生成树、端口聚合实验 2010-05-15 10:29:04| 分类： 网络设备 | 标签： |字号大 中
小 订阅 设备：DCS-3950一台，DCRS-5650一台（两台3950也可，不涉及三层功能），PC两台，Console线1-2根，直通线4根
初始准备：将PC1连至3950,3950连5650,5650连PC2，配置IP地址，Ping通
实验过程：
拿出另一根网线，连接3950与5650，数秒后交换机3个接口灯狂闪，原本ping通的变为不通
注：有些交换机默认启用生成树，可以先show spanning-tree查看，是否开启，如果开启，先行关闭。
在3950上输入
DCS-3950-26C(config)#spanning-tree
MSTP is starting now, please wait............. MSTP is enabled successfully. DCS-3950-26C(config)#
可以看到，端口不再狂闪，数秒后网络恢复正常，再等待数秒后，再次狂闪，网络再次瘫痪
DCS-3950-26C#show spanning-tree
-- MSTP Bridge Config Info --
Standard : IEEE 802.1s
Bridge MAC : 00:03:0f:13:56:3b
Bridge Times : Max Age 20, Hello Time 2, Forward Delay 15 Force Version: 3
########################### Instance 0 ########################### Self Bridge Id : 32768 - 00:03:0f:13:56:3b Root Id : this switch Ext.RootPathCost : 0
Region Root Id : this switch Int.RootPathCost : 0 Root Port ID : 0
Current port list in Instance 0:
Ethernet0/0/1 Ethernet0/0/6 Ethernet0/0/17 (Total 3)
PortName ID ExtRPC IntRPC State Role DsgBridge DsgPort
-------------- -------- --------- --------- --- ---- ------------------ -------
Ethernet0/0/1 128.001 0 0 FWD DSGN 32768.00030f13563b 128.001 Ethernet0/0/6 128.006 0 0 FWD DSGN 32768.00030f13563b 128.006 Ethernet0/0/17 128.017 0 0 FWD DSGN 32768.00030f13563b 128.017
在5650上也开启spanning-tree，再次查看3950 DCS-3950-26C#show span
-- MSTP Bridge Config Info --
Standard : IEEE 802.1s
Bridge MAC : 00:03:0f:13:56:3b
Bridge Times : Max Age 20, Hello Time 2, Forward Delay 15 Force Version: 3
########################### Instance 0 ########################### Self Bridge Id : 32768 - 00:03:0f:13:56:3b Root Id : this switch Ext.RootPathCost : 0
Region Root Id : this switch Int.RootPathCost : 0 Root Port ID : 0
Current port list in Instance 0:
Ethernet0/0/1 Ethernet0/0/6 Ethernet0/0/17 (Total 3)
PortName ID ExtRPC IntRPC State Role DsgBridge DsgPort -------------- -------- --------- --------- --- ---- ------------------ -------
Ethernet0/0/1 128.001 0 0 FWD DSGN 32768.00030f13563b 128.001 Ethernet0/0/6 128.006 0 0 FWD DSGN 32768.00030f13563b 128.006 Ethernet0/0/17 128.017 0 0 FWD DSGN 32768.00030f13563b 128.017
在5650上show span 查看结果
DCRS-5650-28#show span
-- MSTP Bridge Config Info --
Standard : IEEE 802.1s
Bridge MAC : 00:03:0f:13:61:6b
Bridge Times : Max Age 20, Hello Time 2, Forward Delay 15 Force Version: 3
########################### Instance 0 ########################### Self Bridge Id : 32768 - 00:03:0f:13:61:6b Root Id : 32768.00:03:0f:13:56:3b Ext.RootPathCost : 200000 Region Root Id : this switch Int.RootPathCost : 0
Root Port ID : 128.15
Current port list in Instance 0:
Ethernet0/0/3 Ethernet0/0/10 Ethernet0/0/15 (Total 3)
PortName ID ExtRPC IntRPC State Role DsgBridge DsgPort -------------- ------- --------- --------- --- ---- ------------------ -------
Ethernet0/0/3 128.003 200000 0 FWD DSGN 32768.00030f13616b 128.003 Ethernet0/0/10 128.010 0 0 BLK ALTR 32768.00030f13563b 128.006 Ethernet0/0/15 128.015 0 0 FWD ROOT 32768.00030f13563b 128.001 DCRS-5650-28#
可见在5650上，第10个端口变成了阻塞状态
查看ping，网络恢复互通，交换机灯不再狂闪
生成树运行成功
*********************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
端口聚合
端口聚合可以使两个或者多个端口逻辑上当作一个端口来使用，与生成树不同的是，生成树
是逻辑上阻塞一个或多个端口的工作，保持只有一个端口工作，交换机间的带宽不变；而端口聚合是将多个物理端口逻辑看作一个端口来使用，带宽变为 n*端口带宽。
关闭span，不久网络不通，在3950上开启port-group DCS-3950-26C(config)#port-group 1
DCS-3950-26C(config)#int e0/0/1
DCS-3950-26C(config-if-ethernet0/0/1)#port-group 1 mode on DCS-3950-26C(config-if-ethernet0/0/1)#int e0/0/5
DCS-3950-26C(config-if-ethernet0/0/5)#port-group 1 mode on
接下来，在5650上开启port-group
DCRS-5650-28(config)#port-group 1 DCRS-5650-28(config)#int e0/0/10
DCRS-5650-28(Config-If-Ethernet0/0/10)#port-group 1 mode on DCRS-5650-28(Config-If-Ethernet0/0/10)#int e0/0/15 DCRS-5650-28(Config-If-Ethernet0/0/15)#port
DCRS-5650-28(Config-If-Ethernet0/0/15)#port-group 1 mo on
the port Ethernet0/0/15 successfully added to the group1 as on mode
DCRS-5650-28(Config-If-Ethernet0/0/15)#%Jan 01 00:34:48 2006 %LINK-3-UPDOWN: Interface Port-Channel1, changed state to administratively DOWN
%Jan 01 00:34:48 2006 %LINK-5-CHANGED: Interface Port-Channel1, changed state to UP
%Jan 01 00:34:48 2006 %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-Channel1, changed state to DOWN
%Jan 01 00:34:48 2006 create the trunk group Port-Channel1 successfully.
%Jan 01 00:34:49 2006 %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-Channel1, changed state to UP
%Jan 01 00:34:49 2006 %DUPLEX-7-CHANGE: Interface Port-Channel1, DUPLEX changed state to FULL
%Jan 01 00:34:49 2006 %SPEED-8-CHANGE: Interface Port-Channel1, SPEED changed state to 100M
DCRS-5650-28(Config-If-Ethernet0/0/15)# DCRS-5650-28#show port-g b Port-group number : 1
the attributes of the port-group are as follows:
Number of ports in port-group : 2 Maxports in port-channel = 8 Number of port-channels : 1 Max port-channels : 1
DCRS-5650-28#show vlan
VLAN Name Type Media Ports
---- ------------ ---------- --------- ----------------------------------------
1 default Static ENET Ethernet0/0/1 Ethernet0/0/2 Ethernet0/0/3 Ethernet0/0/4 Ethernet0/0/5 Ethernet0/0/6 Ethernet0/0/7 Ethernet0/0/8 Ethernet0/0/9 Ethernet0/0/11 Ethernet0/0/12 Ethernet0/0/13 Ethernet0/0/14 Ethernet0/0/16 Ethernet0/0/17 Ethernet0/0/18 Ethernet0/0/19 Ethernet0/0/20 Ethernet0/0/21 Ethernet0/0/22 Ethernet0/0/23 Ethernet0/0/24 Ethernet0/0/25 Ethernet0/0/26 Ethernet0/0/27 Ethernet0/0/28 Port-Channel1 DCRS-5650-28#
此处的端口聚合模式为on，即手动执行，也可以使用LACP协议自动协商
即，在一台交换机上，设置为 port-group 1 mode active(将on改为active)
另一台交换机上，设置为 port-group 1 mode passive(将on改为passive)
基于IEEE802.3ad标准的LACP（Link Aggregation Control Protocol，链路汇聚控制协议）是一种实现链路动态汇聚的协议。LACP协议通过LACPDU（Link Aggregation Control Protocol Data Unit，链路汇聚控制协议数据单元）与对端交互信息。
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