Configuring Parameters Of A Connection Between Bgp4+ Peers - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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9.5 Configuring Parameters of a Connection Between BGP4
+ Peers
By setting parameters of a connection between BGP4+ peers, you can adjust and optimize the
BGP4+ network performance.
9.5.1 Before You Start
Before configuring parameters of a connection between BGP4+ peers, familiarize yourself with
the usage scenario, complete the pre-configuration tasks, and obtain the required data. This can
help you complete the configuration task quickly and accurately.
Applicable Environment
After a BGP4+ connection is set up between peers, the peers periodically send Keepalive
messages to each other. This prevents the routers from considering that the BGP4+ connection
is closed. If a router does not receive any Keepalive message or any type of packets from the
peer within the specified Hold time, the BGP4+ connection is considered as closed.
When a router sets up a BGP4+ connection with its peer, the router and the peer need negotiation
with each other. The Hold time after negotiation is the shorter one between the Hold time of the
router and that of its peer. If the negotiation result is 0, no Keepalive message is transmitted and
whether the Hold timer expires is not detected.
If the value of the timer changes, the BGP4+ connection is interrupted for a short time as the
router and its peer need negotiate again.
A ConnectRetry timer is used to set the interval between BGP4+ attempts to initiate TCP
connections. After BGP4+ initiates a TCP connection, the ConnectRetry timer is stopped if the
TCP connection is established successfully. If the first attempt to establish a TCP connection
fails, BGP4+ tries again to establish the TCP connection after the ConnectRetry timer expires.
You can speed up or slow down the establishment of BGP4+ peer relationships by changing the
BGP4+ ConnectRetry interval. For example, if the ConnectRetry interval is reduced, BGP4+
will wait less time to retry establishing a TCP connection when an earlier attempt fails. This
speeds up the establishment of the TCP connection. If a BGP4+ peer flaps constantly, the
ConnectRetry interval can be increased to suppress route flapping caused by BGP4+ peer
flapping. This speeds up route convergence.
Issue 02 (2014-09-30)
Run the display bgp ipv6 routing-table as-path-filter { as-path-filter-number | as-path-
filter-name } command to check the routes matching the specified AS-Path filter.
Run the display bgp ipv6 routing-table community-filter { { community-filter-name |
basic-community-filter-number } [ whole-match ] | advanced-community-filter-number }
command to check the routes matching the specified BGP4+ community filter.
Run the display bgp ipv6 routing-table peer { ipv4-address | ipv6-address } { advertised-
routes | received-routes } [ statistics ] command to check the routing information
advertised or received by the BGP4+ peers.
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9 BGP4+ Configuration
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