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光纤模块接口全是down状态
cisco3925路由器2个光模块一直处于down状态,查看接口的时候发现是half duplex,外面连接的光纤线都是好的,这个应该是物理层的问题,可是既然光纤线是好的,接口应该up,protocol是down的,经过电信的检测,发现原来是光不匹配,电信出来的是单模,而cisco3925上插的是多模模块,悲剧了,这肯定不匹配了啊。
备注:普通的以太网口只要插上网线,接口应该是up的,但是光纤模块不一样,只有所有的都匹配,比如双工模式,封装等都匹配了才能up,要么都是up,要么都是down,还有一个小技巧来判别是多模还是单..
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在控制面板中选择添加硬件
 

 

 

 
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2012-03-27 15:56:54
ccna实验手册
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2012-03-26 14:33:12
Eigrp负载均衡
 

 
(1)路由器的配置
R1配置:
hostname R1
interface Serial0/0
 ip address 192.168.12.1 255.255.255.0
 serial restart-delay 0
interface FastEthernet1/0
 ip address 192.168.14.1 255.255.255.0
 duplex auto
 speed auto
router eigrp 1
 network 192.168.12.0
 network 192.168.14.0
 no auto-summary
line con 0
 exec-timeout 0 0
 logging synchronous
 
R2配置:
hostname R2
interface Loopback0
 ip address 2.2.2.2 255.255.255.0
!        
interface Serial0/0
 ip address 192.168.12.2 255.255.255.0
 serial restart-delay 0
 clock rate 128000
!        
interface Serial0/1
 ip address 192.168.23.2 255.255.255.0
 serial restart-delay 0
 clock rate 128000
router eigrp 1
 network 2.2.2.0 0.0.0.255
 network 192.168.12.0
 network 192.168.23.0
 no auto-summary
line con 0
 exec-timeout 0 0
 logging synchronous
 
R3配置:
hostname R3
interface Serial0/0
 ip address 192.168.34.3 255.255.255.0
 serial restart-delay 0
 clock rate 128000
!        
interface Serial0/1
 ip address 192.168.23.3 255.255.255.0
 serial restart-delay 0
router eigrp 1
 network 192.168.23.0
 network 192.168.34.0
 no auto-summary
line con 0
 exec-timeout 0 0
 logging synchronous
 
R4配置:
hostname R4
interface Loopback0
 ip address 4.4.4.4 255.255.255.0
!        
interface Serial0/0
 ip address 192.168.34.4 255.255.255.0
 serial restart-delay 0
interface FastEthernet1/0
 ip address 192.168.14.4 255.255.255.0
 delay 10
 duplex auto
 speed auto
!        
router eigrp 1
 network 4.4.4.0 0.0.0.255
 network 192.168.14.0
 network 192.168.34.0
 no auto-summary
line con 0
 exec-timeout 0 0
 logging synchronous
 
 
R4#show ip route
D    192.168.12.0/24 [90/2172416] via 192.168.14.1, 00:11:39, FastEthernet1/0
     2.0.0.0/24 is subnetted, 1 subnets
D       2.2.2.0 [90/2300416] via 192.168.14.1, 00:11:39, FastEthernet1/0
C    192.168.14.0/24 is directly connected, FastEthernet1/0
     4.0.0.0/24 is subnetted, 1 subnets
C       4.4.4.0 is directly connected, Loopback0
D    192.168.23.0/24 [90/2681856] via 192.168.34.3, 00:11:39, Serial0/0
C    192.168.34.0/24 is directly connected, Serial0/0
默认走快速以太网去2.2.2.2
 
R4#show ip eigrp topology
P 2.2.2.0/24, 1 successors, FD is 2300416
        via 192.168.14.1 (2300416/2297856), FastEthernet1/0
        via 192.168.34.3 (2809856/2297856), Serial0/0
P 4.4.4.0/24, 1 successors, FD is 128256
        via Connected, Loopback0
P 192.168.34.0/24, 1 successors, FD is 2169856
        via Connected, Serial0/0
P 192.168.12.0/24, 1 successors, FD is 2172416
        via 192.168.14.1 (2172416/2169856), FastEthernet1/0
P 192.168.14.0/24, 1 successors, FD is 28160
        via Connected, FastEthernet1/0
P 192.168.23.0/24, 1 successors, FD is 2681856
        via 192.168.34.3 (2681856/2169856), Serial0/0
最优FD为2300416,第二条路径的AD为2297856,AD<FD,满足可行性条件,所以第二天路径是最优路由的可行后继。
 
(2)可以通过适当的配置,使得R4上看R2的loopback0的路由条目为等价路由,从而实现等价负载均衡,这2条路径的最小带宽是相同的,只要延时之和相同就是等价路由,在R4上 做如下设置:
R4(config)#interface fastEthernet 1/0
R4(config-if)#delay 2000
备注:在接口下用delay命令修改的延时,在计算度量值时不需要再除以10.
 
R4#show ip route eigrp
D    192.168.12.0/24 [90/2681856] via 192.168.14.1, 00:01:09, FastEthernet1/0
     2.0.0.0/24 is subnetted, 1 subnets
D       2.2.2.0 [90/2809856] via 192.168.34.3, 00:01:09, Serial0/0
              [90/2809856] via 192.168.14.1, 00:01:09, FastEthernet1/0
D    192.168.23.0/24 [90/2681856] via 192.168.34.3, 00:01:09, Serial0/0
可以发现现在这2条路径是等价的。
(3)可以用“variance”命令来实现eigrp的非等价负载均衡
R4(config)#router eigrp 1
R4(config-router)#variance 2
R4#show ip route eigrp
D    192.168.12.0/24 [90/2172416] via 192.168.14.1, 00:03:29, FastEthernet1/0
     2.0.0.0/24 is subnetted, 1 subnets
D       2.2.2.0 [90/2809856] via 192.168.34.3, 00:03:29, Serial0/0
                [90/2300416] via 192.168.14.1, 00:03:29, FastEthernet1/0
D    192.168.23.0/24 [90/2681856] via 192.168.34.3, 00:03:29, Serial0/0
 
Eigrp非等价负载均衡是通过variance命令实现的,variance默认是1,variance值得范围是1-128.
 

 
 
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登陆http://www.citrix.com/ready/hcl
然后转http://hcl.vmd.citrix.com/SLG-HCLHome.aspx
可以查看xenserver的兼容列表,不同的xenserver版本对应的服务器、存储、网卡等,也可以查看服务器支持的xenserver版本。
 

 
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把c:\program files\citrix\licensing\ls\conf\activation_state.xml and concurrent_state.xml on a 32bit server删除或者是重命名,重启下license服务器或者是重启license服务即可。这种情况可能是非法关机引起的,再次开启的时候会留下这2个记录,所以导致服务起不来。
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2012-03-02 15:03:24
目前想好好整理博客,好好学习技术,并且把学到的技术以及过程中遇到的问题分享出来,希望与志同道合的朋友一起沟通交流,一起提高。
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