Configuring Bgp Gr - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
l
l
# Run the display bgp routing-table ip-address mask-length longer-prefixes command. The
command output shows that there are two next hops destined for 4.4.4.4/32. The route with next
hop 10.1.1.2 has a smaller MED value and therefore becomes the optimal route.
<HUAWEI> display bgp routing-table 4.4.4.4 32 longer-prefixes
BGP Local router ID is 1.1.1.1
Status codes: * - valid, > - best, d - damped,
*>
*
# Run the display ip routing-table ip-address mask-length verbose command. The command
output shows that there are two next hops destined for 4.4.4.4/32 and that 10.2.1.2 is the backup
next hop.
<HUAWEI> display ip routing-table 4.4.4.4 32 verbose
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Table : Public
Summary Count : 1
Destination: 4.4.4.4/32
RelayNextHop: 0.0.0.0
BkPETunnelID: 0x0
BkIndirectID: 0x1

8.22 Configuring BGP GR

BGP GR can be configured to avoid traffic interruption due to protocol restart.
8.22.1 Before You Start
Before configuring BGP GR, familiarize yourself with the usage scenario, complete the pre-
configuration tasks, and obtain the data required for the configuration.
Applicable Environment
BGP restart causes peer relationship reestablishment and traffic interruption. After GR is
enabled, traffic interruption can be prevented in the event of BGP restart.
Issue 02 (2014-09-30)
Run the display bgp routing-table [ network [ { mask | mask-length } [ longer-
prefixes ] ] ] command to check information in a BGP routing table.
Run the display ip routing-table [ ip-address [ mask | mask-length ] [ longer-match ] ]
verbose command to check backup forwarding entries in an IP routing table.
h - history,
Origin : i - IGP, e - EGP, ? - incomplete
Network
4.4.4.4/32
4.4.4.4/32
Protocol: EBGP
Preference: 255
NextHop: 10.1.1.2
State: Active Adv
Tag: 0
Label: NULL
IndirectID: 0x2
TunnelID: 0x0
BkNextHop: 10.2.1.2
BkLabel: NULL
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
i - internal, s - suppressed, S - Stale
NextHop MED
10.1.1.2 80
10.2.1.2 120
Process ID: 0
Cost: 80
Neighbour: 10.1.1.2
Age: 00h05m41s
Priority: low
QoSInfo: 0x0
Interface: Pos1/0/0
Flags: D
BkInterface: Pos1/0/1
SecTunnelID: 0x0
BkPESecTunnelID: 0x0
8 BGP Configuration
LocPrf PrefVal Path/Ogn
0 200i
0 200i
860