Technical Documentation

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.

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

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

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