经历过几回一样的问题,终于发现了cisco和huawei设备之间互连不兼容的问题。php
尤为是两个光端口的速率设置,最保险的作法就是两端都强制速率。html
HUAWEI:oop
undo negotiation auto调试
CISCO:htm
speed nonegotiateblog
偶然在发现网上发现有人写了篇详细的博文,在此引一下。接口
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如下是原文:http://blog.sina.com.cn/s/blog_53b1e5a70100c1j6.htmlci
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中国移动GPRS,把华为GGSN9811和Cisco6509之间的百兆扩为千兆光纤。
Cisco6509:CISCO WS-5484
Huawei GGSN9811:SFP-GE-SX-MM850-A
华为GGSN9811:
interface GigabitEthernet1/0/1
undo negotiation auto
undo shutdown
eth-trunk 3
Cisco 6509:
interface GigabitEthernet6/5
description GGSN4-Gi-1
switchport
switchport access vlan 323
switchport mode access
首先可以确认的是,物理接口正常,多模光纤没有问题。在GGSN侧接口状态正常,指示灯状态正常,Cisco6509侧,状态指示灯没有显示,接口显示Down状态。当拔掉Cisco6509侧光纤时,GGSN侧接口灯灭,说明链路没有问题,问题出如今双方的协商上。
GGSN9811:
[GGSN]disp int gig1/0/1
GigabitEthernet1/0/1 current state: up
Line protocol current state: up
Hardware is WAN-GigabitEthernet,
Card info: 1000BASE-GBIC
Compliance :1000BASE-SX
...................
Negotiation disabled, full-duplex, 1000Mbps
Flow control disabled, urpf disabled
Cisco6509:
Cisco6509#show int g6/5
GigabitEthernet6/5 is up, line protocol is down (notconnect)
Hardware is C6k 1000Mb 802.3, address is 0021.55e3.b49c (bia 0021.55e3.b49c)
Description: GGSN4-Gi-1
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Full-duplex, 1000Mb/s
input flow-control is off, output flow-control is off
………………………
修改Cisco6509侧接口速率配置,问题解决。
interface GigabitEthernet6/5
description GGSN4-Gi-1
speed nonegotiate
switchport
switchport access vlan 323
switchport mode access
当Cisco和Huawei等不一样厂商设备链接时,常常会出现不通、丢包、链路不稳定等问题。基本是由于双方双工模式、速率协商不成功引发,建议强制配置设备间接口的速率、双工模式等。