在AIX 5L上使用绑定网卡（etherchannel)(2)

#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
    ......