怎么查看端口是否加到组播组中

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(2)        通过使用display igmp-snooping group命令可以查看各交换机上IGMP Snooping组播组的信息。例如：

# 查看Switch A上IGMP Snooping组播组的信息。

<SwitchA> display igmp-snooping group

  Total 3 IP Group(s).

  Total 3 IP Source(s).

  Total 3 MAC Group(s).

  Port flags: D-Dynamic port, S-Static port, C-Copy port

  Subvlan flags: R-Real VLAN, C-Copy VLAN

  Vlan(id):5.

    Total 1 IP Group(s).

    Total 1 IP Source(s).

    Total 1 MAC Group(s).

    Router port(s):total 1 port.

            Eth1/1                (D) ( 00:01:30 )

    IP group(s):the following ip group(s) match to one mac group.

      IP group address:225.1.1.1

        (0.0.0.0, 225.1.1.1):

          Host port(s):total 0 port.

    MAC group(s):

      MAC group address:0100-5e01-0101

          Host port(s):total 0 port.

  Vlan(id):10.

    Total 1 IP Group(s).

    Total 1 IP Source(s).

    Total 1 MAC Group(s).

    Router port(s):total 0 port.

    IP group(s):the following ip group(s) match to one mac group.

      IP group address:225.1.1.1

        (0.0.0.0, 225.1.1.1):

          Host port(s):total 1 port.

            Eth1/2                (D) ( 00:03:23 )

    MAC group(s):

      MAC group address:0100-5e01-0101

          Host port(s):total 1 port.

            Eth1/2

  Vlan(id):20.

    Total 1 IP Group(s).

    Total 1 IP Source(s).

    Total 1 MAC Group(s).

    Router port(s):total 0 port.

    IP group(s):the following ip group(s) match to one mac group.

      IP group address:225.1.1.1

        (0.0.0.0, 225.1.1.1):

          Host port(s):total 1 port.

            Eth1/4                (D) ( 00:02:16 )

    MAC group(s):

      MAC group address:0100-5e01-0101

          Host port(s):total 1 port.

            Eth1/4

# 查看Switch C上VLAN 30内IGMP Snooping组播组的详细信息。

<SwitchC> display igmp-snooping group vlan 30 verbose

  Total 1 IP Group(s).

  Total 1 IP Source(s).

  Total 1 MAC Group(s).

  Port flags: D-Dynamic port, S-Static port, C-Copy port

  Subvlan flags: R-Real VLAN, C-Copy VLAN

  Vlan(id):30.

    Total 1 IP Group(s).

    Total 1 IP Source(s).

    Total 1 MAC Group(s).

    Router port(s):total 1 port.

            Eth1/1                (D) ( 00:01:15 )

    IP group(s):the following ip group(s) match to one mac group.

      IP group address:225.2.2.2

        (0.0.0.0, 225.2.2.2):

          Attribute:    Host Port

          Host port(s):total 1 port.

            Eth1/2                (D) ( 00:02:35 )

    MAC group(s):

      MAC group address:0100-5e02-0202

          Host port(s):total 1 port.

            Eth1/2

由上可知，Switch A的端口Ethernet1/2和Ethernet1/4下都有组播组G1的接收者，Switch C的端口Ethernet1/2下有组播组G2的接收者。

(3)        通过使用display igmp interface命令可以查看各路由器的主机侧接口上IGMP的配置和运行情况。例如：

# 查看Router C的主机侧接口Ethernet1/1上IGMP的配置和运行情况。

<RouterC> display igmp interface ethernet 1/1

 Ethernet1/1(10.110.2.1):

   IGMP is enabled

   Current IGMP version is 2

   Value of query interval for IGMP(in seconds): 60

   Value of other querier present interval for IGMP(in seconds): 125

   Value of maximum query response time for IGMP(in seconds): 10

   Querier for IGMP: 10.110.2.1 (this router)

  Total 1 IGMP Group reported

由上可知，Router C的接口Ethernet1/1上运行了IGMPv2，并由该接口作为IGMP查询器。

(4)        通过使用display msdp brief命令可以查看路由器之间MSDP对等体建立的情况。例如：

# 查看Router B上MSDP对等体的简要信息。

<RouterB> display msdp brief

MSDP Peer Brief Information of VPN-Instance: public net

  Configured   Up           Listen       Connect      Shutdown     Down

  1            1            0            0            0            0

  Peer's Address    State    Up/Down time    AS     SA Count   Reset Count

  10.2.2.2          Up       00:10:17        ?      1          0

# 查看Router C上MSDP对等体的简要信息。

<RouterC> display msdp brief

MSDP Peer Brief Information of VPN-Instance: public net

  Configured   Up           Listen       Connect      Shutdown     Down

  1            1            0            0            0            0

  Peer's Address    State    Up/Down time    AS     SA Count   Reset Count

  10.1.1.1          Up       00:10:17        ?      1          0

由上可知，Router B和Router C各自的Loopback1接口之间已建立起了MSDP对等体关系。

(5)        通过使用display pim routing-table命令可以查看路由器上PIM路由表的内容。例如：

# 查看Router B上有关组播组225.1.1.1的PIM路由表内容。

<RouterB> display pim routing-table 225.1.1.1

 VPN-Instance: public net

 Total 1 (*, G) entry; 1 (S, G) entry

 Total matched 0 (*, G) entry; 0 (S, G) entry

# 查看Router C上有关组播组225.1.1.1的PIM路由表内容。

<RouterC> display pim routing-table 225.1.1.1

 VPN-Instance: public net

 Total 1 (*, G) entry; 1 (S, G) entry

 Total matched 1 (*, G) entry; 1 (S, G) entry

 (*, 225.1.1.1)

     RP: 1.1.1.1 (local)

     Protocol: pim-sm, Flag: WC

     UpTime: 00:15:04

     Upstream interface: Register

         Upstream neighbor: NULL

         RPF prime neighbor: NULL

     Downstream interface(s) information:

     Total number of downstreams: 1

         1: Ethernet1/1

             Protocol: igmp, UpTime: 00:15:04, Expires: -

 (10.110.1.100, 225.1.1.1)

     RP: 1.1.1.1 (local)

     Protocol: pim-sm, Flag: SPT 2MSDP ACT

     UpTime: 00:20:28

     Upstream interface: Serial2/1

         Upstream neighbor: 192.168.2.1

         RPF prime neighbor: 192.168.2.1

     Downstream interface(s) information:

     Total number of downstreams: 1

         1: Ethernet1/1

             Protocol: pim-sm, UpTime:  - , Expires:  -

由上可知，组播组G1当前有效的RP为Router C的Loopback0接口。