相关日志消息
Feb 1 03:39:08.338 EST: %IPV6-4-DUPLICATE: Duplicate address FE80::212:44FF:FE4D:4400 on GigabitEthernet8/20
Feb 1 03:39:08.904 EST: %UDLD-SP-4-UDLD_PORT_DISABLED: UDLD disabled interface Gi8/20, transmit/receive loop detected
Feb 1 03:39:08.904 EST: %PM-SP-4-ERR_DISABLE: udld error detected on Gi8/20, putting Gi8/20 in err-disable state
不太确定要从哪里开始，我觉得在这种情况下重复的地址消息正在说明，但是， sh run |i 什么也没产生，接口本身甚至没有该地址开始.. 真的很想了解更多。
我已经了解 UDLD - 我只是不熟悉那种状态以及之后要看的内容
其他输出：
sh udld gi8/20
Interface Gi8/20
---
Port enable administrative configuration setting: Follows device default
Port enable operational state: Enabled
Current bidirectional state: Transmit-to-receive loop
Current operational state: Disabled port
Message interval: 7
Time out interval: 5
No neighbor cache information stored
interface GigabitEthernet8/20
ip address 43.160.0.229 255.255.255.252
ip flow ingress
ip flow egress
ipv6 address 2607:FD28:AAAA:4::1/64
ipv6 enable
ipv6 ospf network point-to-point
ipv6 ospf 21 area 0
end
GigabitEthernet8/20 is down, line protocol is down (err-disabled)
Hardware is C6k 1000Mb 802.3, address is 0012.444d.4400 (bia 0012.444d.4400)
Internet address is 43.160.0.229/30
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 0/255, rxload 0/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is LH
input flow-control is off, output flow-control is off
Clock mode is auto
ARP type: ARPA, ARP Timeout 04:00:00
Last input 06:10:24, output 06:10:24, output hang never
Last clearing of "show interface" counters 22:09:46
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
L2 Switched: ucast: 0 pkt, 0 bytes - mcast: 3 pkt, 246 bytes
L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes mcast
L3 out Switched: ucast: 0 pkt, 0 bytes mcast: 0 pkt, 0 bytes
4 packets input, 488 bytes, 0 no buffer
Received 4 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
140 packets output, 37264 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out