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    Monitoring Status and Configuration Information for VLAN Subinterfaces

    Purpose

    Display configuration and status information for a specified VLAN subinterface or for all VLAN subinterfaces configured on the router. You can use the summary keyword to display only the counts of all VLAN subinterfaces and VLAN major interfaces configured on the router. You can use the vlan or svlan keywords to display information about specific VLAN IDs or S-VLAN IDs.

    Use the agent-circuit-identifier keyword to display information about VLAN subinterfaces that are created based on the agent-circuit-id information in the option 82 field of DHCP messages or in the DSL Forum VSA 26-1 of PPPoE PADR and PADI packets. Using this keyword causes the router to display the agent-circuit-identifier string in the command output.

    Action

    To display full status and configuration information for all VLAN subinterfaces configured on the router:

    host1#show vlan subinterface
            Interface        Status   MTU  Svlan Id Vlan Id  Ethertype  Type
    --------------------- ---------- ---- -------- -------- --------- -------
    ATM 3/0.1.2               Up       1522 ----     11       ----      Static
    ATM 3/0.1.3               Up       1522 ----     12       ----      Static
    ATM 3/1.1.1               Up       1522 ----     13       ----      Static
    ATM 3/1.1.2               Up       1522 ----     14       ----      Static
    ATM 3/2.1.1               Down     1526 4        255      0x9100    Static
    FastEthernet 4/5.1        Up       1522 ----     1        ----      Dynamic
    6 vlan subinterfaces found

    To display full status and configuration information for the specified VLAN subinterface:

    host1#show vlan subinterface fastEthernet 4/5.1
            Interface       Status   MTU  Svlan Id Vlan Id  Ethertype  Type
    ---------------------- -------- ---- -------- -------- --------- -------
    FastEthernet 4/5.1        Up     522 ----       1       ----      Dynamic
    1 vlan subinterface found
    

    To display full status and configuration information for the specified S-VLAN ID:

    host1#show vlan subinterface svlan id 100 53
            Interface       Status   MTU  Svlan Id Vlan Id Ethertype  Type
    ---------------------- -------- ---- -------- -------- --------- -------
    FastEthernet 0/0.1        Up     1526 100      53       0x9100    Static
    FastEthernet 4/6.1        Up     1526 100      53       0x9100    Dynamic
    2 vlan subinterfaces found
    

    To display full status and configuration information for the specified dynamic VLAN subinterface:

    host1#show vlan subinterface fastEthernet 4/6.1000053
            Interface         Status  MTU  Svlan Id Vlan Id Ethertype Type
    ------------------------- ------ ---- -------- -------- --------- -------
    FastEthernet 4/6.1000053  Up      1526 100      53       0x9100   Dynamic
    Auto configure interface(s)   : IP  PPPoE
    Detected dynamic interface    : PPPoE
    Interface types in lockout    : none
    Lockout state (seconds)       : Min Max Current Elapsed Next
    ------------------------------- --- --- ------- ------- ----
    IP                                1 300       0       0    1
    PPPoE                             1 300       0       0    1
      In: Bytes 1040, Packets 15
       Multicast 0, Broadcast 1
       Errors 0, Discards 0
      Out: Bytes 984, Packets 15
       Multicast 0, Broadcast 1
       Errors 0, Discards 0
    ARP Statistics:
      In: ARP requests 0, ARP responses 0
       Errors 0, Discards 0
      Out: ARP requests 0, ARP responses 0
       Errors 0, Discards 0
    

    To display status information for dynamic VLAN subinterfaces that are created based on agent-circuit-identifier information:

    host1#show vlan subinterface
         Interface          Status  MTU  Svlan Id Vlan Id  Ethertype   Type
    ---------------------- -------- ---- -------- -------- --------- ---------
    FastEthernet 4/0.1       Up     1522  2       ----     ----      Dynamic *
    FastEthernet 4/0.2       Up     1522  2       ----     ----      Dynamic *
    2 vlan subinterfaces found
    * Created via agent circuit identifier
    host1#show vlan subinterface agent-circuit-identifier
            Interface         Svlan Id Agent-Circuit-Identifier
    ------------------------- -------- --------------------------
    FastEthernet 4/0.1        2        ---- 
    FastEthernet 4/0.2        2        0200D0CB2729E5
    

    Meaning

    Table 1 lists the show vlan subinterface command output fields.

    Table 1: show vlan subinterface Output Fields

    Field Name

    Field Description

    Interface

    Type and specifier of the VLAN subinterface

    Status

    Status of the VLAN subinterface: up, down, dormant, lowerLayerDown, absent

    MTU

    Maximum allowable size (in bytes) of the MTU for the VLAN subinterface

    Svlan Id

    S-VLAN ID value, if configured

    Vlan Id

    VLAN ID value for the VLAN subinterface

    Ethertype

    S-VLAN Ethertype value, if configured

    Type

    Type of VLAN subinterface:

    • Static—VLAN or S-VLAN subinterface was configured statically
    • Dynamic—VLAN or S-VLAN subinterface was configured dynamically

    Auto configure interface(s)

    Types of dynamic upper interfaces configured with the auto-configure command: IP or PPPoE

    Detected dynamic interface

    Type of dynamic upper interface detected during autoconfiguration: IP, PPPoE, or (if no packet has been received) none

    Interface types in lockout

    Encapsulation types currently experiencing lockout: IP, PPPoE, or none

    Lockout state (seconds)

    Settings of encapsulation type lockout for the upper-layer encapsulation type indicated:

    • Min—Minimum lockout time, in seconds
    • Max—Maximum lockout time, in seconds
    • Current—Current lockout time, in seconds; displays 0 (zero) if lockout is not occurring
    • Elapsed—Time elapsed into the lockout time, in seconds; displays 0 (zero) if lockout is not occurring
    • Next—Lockout time for the router to use for the next lockout event, in seconds

    In

    Analysis of inbound traffic on this interface:

    • Bytes—Number of bytes received on the VLAN or S-VLAN subinterface
    • Packets—Sum of all unicast, broadcast, and multicast packets received on the VLAN or S-VLAN subinterface
    • Multicast—Number of multicast packets received on the VLAN or S-VLAN subinterface
    • Broadcast—Number of broadcast packets received on the VLAN or S-VLAN subinterface
    • Errors—Total number of errors in all received packets; some packets might contain more than one error
    • Discards—Total number of discarded incoming packets

    Out

    Analysis of outbound traffic on this interface:

    • Bytes—Number of bytes sent on the VLAN or S-VLAN subinterface
    • Packets—Number of packets sent on the VLAN or S-VLAN subinterface
    • Multicast—Number of multicast packets received on the VLAN or S-VLAN subinterface
    • Broadcast—Number of broadcast packets received on the VLAN or S-VLAN subinterface
    • Errors—Total number of errors in all transmitted packets; some packets might contain more than one error
    • Discards—Total number of discarded outgoing packets

    ARP Statistics

    Analysis of ARP traffic on this interface; In fields are for traffic received on the interface and Out fields are for traffic sent on the interface:

    • ARP requests—Number of ARP requests
    • ARP responses—Number of ARP responses
    • Errors—Total number of errors in all ARP packets
    • Discards—Total number of discarded ARP packets

    Total VLAN interfaces

    Total numbers of VLAN subinterfaces and VLAN major interfaces configured on the router; only this field appears when you specify the summary keyword

    Published: 2014-08-14