目标

目的是设置 LACP。

/etc/modprobe.d/bonding.conf

alias bond0 bonding
options bond0 miimon=100 mode=4 lacp_rate=1

/etc/sysconfig/network-scripts/ifcfg-bond0

ONBOOT=yes
BOOTPROTO=static
USERCTL=no
DEVICE=bond0
IPADDR=X
GATEWAY=Y
PREFIX=24

/etc/sysconfig/network-scripts/ifcfg-eth0

ONBOOT=yes
BOOTPROTO=static
USERCTL=no
DEVICE=eth0
MASTER=bond0
SLAVE=yes

以太通道

switch#show etherchannel X summary
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port


Number of channel-groups in use: 3
Number of aggregators:           3

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
X     PoX(SD)        LACP        Gi0/A(I)   Gi0/B(I)   Gi0/C(I)
                                 Gi0/D(I)

interface Port-channelX
 switchport mode access
!

端口

interface GigabitEthernet0/A
 switchport access vlan X
 switchport mode access
 channel-protocol lacp
 channel-group X mode active
!

日志

Mar  2 11:17:50.529: %SW_MATM-4-MACFLAP_NOTIF: Host <MAC_ADDRESS> in vlan X is flapping
between port Gi0/Y and port Gi0/Z

问题

一旦在 Linux 服务器上重新启动网络服务，从属以太网适配器就会启动并且系统仍然可以访问：

1. 为什么 Cisco 日志指示主机在端口之间摆动？
2. 为什么可以在端口通道关闭时访问系统？