在使用 Cisco 3850 作为核心交换机时遇到一个奇怪的问题。交换机上的所有端口都充斥着流量。经过进一步调查，似乎 CAM 表没有更新，除了内置地址外，其余都是空的。
使用 Cacti 监控接口，我可以看到每个端口都有大量出站流量，而其他端口上没有相关的入站流量。我设置了一个监控端口，并使用 wireshark 观察了流量，我看到了绝对不应该出现在该端口上的流量。
似乎没有我能识别的任何生成树问题。稍后我将逐个禁用上行链路进行测试。
我仍然很困惑为什么交换机没有填充 mac 地址表，因为有足够的流量，我想它现在应该已经更新了。
Output of 'show mac address-table'
Vlan Mac Address Type Ports
---- ----------- -------- -----
All 0100.0ccc.cccc STATIC CPU
All 0100.0ccc.cccd STATIC CPU
All 0100.0ccc.ccce STATIC CPU
All 0180.c200.0000 STATIC CPU
All 0180.c200.0001 STATIC CPU
All 0180.c200.0002 STATIC CPU
All 0180.c200.0003 STATIC CPU
All 0180.c200.0004 STATIC CPU
All 0180.c200.0005 STATIC CPU
All 0180.c200.0006 STATIC CPU
All 0180.c200.0007 STATIC CPU
All 0180.c200.0008 STATIC CPU
All 0180.c200.0009 STATIC CPU
All 0180.c200.000a STATIC CPU
All 0180.c200.000b STATIC CPU
All 0180.c200.000c STATIC CPU
All 0180.c200.000d STATIC CPU
All 0180.c200.000e STATIC CPU
All 0180.c200.000f STATIC CPU
All 0180.c200.0010 STATIC CPU
All ffff.ffff.ffff STATIC CPU
1 dca5.f433.1bc7 STATIC Vl1
10 dca5.f433.1bc6 STATIC Vl10
30 dca5.f433.1be5 STATIC Vl30
40 dca5.f433.1be4 STATIC Vl40
50 dca5.f433.1be8 STATIC Vl50
20 dca5.f433.1bd6 STATIC Vl20
15 dca5.f433.1bd4 STATIC Vl15
Total Mac Addresses for this criterion: 28
‘show mac address-table count’ 的输出
Mac Entries for Vlan 1:
---------------------------
Dynamic Address Count : 0
Static Address Count : 1
Total Mac Addresses : 1
Mac Entries for Vlan 10:
---------------------------
Dynamic Address Count : 0
Static Address Count : 1
Total Mac Addresses : 1
Mac Entries for Vlan 30:
---------------------------
Dynamic Address Count : 0
Static Address Count : 1
Total Mac Addresses : 1
Mac Entries for Vlan 40:
---------------------------
Dynamic Address Count : 0
Static Address Count : 1
Total Mac Addresses : 1
Mac Entries for Vlan 50:
---------------------------
Dynamic Address Count : 0
Static Address Count : 1
Total Mac Addresses : 1
Mac Entries for Vlan 20:
---------------------------
Dynamic Address Count : 0
Static Address Count : 1
Total Mac Addresses : 1
Mac Entries for Vlan 99:
---------------------------
Dynamic Address Count : 0
Static Address Count : 0
Total Mac Addresses : 0
Mac Entries for Vlan 15:
---------------------------
Dynamic Address Count : 0
Static Address Count : 1
Total Mac Addresses : 1
Total Mac Address Space Available: 32752
输出 sh arp summary
Total number of entries in the ARP table: 424.
Total number of Dynamic ARP entries: 412.
Total number of Incomplete ARP entries: 3.
Total number of Interface ARP entries: 9.
Total number of Static ARP entries: 0.
Total number of Alias ARP entries: 0.
Total number of Simple Application ARP entries: 0.
Total number of Application Alias ARP entries: 0.
Total number of Application Timer ARP entries: 0.
Interface Entry Count
Vlan15 2
GigabitEthernet1/0/24 4
Vlan20 124
LIIN0 1
Vlan40 40
Vlan30 28
Vlan10 222
GigabitEthernet1/0/1 3
太困惑了！有什么想法吗？