Well that certainly is interesting seeing that it is part of the 4500 series switch command and the 4948's use the 4500 code . What code version is that running ? Looks like it has been there since 12.1.13EW if your code is older than that then it won't show up .
show vlan counters
To display the software-cached counter values, use the show vlan counters command.
show vlan [id vlanid] counters
Syntax Description
id vlanid
(Optional) Displays the software-cached counter values for a specific VLAN.
Defaults
This command has no default settings.
Command Modes
Privileged EXEC
Command History
Release
Modification
12.1(13)EW
Support for this command was introduced on the Catalyst 4500 series switches.
Usage Guidelines
If you enter the show vlan counters command without specifying the VLAN ID, the software-cached counter values for all VLANs are displayed.
Examples
This example shows how to display the software-cached counter values for a specific VLAN:
Switch# show vlan counters
* Multicast counters include broadcast packets
Vlan Id : 1
L2 Unicast Packets : 0
L2 Unicast Octets : 0
L3 Input Unicast Packets : 0
L3 Input Unicast Octets : 0
L3 Output Unicast Packets : 0
L3 Output Unicast Octets : 0
L3 Output Multicast Packets : 0
L3 Output Multicast Octets : 0
L3 Input Multicast Packets : 0
L3 Input Multicast Octets : 0
L2 Multicast Packets : 1
L2 Multicast Octets : 94
Switch>
