06-19-2003 12:36 AM - edited 03-02-2019 08:15 AM
Hi,
I have a router with fastethernet interface. Current version 12.0(7)T, RELEASE SOFTWARE (fc2). Why I can't configure the dot1Q encap into this interface. Is it because the IOS not supported.
06-19-2003 02:44 AM
Hey there
The version that you are running does indeed support Dot1Q trunking. You didn't specify which router, but the bottom line is that Dot1Q encapsulation is specified on the SUB-INTERFACES, not on the main interface. The main interface holds the IP for the Native VLAN. All the other VLANs need to be configured on the sub-interfaces of the physical port and it is there that the "encapsulation dot1q
Here is a document on configuring Dot1Q trunking on 2600s running 12.0(x)T:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t1/8021q.htm#wp4621
Basically, you will configure a subinterface for all the different VLANs.
I.e. If you had 4 VLANs (1, 2, 3,4) coming from a trunk on a switch.. you would configure 3 sub-interfaces for the 3 encapsulated VLANs, and then configure the main physical interface for the Native (non-encapsulated) VLAN. in this example, we'll assume that VLAN 1 is the native VLAN, so we'll assign its subnet to the main interface.
/* The physical interface corresponds to the native VLAN
int fast 0/0
ip address 192.168.1.1 255.255.255.0
/* The first sub-interface is for the first encapsulated VLAN, which is VLAN2 in
/* our scenario
int fast 0/0.2
ip address 192.168.2.1 255.255.255.0
encap dot1q 2
int fast 0/0.3
ip address 192.168.3.1 255.255.255.0
encap dot1q 3
int fast 0/0.4
ip address 192.168.4.1 255.255.255.0
encap dot1q 4
I hope that this helps,
LW
06-19-2003 03:49 AM
Not sure if this is true for all versions of IOS or for all Cisco routers, but at least some require the IOS feature set to be "Plus" in order to do sub-interfaces and dot1q encapsulation.
06-19-2003 05:34 PM
Hi,
The router is cisco 7204VXR (NPE300) processor with 57344K/40960K bytes of memory. The poroblem is, when I creating the subinterface onto it, I didnt see any command encapsulataion ... as below
myrouter(config)#interface fa0/0.2
myrouter(config-subif)#?
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 propogated by bgp community string
carrier-delay Specify delay for interface transitions
cdp CDP interface subcommands
clns CLNS interface subcommands
default Set a command to its defaults
delay Specify interface throughput delay
description Interface specific description
exit Exit from interface configuration mode
ip Interface Internet Protocol config commands
isis IS-IS commands
iso-igrp ISO-IGRP interface subcommands
llc2 LLC2 Interface Subcommands
mls mls router sub/interface commands
mpls Configure MPLS interface parameters
mtu Set the interface Maximum Transmission Unit (MTU)
no Negate a command or set its defaults
ntp Configure NTP
rate-limit Rate Limit
Do the IOS (tm) 7200 Software (C7200-P-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2) support 802.1Q or ISL ??
06-19-2003 06:33 PM
You'll need IP Plus feature set(c7200-is-mz.120-7.T.bin). you have Service Provider feature set
06-19-2003 07:15 PM
Thks,
In my understanding for IOS 12.0.7 to support encap on ethernet inter. require IP Plus feature set. We have a plan to upgrade for higher version 12.2.(11)T do this can support encap. dot1Q on the interface. ?
I have other 7200 router (7206VXR (NPE400) processor (revision A) with 245760K/16384K bytes of memory - c7200-p-mz.122-11.T1.bin) it does support encap. dot1Q. The IOS feature set still Service Provider feature set. My question is is IOS 12.2(11)T1 IP plus supported. ?
I'm still confused on IOS ver capability.. can somebody point me the url..
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