在AIX 5L上使用绑定网卡（etherchannel)
在AIX操作系统中，用户可以配置多个EtherChannel（网卡绑定）。在AIX 5.2之前，我们要么只能选择active/active EtherChannel模式，要么，只能选择active/standby EtherChannel模式的绑定网卡。所以，AIX 5.2中引入了新的网卡后备模式，用户可以为整个EtherChannel指定一块备份网卡，当整个EtherChannel失效时，这块网卡会自动顶替EtherChannel的功能。这与AIX 5.2之前的EtherChannel网卡备份模式有很大区别，因此，在5.2以后可以出现更为复杂的复合网卡绑定模式。
一个EtherChannel中可以有2到8块网卡，一个AIX操作系统中可以配置多个EtherChannel。但要记住每个EtherChannel都是一个新的以太网接口，用户也许需要通过no命令调整ifsize参数的值来保证以太网卡和EtherChannel的总数不超过ifsize，ifsize的默认值是8。
您可以使用任何AIX系统支持的网卡来组建EtherChannel。但EtherChannel的同一个通道成员网卡必须连接到支持EtherChannel的交换机上，备用通道可以接入到另外一个交换机，用于主通道的失败接管。EtherChannel的所有成员网卡都应该设置成同样的速度和工作模式，如1000兆全双工。要用作EtherChannel成员的网卡不能配置IP地址，如果已经配置了，必须要在开始配置EtherChannel前删除这些配置。
在Aix5.2以后，我们看看三种典型的配置方式
1、双通道或者多通道的共同active模式，这个模式下，所有的网卡都处于active状态，也就是每个网卡都处于工作状态，他们共有一个IP地址与MAC地址，但是，所有网卡的目标必须在同一个交换机上，并且交换机的对应端口也要绑定。
这样做最大的好处就是，当其中一个网卡失效，或者一根网线失效的时候，不影响整个网络的工作，只有当所有的网卡通道失效的时候，网络才失效。而且，多个网卡的同时工作，可以增加网络带宽，不过，要注意，默认的分配方式是根据目标机器的Ip来分配使用哪个网卡，如果目标机器只有一台，不适合使用默认设置。这种模式下，最大的问题就是所有的网卡目标必须在同一个交换机上，并且绑定在一起，不能防止目标交换机故障。
2、active/standby模式，这样的模式下，一个网卡接到主交换机，一个网卡接到备用交换机，当active通道失效的时候，自动切换到standby通道，当主通道恢复正常的时候，再自动切换到主通道（这里是否切换回去，是可以配置的）。这种方式最大的好处就是可以防止交换机的故障。
3、复合式配置，在这种配置中，结合以上2种方式的优点。如一个3块网卡的环境中，我们可以把其中2片网卡配置成双active模式，以增加网络带宽以及网络的可靠性，另外一块网卡作为后备模式，接在另外一个交换机上，当前面2个网卡都失效，或者前面2个网卡接的交换机失效的时候，切换到后备网卡上。如图：
下面，我们介绍一下详细的步骤：
如果想绑定或者取消绑定，可以用smit etherchannel完成，如要绑定ent1与ent2则：。
#chdev -l en1 -a netaddr=” -a netmask=”
#chdev -l en2 -a netaddr=” -a netmask=”
#chdev -l en1 -a state=’detach’
#chdev -l en2 -a state=’detach’
注意：以上命令是必要的，子网卡先取消现有的IP地址，以及一定要处于detach状态，注意，如果通过en1或者en2连接到主机，操作以上的命令，你的网络可能马上就被中断了，所以，以上的操作建议通过其它网卡完成，或者在HMC上完成。然后，我们开始绑定
#smit etherchannel
选择
Add An EtherChannel / Link Aggregation
在这里选择网卡
EtherChannel / Link Aggregation Adapters ent1,ent2
回车执行：
Command: OK stdout: yes stderr: no
Before command completion, additional instructions may appear below.
ent4 Available
最后会提示新的网卡的生成，这个网卡就是可用的绑定过之后的网卡。可用lsattr查看其属性或者是lsdev -Cc adapter看所有网卡属性。
#lsattr -El ent4
adapter_names ent1,ent2 EtherChannel Adapters True
alt_addr 0x000000000000 Alternate EtherChannel Address True
auto_recovery yes Enable automatic recovery after failover True
backup_adapter NONE Adapter used when whole channel fails True
hash_mode default Determines how outgoing adapter is chosen True
mode standard EtherChannel mode of operation True
netaddr Address to ping True
num_retries 3 Times to retry ping before failing True
retry_time 1 Wait time (in seconds) between pings True
use_alt_addr no Enable Alternate EtherChannel Address True
use_jumbo_frame no Enable Gigabit Ethernet Jumbo Frames True
这样绑定的网卡是双通路的，就是说两个网卡都是处于活动状态，注意，这里还需要交换机配合才可以最终接通2块网卡，网络交换机的设置，可以联系你们的系统管理员。
我们也可以设置备用网卡，平常并不活动，处于备用接管状态，如果主通道发生问题，则切换到备用通道，这样的话，则可以接到两个不同的交换机上用于交换机冗余。
备用网卡就是上面的backup_adapter，可以通过
#smit chgethch
或者是
#smit etherchannel
选择
Change / Show Characteristics of an EtherChannel / Link Aggregation
再选择
Add Backup Adapter来完成。增加过后备网卡的绑定网卡，对比以上，将有如下的差别：
#lsattr -El ent4
adapter_names ent1,ent2 EtherChannel Adapters True
alt_addr 0x000000000000 Alternate EtherChannel Address True
auto_recovery yes Enable automatic recovery after failover True
backup_adapter ent3 Adapter used when whole channel fails True
hash_mode default Determines how outgoing adapter is chosen True
mode standard EtherChannel mode of operation True
netaddr Address to ping True
num_retries 3 Times to retry ping before failing True
retry_time 1 Wait time (in seconds) between pings True
use_alt_addr no Enable Alternate EtherChannel Address True
use_jumbo_frame no Enable Gigabit Ethernet Jumbo Frames True
至于网卡的工作状态，还可以通过netstat -v来查看，如：
#netstat -v ent4
ETHERNET STATISTICS (ent4) :
Device Type: EtherChannel
Hardware Address: 00:14:5e:b7:26:88
......
Number of adapters: 3
Active channel: primary channel
Operating mode: Standard mode
Hash mode: Destination IP address
......
ETHERNET STATISTICS (ent1) :
Link Status : Up
Media Speed Selected: Auto negotiation
Media Speed Running: 1000 Mbps Full Duplex
......
ETHERNET STATISTICS (ent2) :
Link Status : Up
Media Speed Selected: Auto negotiation
Media Speed Running: 1000 Mbps Full Duplex
......
Backup adapter - ent3:
======================
Link Status : Up
Media Speed Selected: Auto negotiation
Media Speed Running: 1000 Mbps Full Duplex
如果想取消绑定，则同样执行
#smit etherchannel
选择
Remove An EtherChannel / Link Aggregation
选择你需要取消的网卡，如上面的ent4，回车执行
Command: OK stdout: yes stderr: no
Before command completion, additional instructions may appear below.
ent4 deleted
如果得到以上的结果，表示绑定取消成功。成功的结果，可以通过lsdev -Cc adapter前后对比获得。
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实际操作后验证
# errpt -dH
IDENTIFIER TIMESTAMP T C RESOURCE_NAME DESCRIPTION
F3931284 1229151609 I H ent4 ETHERNET NETWORK RECOVERY MODE
8650BE3F 1229151609 I H ent6 ETHERCHANNEL RECOVERY
F3931284 1229151609 I H ent0 ETHERNET NETWORK RECOVERY MODE
AA8D7232 1229151009 I H ent6 TOTAL ETHERCHANNEL FAILURE
EC0BCCD4 1229151009 T H ent4 ETHERNET DOWN
F3846E13 1229150909 P H ent6 EC0BCCD4 1229150909 T H ent0 8650BE3F 1229150009 I H ent6 F3931284 1229145909 I H ent0 MODE
F3846E13 1229145909 P H ent6 EC0BCCD4 1229145909 T H ent0 AA8D7232 1229143009 I H ent6 EC0BCCD4 1229143009 T H ent4 F3846E13 1229143009 P H ent6 ETHERCHANNEL FAILOVER
ETHERNET DOWN
ETHERNET NETWORK RECOVERY ETHERCHANNEL FAILOVER
ETHERNET DOWN
TOTAL ETHERCHANNEL FAILURE
ETHERNET DOWN
ETHERCHANNEL FAILOVER
ETHERCHANNEL RECOVERY
EC0BCCD4 1229143009 T H ent0 ETHERNET DOWN
ent6是聚合端口，ent0和ent4是什么呢，查下他们的属性
# ifconfig -a
en1:
flags=5e080863,c0 inet 10.1.1.2 netmask 0xffffff00 broadcast 10.1.1.255 tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0 en6: flags=5e080863,c0 inet 192.168.168.102 netmask 0xffffff00 broadcast 192.168.168.255 inet 192.168.200.2 netmask 0xffffff00 broadcast 192.168.200.255 tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0 lo0: flags=e08084b inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255 inet6 ::1/0 # lsattr -El ent6 adapter_names ent0 EtherChannel Adapters True alt_addr 0x000000000000 Alternate EtherChannel Address True auto_recovery yes Enable automatic recovery after failover True backup_adapter ent4 Adapter used when whole channel fails True hash_mode chosen True default Determines how outgoing adapter is mode standard EtherChannel mode of operation True netaddr 0 Address to ping True noloss_failover yes Enable lossless failover after ping failure True num_retries 3 Times to retry ping before failing True retry_time 1 Wait time (in seconds) between pings True use_alt_addr no Enable Alternate EtherChannel Address True use_jumbo_frame no Enable Gigabit Ethernet Jumbo Frames True 可见ent0 ent6聚合端口的主口，ent4是辅口，如果ent0挂了，网络ip 会接管到ent4上去。 用如下命令可以查看详细信息（关键信息为红字) # netstat -v ent6 ------------------------------------------------------------- ETHERNET STATISTICS (ent6) : Device Type: EtherChannel Hardware Address: 00:14:5e:c8:20:d4 Elapsed Time: 0 days 19 hours 17 minutes 21 seconds Transmit Statistics: Receive Statistics: -------------------- ------------------- Packets: 573353 Packets: 763977 Bytes: 82887809 Bytes: 152026709 Interrupts: 0 Interrupts: 726784 Transmit Errors: 0 Receive Errors: 0 Packets Dropped: 0 Packets Dropped: 0 Bad Packets: 0 Max Packets on S/W Transmit Queue: 16 S/W Transmit Queue Overflow: 0 Current S/W+H/W Transmit Queue Length: 1 Elapsed Time: 0 days 0 hours 0 minutes 0 seconds Broadcast Packets: 470 Broadcast Packets: 181229 Multicast Packets: 1 Multicast Packets: 0 No Carrier Sense: 0 CRC Errors: 0 DMA Underrun: 0 DMA Overrun: 0 Lost CTS Errors: 0 Alignment Errors: 0 Max Collision Errors: 0 No Resource Errors: 0 Late Collision Errors: 0 Receive Collision Errors: 0 Deferred: 0 Packet Too Short Errors: 0 SQE Test: 0 Packet Too Long Errors: 0 Timeout Errors: 0 Packets Discarded by Adapter: 0 Single Collision Count: 0 Receiver Start Count: 0 Multiple Collision Count: 0 Current HW Transmit Queue Length: 1 General Statistics: ------------------- No mbuf Errors: 0 Adapter Reset Count: 2 Adapter Data Rate: 2000 Driver Flags: Up Broadcast Running Simplex BitSupport ChecksumOffload PrivateSegment LargeSend DataRateSet ============================================================= ============================================================= Statistics for every adapter in the EtherChannel: ------------------------------------------------- Number of adapters: 2 Active channel: primary channel Operating mode: Network interface backup mode ------------------------------------------------------------- ETHERNET STATISTICS (ent0) : Device Type: 2-Port 10/100/1000 Base-TX PCI-X Adapter (141002) Hardware Address: 00:14:5e:c8:20:d4 Transmit Statistics: Receive Statistics: -------------------- ------------------- Packets: 572652 Packets: 672530 Bytes: 82820781 Bytes: 135221262 Interrupts: 0 Interrupts: 2577 Transmit Errors: 0 Receive Errors: 0 Packets Dropped: 0 Packets Dropped: 0 Bad Packets: 0 Max Packets on S/W Transmit Queue: 13 S/W Transmit Queue Overflow: 0 Current S/W+H/W Transmit Queue Length: 2 Broadcast Packets: 450 Broadcast Packets: 90472 Multicast Packets: 1 No Carrier Sense: 0 DMA Underrun: 0 Lost CTS Errors: 0 Max Collision Errors: 0 Late Collision Errors: 0 Deferred: 0 SQE Test: 0 Timeout Errors: 0 Single Collision Count: 0 Multicast Packets: 0 CRC Errors: 0 DMA Overrun: 0 Alignment Errors: 0 No Resource Errors: 0 Receive Collision Errors: 0 Packet Too Short Errors: 0 Packet Too Long Errors: 0 Packets Discarded by Adapter: 0 Receiver Start Count: 0 Multiple Collision Count: 0 Current HW Transmit Queue Length: 2 General Statistics: ------------------- No mbuf Errors: 0 Adapter Reset Count: 1 Adapter Data Rate: 2000 Driver Flags: Up Broadcast Running Simplex BitSupport ChecksumOffload PrivateSegment LargeSend DataRateSet 2-Port 10/100/1000 Base-TX PCI-X Adapter (141002) Specific Statistics: ------------------------------------------------------------------------ Link Status : Up Media Speed Selected: Auto negotiation Media Speed Running: 1000 Mbps Full Duplex PCI Mode: PCI-X (100-133) PCI Bus Width: -bit Latency Timer: 144 Cache Line Size: 128 Jumbo Frames: Disabled TCP Segmentation Offload: Enabled TCP Segmentation Offload Packets Transmitted: 2434 TCP Segmentation Offload Packet Errors: 0 Transmit and Receive Flow Control Status: Enabled XON Flow Control Packets Transmitted: 0 XON Flow Control Packets Received: 0 XOFF Flow Control Packets Transmitted: 0 XOFF Flow Control Packets Received: 0 Transmit and Receive Flow Control Threshold (High): 45056 Transmit and Receive Flow Control Threshold (Low): 24576 Transmit and Receive Storage Allocation (TX/RX): 16/48 ------------------------------------------------------------- Backup adapter - ent4: ====================== ETHERNET STATISTICS (ent4) : Device Type: 2-Port 10/100/1000 Base-TX PCI-X Adapter (141002) Hardware Address: 00:14:5e:c8:20:d4 Transmit Statistics: Receive Statistics: -------------------- ------------------- Packets: 702 Packets: 91447 Bytes: 67088 Bytes: 16805447 Interrupts: 0 Interrupts: 84207 Transmit Errors: 0 Receive Errors: 0 Packets Dropped: 0 Packets Dropped: 0 Bad Packets: 0 Max Packets on S/W Transmit Queue: 3 S/W Transmit Queue Overflow: 0 Current S/W+H/W Transmit Queue Length: 0 Broadcast Packets: 20 Broadcast Packets: 90757 Multicast Packets: 0 Multicast Packets: 0 No Carrier Sense: 0 CRC Errors: 0 DMA Underrun: 0 DMA Overrun: 0 Lost CTS Errors: 0 Alignment Errors: 0 Max Collision Errors: 0 No Resource Errors: 0 Late Collision Errors: 0 Receive Collision Errors: 0 Deferred: 0 Packet Too Short Errors: 0 SQE Test: 0 Packet Too Long Errors: 0 Timeout Errors: 0 Packets Discarded by Adapter: 0 Single Collision Count: 0 Receiver Start Count: 0 Multiple Collision Count: 0 Current HW Transmit Queue Length: 0 General Statistics: ------------------- No mbuf Errors: 0 Adapter Reset Count: 1 Adapter Data Rate: 2000 Driver Flags: Up Broadcast Running Simplex BitSupport ChecksumOffload PrivateSegment LargeSend DataRateSet 2-Port 10/100/1000 Base-TX PCI-X Adapter (141002) Specific Statistics: ------------------------------------------------------------------------ Link Status : Up Media Speed Selected: Auto negotiation Media Speed Running: 1000 Mbps Full Duplex PCI Mode: PCI-X (50-66) PCI Bus Width: 32-bit Latency Timer: 144 Cache Line Size: 128 Jumbo Frames: Disabled TCP Segmentation Offload: Enabled TCP Segmentation Offload Packets Transmitted: 0 TCP Segmentation Offload Packet Errors: 0 Transmit and Receive Flow Control Status: Enabled XON Flow Control Packets Transmitted: 0 XON Flow Control Packets Received: 0 XOFF Flow Control Packets Transmitted: 0 XOFF Flow Control Packets Received: 0 Transmit and Receive Flow Control Threshold (High): 45056 Transmit and Receive Flow Control Threshold (Low): 24576 Transmit and Receive Storage Allocation (TX/RX): 16/48
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