經歷過幾回一樣的問題,終於發現了cisco和huawei設備之間互連不兼容的問題。php
尤爲是兩個光端口的速率設置,最保險的作法就是兩端都強制速率。html
HUAWEI:oop
undo negotiation auto調試
CISCO:htm
speed nonegotiateblog
偶然在發現網上發現有人寫了篇詳細的博文,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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中國移動GPRS,把華爲GGSN9811和Cisco6509之間的百兆擴爲千兆光纖。
Cisco6509:CISCO WS-5484
Huawei GGSN9811:SFP-GE-SX-MM850-A
華爲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
首先可以確認的是,物理接口正常,多模光纖沒有問題。在GGSN側接口狀態正常,指示燈狀態正常,Cisco6509側,狀態指示燈沒有顯示,接口顯示Down狀態。當拔掉Cisco6509側光纖時,GGSN側接口燈滅,說明鏈路沒有問題,問題出如今雙方的協商上。
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側接口速率配置,問題解決。
interface GigabitEthernet6/5
description GGSN4-Gi-1
speed nonegotiate
switchport
switchport access vlan 323
switchport mode access
當Cisco和Huawei等不一樣廠商設備鏈接時,常常會出現不通、丟包、鏈路不穩定等問題。基本是由於雙方雙工模式、速率協商不成功引發,建議強制配置設備間接口的速率、雙工模式等。