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New Member

2600 not able to add vlan envapsulation

I have a 2600 and I am trying to configure subinterfaces on a f0/0 port. I read that my code supports vlan encapsulation but when I try to add encapsulation 802.1d to the interface the command is non-existant. Here is the show ver and the error message:

System image file is "flash:c2600-io3-mz.123-26.bin"

cisco 2621 (MPC860) processor (revision 0x600) with 59392K/6144K bytes of memory


Processor board ID JAD05370MLQ (1938564210)

M860 processor: part number 0, mask 49

Bridging software.

X.25 software, Version 3.0.0.

2 FastEthernet/IEEE 802.3 interface(s)

2 Serial(sync/async) network interface(s)

32K bytes of non-volatile configuration memory.

16384K bytes of processor board System flash (Read/Write)

Router(config-subif)#encapsulation 802.1d


% Invalid input detected at '^' marker.

Router(config-subif)#ip address

% Configuring IP routing on a LAN subinterface is only allowed if that

subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,

or ISL vLAN.


  • LAN Switching and Routing

Re: 2600 not able to add vlan envapsulation


802.1d is spanning-tree, I think you want 802.1q or ISL for your encapsulation.



New Member

Re: 2600 not able to add vlan envapsulation

My bad. typed in d insead of q. but still


% Unrecognized command


Interface configuration commands:

arp Set arp type (arpa, probe, snap) or timeout

backup Modify backup parameters

bandwidth Set bandwidth informational parameter

bgp-policy Apply policy propagated by bgp community string

bridge-group Transparent bridging interface parameters

cdp CDP interface subcommands

default Set a command to its defaults

delay Specify interface throughput delay

description Interface specific description

exit Exit from interface configuration mode

glbp Gateway Load Balancing Protocol interface commands

ip Interface Internet Protocol config commands

keepalive Enable keepalive

llc2 LLC2 Interface Subcommands


Re: 2600 not able to add vlan envapsulation

Should be configured something like this.

7500(config)#int fast 5/1/1.1

7500(config-subif)#encapsulation dot1Q 1 native

7500(config-subif)#ip address


7500(config)#int fast 5/1/1.2

7500(config-subif)#encapsulation dot1Q 2

7500(config-subif)#ip address


New Member

Re: 2600 not able to add vlan envapsulation

Thanks but the encapsulation command doesn't exist. I verified that the router/code supports vlan encapsulation but it isn't allowing me to enter the encapsulation command.

Re: 2600 not able to add vlan envapsulation

Are you try to use the encapsulation command on a fastethernet interface?



HTH, John *** Please rate all useful posts ***
New Member

Re: 2600 not able to add vlan envapsulation

yes it is the on-board f0/0 and f0/1

Hall of Fame Super Blue

Re: 2600 not able to add vlan envapsulation

You don't have the right feature set. You have IP/FW/IDS which does not support 802.1q. IP Plus & Enterprise do. Have a look at Feature Navigator to select correct feature set for your needs -


New Member

Re: 2600 not able to add vlan envapsulation

You are my hero!!

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