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求教ASR1006出现这些现象是存在环路吗?还是说是传输设备或对端在做环回测试造成的?

xy411381121
Spotlight
Spotlight
最近整理设备端口表时,在cdp邻居里看到了设备自己:
ASR1006_02#show cdp nei
Device ID Local Intrfce Holdtme Capability Platform Port ID
ASR1006_02 Ser 0/0/0.1/2/4/1 135 R I ASR1006 Ser 0/0/0.1/2/4/1:0
ASR1006_02 Ser 0/1/0.1/2/3/2 154 R I ASR1006 Ser 0/1/0.1/2/3/2:0
明明这两个端口连接的对端设备名字是SY与GY,为什么会变成设备自己?
端口配置如下,没有配置loopback口:
interface Serial0/0/0.1/2/4/1:0
description to SY
ip address 172.28.198.37 255.255.255.252
cdp enable
interface Serial0/1/0.1/2/3/2:0
description to GY
ip address 172.28.195.65 255.255.255.252
cdp enable
使用show interface查看端口状态,存在一个looped:
ASR1006_02#show interface
Serial0/0/0.1/2/4/1:0 is up, line protocol is up (looped)
Hardware is SPA-1XCHSTM1/OC3
Description: to SY
Internet address is 172.28.198.37/30
MTU 1500 bytes, BW 2048 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:03, output 00:00:03, output hang never
Last clearing of "show interface" counters 3y3w
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 645
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 6000 bits/sec, 10 packets/sec
5 minute output rate 6000 bits/sec, 10 packets/sec
950855908 packets input, 143010908370 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
1213 input errors, 453 CRC, 314 frame, 0 overrun, 0 ignored, 441 abort
957263308 packets output, 130711745968 bytes, 0 underruns
0 output errors, 0 collisions, 106 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
20 carrier transitions no alarm present
VC 30: timeslot(s): UNFRAMED, Transmitter delay 0, non-inverted data
Serial0/1/0.1/2/3/2:0 is up, line protocol is up (looped)
Hardware is SPA-1XCHSTM1/OC3
Description: to GY
Internet address is 172.28.195.65/30
MTU 1500 bytes, BW 2048 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:08, output 00:00:08, output hang never
Last clearing of "show interface" counters 3y3w
Input queue: 0/375/0/0 (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
811808 packets input, 55575738 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 6 giants, 0 throttles
1861 input errors, 960 CRC, 682 frame, 0 overrun, 0 ignored, 206 abort
10212885 packets output, 281182732 bytes, 0 underruns
0 output errors, 0 collisions, 9 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
8 carrier transitions no alarm present
VC 28: timeslot(s): UNFRAMED, Transmitter delay 0, non-inverted data
请问这是怎么回事啊?是存在环路吗?但使用中一直没有出现问题啊,CPU占用也很低。
本地设备配置上没有loopback口,也没发现有环回测试的配置,请问:
这是对端或传输设备在做环回测试造成的吗?CDP邻居里明明这两个端口连接的对端设备名字是SY与GY,为什么会变成设备自己?
2 条回复2

cruiseluo
Spotlight
Spotlight
如果有" line protocol is up (looped)"那么就是有自环,你能ping通接口的对端地址吗?查看接口的"5 minute input rate"和"5 minute output rate",都很小,其中一个接口都是0。其实你可以做个试验,拿根自环线自环一下,看看结果是否和现在一样。

shimingbu7385
Level 1
Level 1

如果看到loopback,并且cdp邻居也是自己,这就是打环了,不一定是传输设备,也可能在对端路由器上打环之类的。

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