Huawei Quidway NE40E, Configuration Manual, Page: 952 / 1301

Local AS number : 65001
Paths: 2 available, 1 best, 1 select
BGP routing table entry information of 10.1.4.0/30:
From: 10.1.3.2 (10.1.5.1)
Route Duration: 00h00m14s
Direct Out-interface: GigabitEthernet0/0/0
Original nexthop: 10.1.3.2
Qos information : 0x0
AS-path 65002, origin incomplete, MED 2, pref-val 0, valid, external, best,
select, active, pre 255,
AIGP 5
Advertised to such 2 peers:
10.1.1.2
10.1.3.2
BGP routing table entry information of 10.1.4.0/30:
From: 10.1.1.2 (10.1.1.2)
Route Duration: 01h01m15s
Direct Out-interface: GigabitEthernet0/0/1
Original nexthop: 10.1.1.2
Qos information : 0x0
AS-path 65002, origin incomplete, MED 2, pref-val 0, valid, external, pre 255,
AIGP 10 , not preferred for AIGP
Not advertised to any peer yet
The preceding command output shows that Router E selects the route 10.1.4.0/30 learned from
Router B because its AIGP value is smaller than that of the route learned from Router A.
Table 8-23 shows the attribute comparison of the routes 10.1.4.0/30 learned from Router A and
Router B.
Table 8-23 Attribute comparison of the routes 10.1.4.0/30 learned from Router A and Router
B.
Route Attribute Route Learned
from Router A Route Learned
from Router B Comparison
PrefVal 0 0 The same.
Local_Pref - - The same.
Route type Learned from a peer Learned from a peer The same.
AIGP 10 5 The same.
AS_Path
BGP prefers the route with the shortest AS_Path length (the number of included ASs) during
BGP route selection.
Four types of AS_Path attributes are available:
l AS_Sequence: records in reverse order all the ASs through which a route passes from the
local device to the destination.
l AS_Set: records in random order all the ASs through which a route passes from the local
device to the destination. The AS_Set attribute is used in route summarization scenarios.
l AS_Confed_Sequence: records in reverse order all the sub-ASs within a BGP confederation
through which a route passes from the local device to the destination.
HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
8 BGP Configuration
Issue 02 (2014-09-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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