S5130-EI交换机下联话机自动识别voice-vlan自动获取IP地址失败问题案例

客户需求：客户使用我司S5130-EI作为接入交换机，HW的IP电话连接到交换机端口，IP电话下连业务PC，HW的IP电话属于vlan 9（voice-vlan），业务PC属于vlan 27。客户要求IP电话和业务PC通过DHCP方式自动获取地址，IP电话使用即插即用方式，通过LLDP协议协商voice-vlan。

S5130-EI的配置：

#
    voice-vlan track lldp
    voice-vlan mac-address 20f1-7c00-0000 mask ffff-ff00-0000 description huaweiA
    voice-vlan mac-address 244c-0700-0000 mask ffff-ff00-0000 description huaweiB
    #
    lldp global enable
    #
    interface GigabitEthernet1/0/1
    port link-mode bridge
    port link-type trunk
    port trunk permit vlan 1 9 27
    port trunk pvid vlan 27
    undo voice-vlan mode auto
    voice-vlan 9 enable
    storm-constrain broadcast ratio 5 2
    storm-constrain control shutdown
    stp edged-port
    poe enable
    loopback-detection enable vlan 9 27 
    loopback-detection action shutdown
    #

问题现象：IP电话可以获取地址，下联业务PC无法获取IP地址。

分析过程如下：

1、交换机端口同时下联IP电话和PC模式时，交换机端口需要将voice-vlan配置为auto模式：

voice-vlan mode auto

2、连接话机的端口配置为hybrid模式，并在接口下配置mac-vlan enable：

#
    interface GigabitEthernet1/0/1
    port link-mode bridge
    port link-type hybrid
    undo port hybrid vlan 1
    port hybrid vlan 27 untagged
    port hybrid pvid vlan 27
    voice-vlan 9 enable
    stp edged-port
    poe enable
    mac-vlan enable
    #

交换机接口配置更改之后重新测试，IP电话和业务PC都能自动获取到地址，但是IP电话获取地址的时间很长，大概要5到6分钟才能获取到IP地址，在交换机logbuffer中看到端口有不停UPdown的日志：

%Jan 10 05:57:38:680 2013 TX-13B-02 IFNET/3/PHY_UPDOWN: GigabitEthernet1/0/31 link     status is down.
    %Jan 10 05:57:38:680 2013 TX-13B-02 IFNET/5/LINK_UPDOWN: Line protocol on the           interface GigabitEthernet1/0/31 is down.
    %Jan 10 05:57:39:780 2013 TX-13B-02 POE/1/PSE_PORT_ON_OFF_CHANGE: 
    Trap : PSE 4, IfIndex 31, Detection Status 1.
    %Jan 10 05:58:00:137 2013 TX-13B-02 POE/1/PSE_PORT_ON_OFF_CHANGE: 
    Trap : PSE 4, IfIndex 31, Detection Status 3.
    %Jan 10 05:58:00:368 2013 TX-13B-02 IFNET/3/PHY_UPDOWN: GigabitEthernet1/0/31 link     status is up.
    %Jan 10 05:58:00:369 2013 TX-13B-02 IFNET/5/LINK_UPDOWN: Line protocol on the           interface GigabitEthernet1/0/31 is up.
    %Jan 10 05:58:07:165 2013 TX-13B-02 IFNET/3/PHY_UPDOWN: GigabitEthernet1/0/31 link      status is down.
    %Jan 10 05:58:07:168 2013 TX-13B-02 IFNET/5/LINK_UPDOWN: Line protocol on the            interface GigabitEthernet1/0/31 is down.
    ......
    %Jan 10 06:03:02:973 2013 TX-13B-02 LLDP/6/LLDP_CREATE_NEIGHBOR: Nearest bridge          agent new neighbor created on Port GigabitEthernet1/0/31 (IfIndex 31), Chassis ID      is 10.131.8.17, Port ID is 20f1-7c42-dff1.

3、经过确认mac-vlan与voice-vlan不能同时配置，重新更改交换机口配置如下：

#
    mac-vlan mac-address 20f1-7c00-0000 mask ffff-ff00-0000 vlan 9 
    mac-vlan mac-address 244c-0700-0000 mask ffff-ff00-0000 vlan 9 
    #
    interface GigabitEthernet1/0/1
    port link-mode bridge
    port link-type hybrid
    undo port hybrid vlan 1
    port hybrid vlan 9 27 untagged
    port hybrid pvid vlan 27
    stp edged-port
    poe enable
    mac-vlan enable
    #

更改接口配置之后再次测试，IP电话与业务PC都可以正确获取对应vlan的地址。

更改交换机配置解决问题：

#
    mac-vlan mac-address 20f1-7c00-0000 mask ffff-ff00-0000 vlan 9 
    mac-vlan mac-address 244c-0700-0000 mask ffff-ff00-0000 vlan 9 
    #
    voice-vlan track lldp
    voice-vlan mac-address 20f1-7c00-0000 mask ffff-ff00-0000 description huaweiA
    voice-vlan mac-address 244c-0700-0000 mask ffff-ff00-0000 description huaweiB
    #
    lldp global enable
    #
    interface GigabitEthernet1/0/1
    port link-mode bridge
    port link-type hybrid
    undo port hybrid vlan 1
    port hybrid vlan 9 27 untagged
    port hybrid pvid vlan 27
    stp edged-port
    poe enable
    mac-vlan enable
    #