Huawei Quidway NetEngine80E Configuration Manual page 952

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Local AS number : 65001
Paths:
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:
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
Router B.
Table 8-23 Attribute comparison of the routes 10.1.4.0/30 learned from Router A and Router
B.
Route Attribute
PrefVal
Local_Pref
Route type
AIGP
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
l
l
Issue 02 (2014-09-30)
2 available, 1 best, 1 select
10.1.1.2
10.1.3.2
shows the attribute comparison of the routes 10.1.4.0/30 learned from Router A and
Route Learned
from Router A
0
-
Learned from a peer
10
AS_Sequence: records in reverse order all the ASs through which a route passes from the
local device to the destination.
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.
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.
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Route Learned
from Router B
0
-
Learned from a peer
5
8 BGP Configuration
Comparison
The same.
The same.
The same.
The same.
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