组网需求
- 路由器R1、R2、R3都是双主控设备，主用板和备用板之间形成备份关系，路由器之间通过OSPF路由协议形成互联，提供GR机制
- 要求：当R1通过GR方式重启OSPF进程或者主备倒换时转发不中断
组网拓扑
配置思路
- 配置路由器基本功能以及各个接口地址
- 配置OSPF路由协议
- 配置GR
配置命令
配置路由器基本功能以及各个接口地址
R1配置
1
2
3
4
5
6sys
sys R1
int g0/0/0
ip add 10.1.12.1 30
int g0/0/1
ip add 10.1.13.1 30
R2配置
1
2
3
4sys
sys R2
int g0/0/0
ip add 10.1.12.2 30
R3配置
1
2
3
4sys
sys R3
int g0/0/1
ip add 10.1.13.2 30
配置OSPF路由协议
R1配置
1
2
3
4
5sys
ospf 1 router-id 10.1.1.1
area 0
network 10.1.13.0 0.0.0.3
network 10.1.12.0 0.0.0.3
R2配置
1
2
3
4sys
ospf 1 router-id 10.2.2.2
area 1
network 10.1.12.0 0.0.0.3
R3配置
1
2
3
4sys
ospf 1 router-id 10.3.3.3
area 0
network 10.1.13.0 0.0.0.3
配置GR
R1配置
1
2
3
4sys
ospf 1
opeque-capability enable
graceful-restart
R2配置
1
2
3
4sys
ospf 1
opeque-capability enable
graceful-restart
R3配置
1
2
3
4sys
ospf 1
opeque-capability enable
graceful-restart
查看结果
查看路由器上OSPF GR的状态
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22display ospf 1 graceful-restart
<R1>display ospf 1 graceful-restart
OSPF Process 1 with Router ID 10.1.1.1
Graceful-restart capability : enabled
Graceful-restart support : planned and un-planned, totally
Helper-policy support : planned and un-planned, strict lsa check
Current GR state : normal
Graceful-restart period : 120 seconds
Number of neighbors under helper:
Normal neighbors : 0
Virtual neighbors : 0
Sham-link neighbors : 0
Total neighbors : 0
Number of restarting neighbors : 0
Last exit reason:
On graceful restart : none
On Helper : none
R1重启OSPF进程，查看R2的邻居状态
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28reset ospf 1 process graceful-restart
Jun 20 2022 15:04:46-08:00 R2 %%01OSPF/4/RECV_FIRST_GLSA(l)[6]:OSPF 256 attempte
d to enter helper mode and received first grace LSA from neighbor 1.1.1.10, on i
nterface 2.12.1.10.
<R2>display ospf peer
Jun 20 2022 15:04:46-08:00 R2 %%01OSPF/4/ENTER_HELPER_MODE(l)[7]:OSPF 256 neighb
or 10.1.1.1 enters helper on interface 2.12.1.10.
display ospf peer
<R2>display ospf peer
OSPF Process 1 with Router ID 10.2.2.2
Neighbors
Area 0.0.0.1 interface 10.1.12.2(GigabitEthernet0/0/0)'s neighbors
Router ID: 10.1.1.1 Address: 10.1.12.1 GR State: Doing GR
State: Full Mode:Nbr is Slave Priority: 1
DR: 10.1.12.2 BDR: 10.1.12.1 MTU: 0
Dead timer due in 27 sec
Retrans timer interval: 5
Neighbor is up for 00:00:02
Authentication Sequence: [ 0 ]
un 20 2022 15:04:53-08:00 R2 %%01OSPF/4/GR_EXIT_HLP_SU(l)[13]:OSPF 256 neighbor
10.1.1.1 exits helper successfully on interface 2.12.1.10.
查看R1与R2的GR状态
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44display ospf 1 graceful-restart
<R1>display ospf 1 graceful-restart
OSPF Process 1 with Router ID 10.1.1.1
Graceful-restart capability : enabled
Graceful-restart support : planned and un-planned, totally
Helper-policy support : planned and un-planned, strict lsa check
Current GR state : normal
Graceful-restart period : 120 seconds
Number of neighbors under helper:
Normal neighbors : 0
Virtual neighbors : 0
Sham-link neighbors : 0
Total neighbors : 0
Number of restarting neighbors : 0
Last exit reason:
On graceful restart : successful exit //restarter成功退出
On Helper : none
<R2>dis ospf 1 graceful-restart
OSPF Process 1 with Router ID 10.2.2.2
Graceful-restart capability : enabled
Graceful-restart support : planned and un-planned, totally
Helper-policy support : planned and un-planned, strict lsa check
Current GR state : normal
Graceful-restart period : 120 seconds
Number of neighbors under helper:
Normal neighbors : 0
Virtual neighbors : 0
Sham-link neighbors : 0
Total neighbors : 0
Number of restarting neighbors : 0
Last exit reason:
On graceful restart : none
On Helper : successful exit // Helper 成功退出
