Configuring Bgp Soft Reset - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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8.5.4 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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specify the action permit in this rule to receive or advertise the other
routes.
Route filtering using a whitelist: Configure a rule with a smaller number
and specify the action permit in this rule to permit the routes to be received
or advertised by the system. Then, configure another rule with a larger
number in the same ACL and specify the action deny in this rule to filter
out unwanted routes.
– To filter routes based on an IP prefix list, run the peer { ipv4-address | group-
name } ip-prefix ip-prefix-name export command.
– To filter routes based on an AS_Path filter, run the peer { ipv4-address | group-
name } as-path-filter { as-path-filter-number | as-path-filter-name } export
command.
– To filter routes based on a route-policy, run the peer { ipv4-address | group-
name } route-policy route-policy-name export command.
A peer group and its members can use different export policies to filter routes. Each
peer can select its policy when advertising routes.
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:
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8 BGP Configuration
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