Huawei Quidway NetEngine80E Configuration Manual page 981

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
select, pre 255, IGP cost 2
Originator:
Cluster list: 0.0.0.3
Not advertised to any peer yet
BGP routing table entry information of 10.1.4.0/30:
From: 10.1.1.2 (2.2.2.9)
Route Duration: 00h00m17s
Relay IP Nexthop: 10.1.1.2
Relay IP Out-Interface: GigabitEthernet0/0/0
Original nexthop: 10.1.2.2
Qos information : 0x0
AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, valid, internal, pre
255, IGP cost 2, not preferred for router ID
Originator:
Cluster list: 0.0.0.2
Not advertised to any peer yet
The preceding command output shows that the route learned from Router B is not selected due
to a router ID issue. In fact, the router ID of Router B is 2.2.2.9, smaller than that (3.3.3.9) of
Router C. The route learned from Router B should be selected if the router IDs are used to
determine the optimal route. However, the routes carry Originator_ID attributes. In this situation,
the Originator_ID attributes (rather than router IDs) are compared. Router A selects the route
learned from Router C because its Originator_ID (10.1.4.1) is smaller than that (10.1.4.2) of the
route learned from Router B.
Table 8-33
C.
Table 8-33 Attribute comparison of the routes learned from Router B and Router C
Route Attribute
PrefVal
Local_Pref
Route type
AIGP
AS_Path
Origin
MED
Peer type
IGP cost
Cluster_List
Originator_ID
Issue 02 (2014-09-30)
10.1.4.1
10.1.4.2
describes the attribute comparison of the routes learned from Router B and Router
Route Learned
from Router B
0
100
Learned from a peer
-
-
IGP
0
IBGP
2
0.0.0.2
10.1.4.2
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Route Learned
from Router C
0
100
Learned from a peer
-
-
IGP
0
IBGP
2
0.0.0.3
10.1.4.1
8 BGP Configuration
Comparison
The same.
The same.
The same.
The same.
The same length.
The same.
The same.
The same.
The same.
The same length.
The route learned
from Router C is
optimal.
956