思科路由器多IP接口ISIS配置全网互通问题求助

阿华AIGC实验室

2026-4-20

各位大佬好，我遇到个ISIS配置的问题想请教下：
我的拓扑是几台Cisco路由器连到交换机，但交换机没法配置Trunk接口。每台路由器的接口上都配了主、副两个IP地址。现在ISIS的情况是，每个路由器只能收到左右邻居的路由——比如从R5 ping R1的环回接口根本不通，但R5上又能看到R1的LSA数据库。想问问有没有办法配置成全网都能互通？谢谢啦！

各路由器ISIS路由表输出

R1的ISIS路由表：

R1#sh ip route isis

12.0.0.0/8 is variably subnetted, 7 subnets, 2 masks

i L2     12.0.10.4/32 [115/20] via 12.10.5.4, 00:26:44, FastEthernet0/0

i L2     12.10.6.0/24 [115/20] via 12.10.5.4, 00:26:44, FastEthernet0/0

R2的ISIS路由表：

R2#sh ip rou isi

12.0.0.0/8 is variably subnetted, 7 subnets, 2 masks

i L2     12.0.10.5/32 [115/20] via 12.10.7.5, 00:18:51, FastEthernet0/0

i L2     12.10.8.0/24 [115/20] via 12.10.7.5, 00:18:51, FastEthernet0/0

R3的ISIS路由表：

R3#sh ip rou isi

12.0.0.0/8 is variably subnetted, 7 subnets, 2 masks

i L2     12.0.10.5/32 [115/20] via 12.10.8.5, 00:19:44, FastEthernet0/0

i L2     12.10.7.0/24 [115/20] via 12.10.8.5, 00:19:44, FastEthernet0/0

R4的ISIS路由表：

R4#sh ip ro isis

12.0.0.0/8 is variably subnetted, 7 subnets, 2 masks

i L2     12.0.10.1/32 [115/20] via 12.10.5.1, 00:29:50, FastEthernet0/0

i L2     12.10.4.0/24 [115/20] via 12.10.5.1, 00:29:57, FastEthernet0/0

R5的ISIS路由表（当前异常状态）：

R5#sh ip rou isis

12.0.0.0/8 is variably subnetted, 9 subnets, 2 masks

i L2     12.0.10.2/32 [115/20] via 12.10.7.2, 00:18:29, FastEthernet0/0

i L2     12.0.10.3/32 [115/20] via 12.10.8.3, 00:18:29, FastEthernet0/0

i L2     12.10.4.0/24 [115/20] via 12.10.8.3, 00:18:29, FastEthernet0/0

i L2     12.10.6.0/24 [115/20] via 12.10.7.2, 00:18:29, FastEthernet0/0

R5的ISIS链路状态数据库信息

R5#sh isis data

IS-IS Level-2 Link State Database:

LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL

R1.00-00              0x00000007   0xDC3C        962               0/0/0

R2.00-00              0x00000006   0x22EE        739               0/0/0

R3.00-00              0x00000006   0x3CD1        739               0/0/0

R3.01-00              0x00000001   0xE116        0 (741)           0/0/0

R4.00-00              0x00000005   0x24E8        873               0/0/0

R4.01-00              0x00000004   0xD9DB        837               0/0/0

R5.00-00            * 0x00000006   0x659D        741               0/0/0

R5.01-00            * 0x00000004   0x0EA3        745               0/0/0

R1的详细LSP信息（来自R5）

R5#sh isis data R1.00-00 detail

IS-IS Level-2 LSP R1.00-00

LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL

R1.00-00              0x00000007   0xDC3C        954               0/0/0

Area Address: 49.0001

NLPID:        0xCC

Hostname: R1

IP Address:   12.0.10.1

Metric: 10         IS-Extended R4.01

Metric: 10         IP 12.0.10.1/32

Metric: 10         IP 12.10.4.0/24

Metric: 10         IP 12.10.5.0/24

补充测试信息

另外我测试过，用Trunk和子接口的相同拓扑是完全正常的，比如R5用子接口时的ISIS路由表和ping测试结果：

R5#sh ip route isis

12.0.0.0/8 is variably subnetted, 12 subnets, 2 masks

i L2     12.0.10.1/32 [115/30] via 12.10.8.3, 00:08:51, FastEthernet0/0.80

i L2     12.0.10.2/32 [115/20] via 12.10.7.2, 00:09:10, FastEthernet0/0.70

i L2     12.0.10.3/32 [115/20] via 12.10.8.3, 00:08:51, FastEthernet0/0.80

i L2     12.0.10.4/32 [115/30] via 12.10.7.2, 00:09:04, FastEthernet0/0.70

i L2     12.10.4.0/24 [115/20] via 12.10.8.3, 00:08:51, FastEthernet0/0.80

i L2     12.10.5.0/24 [115/30] via 12.10.8.3, 00:08:51, FastEthernet0/0.80

[115/30] via 12.10.7.2, 00:08:51, FastEthernet0/0.70

i L2     12.10.6.0/24 [115/20] via 12.10.7.2, 00:09:10, FastEthernet0/0.70

R5#ping 12.0.10.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 12.0.10.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 48/65/80 ms

我感觉问题出在路由器接口上配置多个IP地址，但Cisco的手册里说这种场景是应该能工作的，实在搞不懂哪里错了，求各位帮忙分析下！

备注：内容来源于stack exchange，提问作者vostbur