某局点,使用SR88替换老的路由器与老NE40进行对接155POS,在替换老路由器之后,发现POS接口一直处于物理UP,协议down的状态。由于替换的时候,直接采用拷贝的原有配置,配置上再三对过无异常,此时接口依旧处于物理UP、协议down。
而且现场测试,将同一个线缆插到老设备上,接口立即物理协议双UP。
通过查看接口信息,可以看到配置上并无异常:
新设备:
[NEW]display cu interface Pos3/2/1/2/1:0
#
interface Pos3/2/1/2/1:0
description TO-ANHUI-RT01-MSR50
flag j1 sdh NetEngine
link-protocol ppp
ip address 10.200.1.45 255.255.255.252
ospf authentication-mode simple cipher $c$3$oSoiIAY4zbbWJYGJ9g2fS+5Wjk5sYQ==
#
旧设备:
#
interface Pos3/2/1/2/1:0
description TO-ANHUI-RT01-MSR50
flag j1 sdh NetEngine
link-protocol ppp
ip address 10.200.1.45 255.255.255.252
ospf authentication-mode simple plain h3c
查看接口状态,可以看到:
新设备:
[NEW]display interface Pos3/2/1/2/1:0
Pos3/2/1/2/1:0 current state: UP
Line protocol current state: DOWN
Description: TO-ANHUI-RT01-MSR50
The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Link delay is 1000(msec)
Internet Address is 10.200.1.45/30 Primary
Link layer protocol is PPP
LCP reqsent
Physical layer is OC-3c:
C2(TX): 0x16 C2(RX): 0x16
J1(TX): "NetEngine"
J1(RX): "NetEngine "
Alarm: TIM-P
Error: 0 BIP(B3), 202 REI(G1), 0 PJE, 0 NJE
CRC type is 32-bit
SPE Scrambling enable
Last 300 seconds input: 0 Packets/sec, 0 Bytes/sec
Last 300 seconds output: 0 Packets/sec, 0 Bytes/sec
Input: 0 Packets, 0 Bytes
0 Aborts, 0 FCS errors, 0 FIFO overflow
0 Giants, 0 Runts
Output: 159 Packets, 2862 Bytes
0 Aborts, 0 FIFO overflow
Peak value of input: 0 bytes/sec, at 2015-11-01 05:27:32
Peak value of output: 3 bytes/sec, at 2015-11-01 05:22:32
老设备:
Pos3/2/1/2/1:0 current state: UP
Line protocol current state: UP
Description: TO-ANHUI-RT01-MSR50
The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Link delay is 1000(msec)
Internet Address is 10.200.1.45/30 Primary
Link layer protocol is PPP
LCP opened, IPCP opened
Physical layer is OC-3c:
C2(TX): 0x16 C2(RX): 0x16
J1(TX): "NetEngine "
J1(RX): "NetEngine "
Alarm: none
Error: 0 BIP(B3), 0 REI(G1), 0 PJE, 0 NJE
CRC type is 32-bit
SPE Scrambling enable
Last 300 seconds input: 0 Packets/sec, 0 Bytes/sec
Last 300 seconds output: 0 Packets/sec, 0 Bytes/sec
Input: 13167 Packets, 14574737 Bytes
0 Aborts, 0 FCS errors, 0 FIFO overflow
0 Giants, 0 Runts
Output: 15 Packets, 738 Bytes
0 Aborts, 0 FIFO overflow
Peak value of input: 0 bytes/sec, at 2015-10-31 21:38:18
Peak value of output: 0 bytes/sec, at 2015-10-31 21:38:18
由于此版本中并无已知的软件bug,所以更倾向于认为是配置问题。
仔细对比配置,发现,新旧设备的J1有所不同,具体如下:
可以看到在新设备中
J1(TX): "NetEngine"
J1(RX): "NetEngine "
TX出方向,NetEngine后面没有空格,RX入方向NetEngine没有有空格。
对于老设备
J1(TX): "NetEngine "
J1(RX): "NetEngine "
出入方向一致,NetEngine后面均存在有空格。
所以此处判断是新设备的J1收发不一致导致。
在新设备的flag j1 sdh NetEngine后面敲上6个空格,使之收发一致,再做测试,物理协议正常UP,ping测试网络通畅。
遇到此类问题,还需要细心察看下,对于一些比较成熟的技术,通常问题还是跟配置有关。
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