updates received from the peer so that the device
can refresh its routing table without closing the connection with the peer.
If the device's peers support route-refresh, perform the following operations:

1.

(Optional) Enable route-refresh.
a. Run:
system-view
The system view is displayed.
b. Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
c. Run:
peer { ipv4-address | group-name } capability-advertise route-refresh
Route-refresh is enabled.
By default, route-refresh is enabled.
If route-refresh is enabled on all BGP devices and the import policy of the local device
is changed, the local device 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 device. This enables the local device 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 | vpnv4 |
vpn-target | l2vpn-ad ] { all | ipv4-address | group group-name | external |
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