为什么在同一个 VLAN 中显示重复的 mac 地址？

网络工程 VLAN
2021-07-17 11:11:31 
 6509 Server-VSS Switch Rack GG 10.36.x.x

我检查了show mac-address-table interface port-channel 133 显示重复的 mac 地址：

* 2301  0050.5617.07a0   dynamic  Yes        175   Po133
* 2301  0050.5617.07a0   dynamic  Yes         45   Po133
* 2301  0050.5617.07a2   dynamic  Yes         40   Po133
* 2301  0050.5617.07a2   dynamic  Yes        215   Po133
* 2301  0050.5617.1000   dynamic  Yes         10   Po133
* 2301  0050.5617.1000   dynamic  Yes        130   Po133
* 2301  0050.5617.1002   dynamic  Yes         10   Po133
* 2301  0050.5617.1002   dynamic  Yes        130   Po133
* 2301  0050.5617.1540   dynamic  Yes         50   Po133
* 2301  0050.5617.1540   dynamic  Yes        130   Po133
* 2301  0050.5617.1542   dynamic  Yes         50   Po133
* 2301  0050.5617.1542   dynamic  Yes         75   Po133
* 2301  0050.5617.1cc0   dynamic  Yes         10   Po133
* 2301  0050.5617.1cc0   dynamic  Yes        210   Po133
* 2301  0050.5617.1cc2   dynamic  Yes          5   Po133
* 2301  0050.5617.1cc2   dynamic  Yes        215   Po133
* 2301  0050.5617.2660   dynamic  Yes         55   Po133
* 2301  0050.5617.2660   dynamic  Yes         75   Po133
* 2301  0050.5617.2662   dynamic  Yes         55   Po133
* 2301  0050.5617.2662   dynamic  Yes         75   Po133
* 2301  0050.5617.2820   dynamic  Yes          5   Po133
* 2301  0050.5617.2820   dynamic  Yes        130   Po133
* 2301  0050.5617.2822   dynamic  Yes          5   Po133
* 2301  0050.5617.2822   dynamic  Yes        130   Po133
* 2301  0050.5617.37e0   dynamic  Yes         45   Po133
* 2301  0050.5617.37e0   dynamic  Yes        210   Po133
* 2301  0050.5617.37e2   dynamic  Yes         45   Po133
* 2301  0050.5617.37e2   dynamic  Yes        185   Po133
* 2301  0050.5617.3cc0   dynamic  Yes         40   Po133
* 2301  0050.5617.3cc0   dynamic  Yes        130   Po133
* 2301  0050.5617.3cc2   dynamic  Yes         40   Po133
* 2301  0050.5617.3cc2   dynamic  Yes         75   Po133
* 2301  0050.5617.3f40   dynamic  Yes         50   Po133
* 2301  0050.5617.3f40   dynamic  Yes         75   Po133
* 2301  0050.5617.4320   dynamic  Yes         25   Po133
* 2301  0050.5617.4320   dynamic  Yes        130   Po133
* 2301  0050.5617.4322   dynamic  Yes         45   Po133
* 2301  0050.5617.4322   dynamic  Yes         75   Po133
* 2301  0050.5617.43a0   dynamic  Yes         25   Po133
* 2301  0050.5617.43a0   dynamic  Yes        130   Po133
* 2301  0050.5617.43a2   dynamic  Yes         20   Po133
* 2301  0050.5617.43a2   dynamic  Yes         75   Po133
* 2301  0050.5617.44e0   dynamic  Yes         30   Po133
* 2301  0050.5617.44e0   dynamic  Yes        215   Po133
* 2301  0050.5617.44e2   dynamic  Yes         25   Po133
* 2301  0050.5617.44e2   dynamic  Yes        215   Po133
* 2301  0050.5617.4780   dynamic  Yes         55   Po133
* 2301  0050.5617.4780   dynamic  Yes        215   Po133
* 2301  0050.5617.4782   dynamic  Yes         55   Po133
* 2301  0050.5617.4782   dynamic  Yes        210   Po133
* 2301  0050.5617.4ca0   dynamic  Yes         55   Po133
* 2301  0050.5617.4ca0   dynamic  Yes        130   Po133
* 2301  0050.5617.4ca2   dynamic  Yes         55   Po133
* 2301  0050.5617.4ca2   dynamic  Yes        130   Po133
* 2301  0050.5617.51e0   dynamic  Yes         35   Po133
* 2301  0050.5617.51e0   dynamic  Yes         75   Po133
* 2301  0050.5617.51e2   dynamic  Yes         35   Po133
* 2301  0050.5617.51e2   dynamic  Yes         75   Po133
* 2301  0050.5617.5260   dynamic  Yes          0   Po133
* 2301  0050.5617.5260   dynamic  Yes        130   Po133
* 2301  0050.5617.5262   dynamic  Yes          0   Po133
* 2301  0050.5617.5262   dynamic  Yes        130   Po133
* 2301  0050.5617.5880   dynamic  Yes         15   Po133
* 2301  0050.5617.5880   dynamic  Yes        215   Po133
* 2301  0050.5617.5882   dynamic  Yes         20   Po133
* 2301  0050.5617.5882   dynamic  Yes        180   Po133
* 2301  0050.5617.5a60   dynamic  Yes         20   Po133
* 2301  0050.5617.5a60   dynamic  Yes        130   Po133
* 2301  0050.5617.5a62   dynamic  Yes         20   Po133
* 2301  0050.5617.5a62   dynamic  Yes        130   Po133
r-tx-server-1#show interfaces status | inc 2301
Gi1/2/11     *** MediaSite Vide notconnect   2301         full   auto 10/100/1000BaseT
Gi1/3/9      *** Culinary Video notconnect   2301         full   auto 10/100/1000BaseT
Gi1/3/28     *** Culinary Video notconnect   2301         full   auto 10/100/1000BaseT
Gi1/4/1      *** MEDIALX - E291 notconnect   2301         full   auto 10/100/1000BaseT
Gi1/4/3      *** FACULTYWEB - E notconnect   2301         full   auto 10/100/1000BaseT
Gi1/4/17     ***FACULTYWEB - S3 notconnect   2301         full   auto 10/100/1000BaseT
Gi2/2/13     ** EMSDVCS1  **    connected    2301       a-full a-1000 10/100/1000BaseT
Gi2/2/14     ** EMSDVCS2  **    connected    2301       a-full a-1000 10/100/1000BaseT
Gi2/2/15     ** EMSDVCS3  **    connected    2301       a-full a-1000 10/100/1000BaseT
Gi2/2/16     ** EMSIISSQL **    connected    2301       a-full a-1000 10/100/1000BaseT
Gi2/2/17     ** EMSDVCS4  **    connected    2301       a-full a-1000 10/100/1000BaseT
Gi2/2/18     ** EMSDVCS5  **    connected    2301       a-full a-1000 10/100/1000BaseT
Gi2/2/21     *** ICHAIN ***     notconnect   2301         auto   auto 10/100/1000BaseT
r-tx-server-1#show arp | inc Incomplete
Internet  10.21.1.21              0   Incomplete      ARPA
Internet  10.23.1.58              0   Incomplete      ARPA
Internet  10.20.254.200           0   Incomplete      ARPA
Internet  10.23.1.54              0   Incomplete      ARPA
Internet  10.20.254.202           0   Incomplete      ARPA
Internet  10.33.3.21              0   Incomplete      ARPA
Internet  10.34.1.20              0   Incomplete      ARPA
Internet  10.41.0.29              0   Incomplete      ARPA
Internet  198.150.241.240         0   Incomplete      ARPA
Internet  10.35.1.116             0   Incomplete      ARPA
Internet  10.39.0.115             0   Incomplete      ARPA
Internet  10.23.100.11            0   Incomplete      ARPA
Internet  10.199.0.12             0   Incomplete      ARPA
Internet  10.39.0.202             0   Incomplete      ARPA
Internet  10.199.0.53             0   Incomplete      ARPA
Internet  10.20.251.30            0   Incomplete      ARPA

我的问题是为什么 IP 地址不完整？

1个回答

我的问题是为什么 IP 地址不完整？

当有问题的设备（在本例中是您的交换机）无法从主机获得 ARP 响应时，ARP 条目被标记为不完整。

这通常意味着主机 IP 不存在，或者您正在主机（通常很难做到）或交换机上过滤 ARP 响应（例如：使用 VLAN 访问映射并阻止 ARP 以太网类型）。

如果您的交换机是 L3（例如：它路由到这些子网中的每一个），那么可能是您网络中其他地方的设备正在尝试访问它们，并且虽然交换机本地连接了子网，但它无法解析 ARP并计算出目标 MAC。

为什么在同一个 VLAN 中显示重复的 mac 地址？

我可能是错的，但我认为 VLAN ID 位于输出的倒数第二列，在这种情况下，您有一堆不同的 VLAN 都在中继上，Po133而您只是在多个 VLAN 中看到相同的 MAC（这是完全合法的） .

请记住，ARP 表和 MAC 地址表是两种截然不同的东西 - 一种与路由 (L3) 相关，一种与交换 (L2) 相关。

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