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display multicast forwarding-table

Function

The display multicast forwarding-table command displays the multicast forwarding table.

Format

display multicast [ vpn-instance vpn-instance-name | all-instance ] forwarding-table [ group-address [ mask { group-mask | group-mask-length } ] | source-address [ mask { source-mask | source-mask-length } ] | incoming-interface { interface-type interface-number | register } | outgoing-interface { include | exclude | match } { interface-type interface-number | register | none } | { statistics | verbose } ] *

Parameters

Parameter Description Value
vpn-instance vpn-instance-name Specifies a VPN instance. vpn-instance-name specifies the name of the VPN instance. The name is a string of 1 to 31 characters.
all-instance Indicates all the instances. -
group-address Specifies the multicast group address, used to specify a multicast group. The address is in dotted decimal notation and ranges from 224.0.0.0 to 239.255.255.255.
mask Indicates the mask of a multicast address or source address. -
group-mask Specifies the mask of the multicast group address. The mask is in dotted decimal notation.
group-mask-length Specifies the mask length of the multicast group address. The value is a decimal integer that ranges from 4 to 32.
source-address Specifies the mask of the multicast source address. The mask is in dotted decimal notation.
source-mask Specifies the mask of the multicast source address. The mask is in dotted decimal notation.
source-mask-length Specifies the mask length of the multicast source address. The value is a decimal integer that ranges from 0 to 32.
incoming-interface Indicates the incoming interface of a multicast forwarding entry. -
interface-type interface-number Specifies the type and the number of an interface. -
register Indicates the register interface of a multicast forwarding entry. -
outgoing-interface Indicates the outgoing interface of a multicast forwarding entry. -
include Indicates the (S, G) entry list that contains the specified downstream interface. -
exclude Indicates the (S, G) entry list that does not contain the specified downstream interface. -
match Indicates the (S, G) entry list that matches the specified interface and the (S, G) entries have only one specified interface. -
none Indicates that the downstream interface list is null. -
statistics Indicates the statistics of the multicast forwarding table. -
verbose Indicates the detailed information of the multicast forwarding table. -

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

When the display multicast forwarding-table command is used,

  • If the vpn-instance or the all-instance is not specified, only the public network instance is displayed.

  • If the statistics is specified, you can view statistics about the following parameters:

    • Number of (S, G) entries being registered

    • Number of (S, G) entries that registered upstream interfaces

    • Number of (S, G) entries that have no downstream interface

    • Number of (S, G) entries in the Delete state

    • Number of (S, G) entries that needs to be delivered to IO boards

    • Number of (S, G) entries delivered to the forwarding table

    • Maximum number of downstream interfaces that a forwarding entry supports

    • Maximum number of (S, G) entries in the multicast forwarding table

Example

# Display the multicast forwarding table.
<sysname> display multicast forwarding-table

Multicast Forwarding Table of VPN-Instance: public net
Total 1 entries, 1 matched

00001. (10.0.2.100, 225.0.0.1)
     MID: 3, Flags: ACT
     After nat : (2.2.2.2, 225.0.0.1)
     Uptime: 00:23:15, Timeout in: 00:00:00
     Incoming interface: Ethernet0/0/0
     List of 1 outgoing interfaces:
       1: Ethernet0/0/2
         Activetime: 00:23:15
     Matched rate: 0 packets/sec, 0 bits/sec
     Matched 0 packets(0 bytes), Wrong If 0 packets
     Forwarded 0 packets(0 bytes)

00002. (10.0.2.100, 225.0.0.2)
     MID: 2, Flags: ACT
     After nat : (2.2.2.2, 225.0.0.2)
     Uptime: 00:23:15, Timeout in: 00:00:00
     Incoming interface: Ethernet0/0/0
     List of 1 outgoing interfaces:
       1: Ethernet0/0/2
         Activetime: 00:23:15
     Matched rate: 0 packets/sec, 0 bits/sec
     Matched 0 packets(0 bytes), Wrong If 0 packets
     Forwarded 0 packets(0 bytes)
# Display the multicast forwarding table of the VPN instance on a PE.
<sysname> display multicast vpn-instance 164 forwarding-table
Multicast Forwarding Table of VPN-Instance: 164
Total 1 entry, 1 matched

00001. (10.0.164.2, 225.0.0.1)
     MID: 1939, Flags: ACT
     After nat : (2.2.2.2, 225.0.0.1)
     Uptime: 00:02:08, Timeout in: 00:03:26
     Incoming interface: GigabitEthernet0/0/5.164
     List of 1 outgoing interfaces:
       1:  MTunnel164(encapsulated with group 228.8.8.8)
         Activetime: 00:23:15
     Matched rate: 100 packets/sec, 50000 bits/sec
     Matched 20774 packets(2240708 bytes), Wrong If 0 packets
     Forwarded 20774 packets(2240708 bytes)
Table 1 Description of the display multicast forwarding-table command output

Item

Description

Multicast Forwarding Table of VPN-Instance

VPN instance to which the multicast forwarding table corresponds

Total 1 entry, 1 matched

Total number of forwarding entries and number of eligible forwarding entries

00001

Sequence number of the (S, G) entry

(10.0.2.100, 225.0.0.1)

(S, G) entry in the multicast routing table

MID

Uniquely identifies the multicast forwarding entry in the Multicast Forward Information Base (MFIB) table. MID is used to rapidly search the multicast forwarding table.

Flags

Indicates the status flag of the (S, G) entry.

  • ACT: indicates that an active event is triggered.
  • DUM: indicates a dummy entry.
  • MISS: indicates that the nocache time needs to be reported.
  • DROP: indicates packet dropping.
  • LTH: indicates that the traffic volume is below the threshold.
  • DEL: indicates a deleted entry.
  • RST: indicates that registration of the known timer is started.
  • 2IODEL: indicates that an entry is deleted from the MFIB table, and the update needs to be synchronized to the IO board.
  • 2PDEL: indicates that an entry is deleted from the device, and the update needs to be synchronized to the IO board.
  • 2SYNC: indicates that the entry is contained in the MFIB table but it does not exist on the device.
  • 2ADD: indicates that the entry existing on the device has not been added to the MFIB table.
  • CLR: indicates that the MFIB table is resetting.
  • L2FWD: indicates that the device forwards Layer 2 traffic in multicast mode.
  • 2ACK: indicates that the VPN instance is waiting for the ACK message from the slave main control board.
  • 2RSED: indicates that the entry is waiting for retransmission.
  • IOACK: indicates that the VPN instance has received the ACK message from the LPU.
  • SACK: indicates that the VPN instance has received the ACK message forwarded by software.
  • BKCLR: indicates that the MFIB table on the slave main control board is resetting.
  • EXTR: indicates an extranet entry.
  • 2DEL: indicates that the entry deleted from the device has not been removed from the MFIB table.
  • PDEL: indicates that the entry does not exist on the device.
  • A denotes addition; D denotes deletion; I denotes upstream update; R denotes RP update; P denotes PMBR; F denotes flag.
  • S denotes SPT; E denotes encapsulation group update; US denotes status update; CS denotes status clearing.

After nat

NAT mapping entry of the (S, G) entry

Uptime

Period duration of the (S, G) entry

Timeout in

Remaining time of the (S, G) entry

Incoming interface

Upstream interface of the (S, G) entry

List of 1 outgoing interfaces
Indicates the downstream interface list. The contents of the downstream interface list are as follows:
  • Name and number of the outgoing interface
  • The existing time of outgoing interface
  • Multicast traffic that takes this interface as the outgoing interface, in bytes
  • Number of packets with an incorrect incoming interface
  • Forwarded multicast traffic, in bytes

MTunnel164 (encapsulated with group 228.8.8.8)

MTunnel interface number (public network group address used to encapsulate VPN data)

Eth-Trunk1.1

Dot1q interface number.

Activetime

Indicates the existing time of the outgoing interface of the (S, G) entry.

Msub-Tag total number

Indicates the Dot1q port information on the outgoing interface.

Vlanif100

VLANIF interface number.

Vlanif-port total number

Indicates the Layer 2 port information on the outgoing interface.

Matched rate

Number of packets and bits forwarded per second

Matched 0 packets (0 bytes)
Indicates the number of multicast packets and bytes that match the (S, G) entry.
NOTE:
If the value of the Matched field stops increasing:
  • If the current device is not an RP, the current device has not received any multicast data. This fault may be caused by the upstream device. Then check whether the PIM routing table on the upstream device contains correct (S, G) entries.
  • If the current device is already an RP, it indicates the RPT has been set up but the RP fails to receive the multicast data from the multicast source. This fault may be caused by a failure in source's DR registration. In such a case, contact Huawei technical support personnel.

Wrong If 0 packets

Indicates the number of packets with an incorrect incoming interface.

Forwarded 0 packets (0 bytes)
Indicates the number of packets and bytes forwarded by the (S, G) entry.
NOTE:

If the value of the Forwarded field does not increase over several minutes, packets fail to be forwarded. Contact Huawei technical support personnel to troubleshoot faults.
# Display information about backup inbound and outbound interfaces in the multicast forwarding table of the public network instance.
<sysname> display multicast forwarding-table
Multicast Forwarding Table of VPN-Instance: public net
Total 1 entry, 1 matched

00001. (10.0.5.100, 225.0.0.1)
     MID: 5, Flags: ACT
     Uptime: 17:05:56, Timeout in: 00:00:50
     Incoming interface: GigabitEthernet0/0/10
     Backup incoming interface: GigabitEthernet0/0/1
     Backup outgoing interface: GigabitEthernet0/0/10
     List of 2 outgoing interfaces:
       1: GigabitEthernet0/0/1
         Activetime: 03:52:38
       2: LoopBack5
         Activetime: 13:52:47
     Matched rate: 100 packets/sec, 50000 bits/sec
     Matched 58337 packets(1633436 bytes), Wrong If 29135 packets
     Forwarded 29202 packets(817656 bytes)
Table 2 Description of the display multicast forwarding-table command output

Item

Description

Backup incoming interface

Inbound interface information recorded in the backup (S, G) entry

Backup outgoing interface

Outbound interface information recorded in the backup (S, G) entry
Parent Topic: IPv4 Multicast Route Management Commands
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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