Trunking over Ethernet.

Answered Question
Jun 8th, 2010

Am I able to trunk from a switch to a router if my router does not have Fast Ethernet -

The router I am using only has an Ethernet port -

Joe

I have this problem too.
0 votes
Correct Answer by Federico Coto F... about 6 years 6 months ago

Joseph,

There's a Cisco tool called Cisco Feature Navigator.
It shows which features can be done for each image among other things.

802.1q is not supported on your current IOS.

Federico.

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Federico Coto F... Tue, 06/08/2010 - 15:00

Hi Joseph,

Are you using a switch that only supports (or is only configured) for 10Mbps?

Federico.

Federico Coto F... Tue, 06/08/2010 - 15:21

Ok but the interface of the 2950 that you're connecting to the router is not hard-coded to 10Mbps?

If you change the configuration from trunk to access on the switch (disable trunking on the router side), does it work?

I just want to see if the problem is with the trunking (don't think so), or the problem is there' s no connectivity at all between the switch and the router).

Federico.

joealbergo Tue, 06/08/2010 - 15:27

Federico

I'll tell you what I am doing so you have a better understanding.

I am hooking up a switch to a router so I can incorporate inter-vlan routing.

I have a switch with 10/100 ports and I have a router that only has 10base-T interface card.

I want to create a trunk between the router and the switch so that I can inter-vlan.

When I go to assign the IP address on the router sub-interface it tells me:

'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."

Jon Marshall Tue, 06/08/2010 - 15:30

joealbergo wrote:

F

When I go to assign the IP address on the router sub-interface it tells me:

'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."

Joe

You need to enter the encapsulation before you can enter an IP ie.

int fa0/1.10

encapsulation dot1q 10

ip address 192.168.5.1 255.255.255.0

Jon

Federico Coto F... Tue, 06/08/2010 - 15:30

Before assigning the IP on the sub-interface, you need the command:  encapsulation dot1q xx  --> xx is the number of the VLAN

Otherwise you can't configure an IP address.

Federico.

Jon Marshall Tue, 06/08/2010 - 15:28

Joe

You can trunk on 10mbps interfaces but support for this was brought in later than with 100Mbps interfaces. Also you need the correct feature set to support 802.1q trunking.

So what is the router you are using and what is the feature set -  a "sh version" will give this info.

Jon

joealbergo Tue, 06/08/2010 - 15:33

Router#sh version
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.0(5)XK1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
TAC:Home:SW:IOS:Specials for info
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 14-Sep-99 15:53 by jjgreen
Image text-base: 0x80008088, data-base: 0x8073CEEC

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
ROM: C2600 Software (C2600-I-M), Version 12.0(5)XK1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

Router uptime is 1 hour, 13 minutes
System returned to ROM by power-on at 12:59:03 UTC Sat Feb 6 2010
System image file is "flash:c2600-i-mz.120-5.XK1"

cisco 2610 (MPC860) processor (revision 0x202) with 22528K/2048K bytes of memory.
Processor board ID JAB03200221 (2019881742)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
1 Ethernet/IEEE 802.3 interface(s)
1 Serial network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2142

joealbergo Tue, 06/08/2010 - 15:43

When I do encap dot1q command.

It does not know what it is. I might not be able to do this with this switch here in my school's lab.

Joe

Correct Answer
Federico Coto F... Tue, 06/08/2010 - 15:46

Joseph,

There's a Cisco tool called Cisco Feature Navigator.
It shows which features can be done for each image among other things.

802.1q is not supported on your current IOS.

Federico.

joealbergo Tue, 06/08/2010 - 15:47

Federico

Jon

Thank you guys.

I am going to try another part of the lab here.

I am going to start over with the project -

Joe

Leo Laohoo Tue, 06/08/2010 - 15:54

When I do encap dot1q command.  It does not know what it is.

2940/2950 and 2960 switches only support dot1q trunking therefore you don't need to enter the "encapsulation dot1q".

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