Huawei Quidway NetEngine80E Configuration Manual page 967

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
*>
*
[RouterB] display bgp routing-table
BGP Local router ID is 10.1.2.1
Status codes: * - valid, > - best, d - damped,
Total Number of Routes: 2
*>
*
The preceding command output shows that both ISP1 and ISP2 select the route learned from
Router C as the optimal route. As a result, Router C and Router D cannot load-balance the traffic
from ISP1 or ISP2 to 1.1.1.1/32.
Run the display bgp routing-table ip-address command on Router B to check the reason why
Router B chooses the route learned from Router C.
[RouterB] display bgp routing-table 1.1.1.9
BGP local router ID : 10.1.2.1
Local AS number : 200
Paths:
BGP routing table entry information of 1.1.1.9/32:
From: 10.1.4.2 (10.1.1.2)
Route Duration: 00h00m58s
Direct Out-interface: GigabitEthernet0/0/2
Original nexthop: 10.1.4.2
Qos information : 0x0
AS-path 65001, origin igp, pref-val 0, valid, external, best, select, active, pre
255
Advertised to such 2 peers:
BGP routing table entry information of 1.1.1.9/32:
From: 10.1.2.2 (10.1.2.2)
Route Duration: 00h01m07s
Direct Out-interface: GigabitEthernet0/0/0
Original nexthop: 10.1.2.2
Qos information : 0x0
AS-path 65001, origin igp, pref-val 0, valid, external, pre 255, not preferred for
router ID
Not advertised to any peer yet
The preceding command output shows that Router B selects the route learned from Router C
because the router ID (10.1.1.2) of Router C is smaller than that (10.1.2.2) of Router D.
8-29
Table 8-29 Attribute comparison of the routes learned from Router C and Router D
Route Attribute
PrefVal
Local_Pref
Route type
Issue 02 (2014-09-30)
1.1.1.9/32
h - history,
Origin : i - IGP, e - EGP, ? - incomplete
Network
1.1.1.9/32
2 available, 1 best, 1 select
10.1.2.2
10.1.4.2
describes the attribute comparison of the routes learned from Router C and Router D.
Route Learned
from Router C
0
-
Learned from a peer
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10.1.1.2
10.1.3.2
i - internal, s - suppressed, S - Stale
NextHop MED
10.1.4.2
10.1.2.2
Route Learned
from Router D
0
-
Learned from a peer
8 BGP Configuration
0 65001i
0 65001i
LocPrf PrefVal Path/Ogn
0 65001i
0 65001i
Comparison
The same.
The same.
The same.
Table
942