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Home > Archive > CCNA > December 2000 > Router on a stick
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| I would be happy if someone could give me a little help to configure a 3640 router for inter-VLAN routing. The router is allready operational and connected to the switch with the VLANs. I tried this:
interface fasthethernet 0/0
no ip address
interface fasthethernet 0/0.1
Description This is one of the VLANs
encapsulation dot1q 1
That's where I got the infamous unrecognised command message. There is no encapsulation command either on the interface or the subinterface. I verified that with the ? command. I tried configuring an IP address on the subinterface. Then I got a message saying that I cannot set an IP address on a subinterface unless that subinterface is part of a VLAN.
So what do I do to enable VLAN functionality on my router? It's running IOS 12.1(5)T.
Thanks for any help!
Terje
[This message has been edited by Terje (edited 12-21-2000).]
[This message has been edited by Terje (edited 12-21-2000).] | |
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| Terje,
Maybe you have some basic feature set that doesn't have inter-vlan routing?! I have a 2611 with two ethernets (not fast-ethernet, just plain old 10MB ethernets). I can subinterface the ethernets, and I have the "encapsulation dot1q x" command available. Here's the "show version", you may want to compare it to your "sh ver":
=====
Cisco2611# show version
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(5)T1, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 17-Aug-99 14:39 by cmong
Image text-base: 0x80008088, data-base: 0x80B5E15C
ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
Cisco2611 uptime is 1 week, 1 day, 58 minutes
System returned to ROM by reload at 16:10:36 UTC Mon Oct 16 2000
System image file is "flash:aaa0536.bin"
cisco 2611 (MPC860) processor (revision 0x202) with 22528K/2048K bytes of memory
.
Processor board ID JAD0352079I (4109927301)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
2 Ethernet/IEEE 802.3 interface(s)
2 Low-speed serial(sync/async) network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
=====
Cheers!
[This message has been edited by dmaftei (edited 12-21-2000).] | |
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| Thank you very much for your answer dmaftei!
quote:
Originally posted by dmaftei:
Maybe you have some basic feature set that doesn't have inter-vlan routing?!
That sounds plausible. I am not too familiar with Cisco feature sets and version codes. So far I have found a document that gives me the impression that I need a "plus" version of IOS e.g. IP Plus to do this. The document was old however.
quote:
I have a 2611 with two ethernets (not fast-ethernet, just plain old 10MB ethernets).
We do have a 2610. It's a production router that I do not want to do anything drastic with. However i could check to see if the command is available on it. You gave me the idea. I will try at work tomorrow (I am at home now, it's 23:21 local time).
The 3640 is a new router that I can still play with.
quote:
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(5)T1, RELEASE SOFTWARE (fc1)
Mine is 12.1(5)T. It came with a 12.0 version that did not support the fast ethernet module (Here's a challenge for you, guess how I could install a new IOS onto the router without a functional interface). Do you know the meaning of the T and T1 at the end of the version string?
Thanks for your input dmaftei!
Terje | |
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| quote:
Originally posted by Terje:
Here's a challenge for you, guess how I could install a new IOS onto the router without a functional interface.
xmodem?
quote:
Do you know the meaning of the T and T1 at the end of the version string?
I have no idea!! Anybody?
Cheers!
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| quote:
Originally posted by dmaftei:
Terje,
Maybe you have some basic feature set that doesn't have inter-vlan routing?! I have a 2611 with two ethernets (not fast-ethernet, just plain old 10MB ethernets). I can subinterface the ethernets, and I have the "encapsulation dot1q x" command available. Here's the "show version", you may want to compare it to your "sh ver":
You know, I read once that vlan trunking to a router was only supported on FastEthernet interfaces so i've been telling people that I didn't think you could create subinterfaces on routers with regular interfaces for ages. I guess it was probably old documentation. I guess as long as you have a relatively recent router that has interfaces that support trunking you're in good shape.
Man, I'm just turning out to be such a liar.
MadChef
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| Just to make sure there's no misunderstanding here. I only checked to see if I can subinterface ethernets, and if the "encapsulation" command is there for subinterfaces. I did NOT actually route between vlans (I may try it these days, though...)
Cheers!
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| Very interesting thread!
dmaftei -- if those 10 mbit interfaces will let you do ISL and/or 802.1q in the real world, I'd be VERY interested in hearing about it. I thought I'd read in Lammle that you can't trunk on a 10 megabit interface, but would have to either
1) Use a separate router interface for each VLAN to route between them, or
2) Get at least 100 mbit link between the switch and the router (as well as between the switches).
I'm getting my home lab set up, and have no fast ethernet on any of my routers. If I can trunk my switches on 10 mbit ethernet, I'll be a very happy camper (fast ethernet cards for routers not being cheap ...).
TIA,
doctorcisco
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Silicon is made from sand; nothing made from sand is allowed to wreck my day! | |
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| I've done some more research and testing. Here are my findings so far:
According to http://www.cisco.com/warp/public/cc...dlit/705_pp.htm I need IOS 11.1 for Virtual LAN (VLAN) Routing. No feature set mentioned.
According to http://www.cisco.com/univercd/cc/td...tm#xtocid553310 802.1q is supported on 2600 and 3600 as well as numerous others. No mention of software version, but the URL indicates IOS 12.0.
According to "cisco products quick reference guide" from april 2000 the 262x with fast ethernet interface(s) supports VLAN. The book says nothing about VLAN support on the 3640.
I tried "enc ?" on the ethernet interface as well as a subinterface on our 2610. "%Unrecognized command" is the reply. Its version string says 11.3(8)T1.
I tried the same on a 2611 with the firewall feature set. Same result. Its version string says 12.0(4)T.
I really wonder why dmaftei can do this and I cannot.
Of course dmaftei is right about xmodem. For those less experienced than dmaftei I will explain the problem and the solution:
As any CCNA will know, you can upgrade your IOS with copy tftp flash. I could not do that because my version of IOS did not support the only interface module on the router. The vendor gave me a free upgrade of IOS. But without a functional interface I could not use the copy command to install it (chicken and egg problem). In rommon there is a command xmodem that will initiate a transfer on the console port using the xmodem or ymodem protocol. Ymodem is the fastest, so use that if your terminal program allows it. I can assure you that transfering 4-5 MB at 9600 baud is not very quick, but it worked well. The xmodem command had an option to transfer the IOS image into DRAM and run it (without overwriting flash). That made it possible for me to backup the old IOS with copy flash tftp (just in case) before I installed the new image with copy tftp flash. The latter transfer went much faster 
Any more ideas to bring me further on the VLAN routing topic?
Terje | |
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| This is a bit over my head, but I thought I'd just make a note here that I'm sure I read somewhere that VLAN trunking was possible over a standard Ethernet port, but only if the router provided for that functionality...
Cheers,
Deets | |
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| quote:
Originally posted by Deets512:
This is a bit over my head, but I thought I'd just make a note here that I'm sure I read somewhere that VLAN trunking was possible over a standard Ethernet port, but only if the router provided for that functionality...
If you can do it on your own router, then you have a rather convincing case regardless of what you read
I just found the release notes for the IOS I am running at http://www.cisco.com/univercd/cc/td...600/rn3600t.htm . It states rather clearly that IP plus is needed  Also it tells me that I need more flash and DRAM. Case closed. Thanks for all help!
Terje
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| quote:
Originally posted by Terje:
quote:
Originally posted by Deets512:
This is a bit over my head, but I thought I'd just make a note here that I'm sure I read somewhere that VLAN trunking was possible over a standard Ethernet port, but only if the router provided for that functionality...
If you can do it on your own router, then you have a rather convincing case regardless of what you read
I just found the release notes for the IOS I am running at http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121relnt/3600/rn3600t .htm . It states rather clearly that IP plus is needed Also it tells me that I need more flash and DRAM. Case closed. Thanks for all help!
Terje
I'll be checking into this once I track down some cabling for my switches (the ethernet blades have RJ21 connectors on them; I have to track down some hydra cables for them). I'll report my results on the trunking question when I have them.
doctorcisco
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Silicon is made from sand; nothing made from sand is allowed to wreck my day! | |
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| Here's a couple of links I have bookmarked that somewhat apply to this thread. The first may not be helpful to all as you have to have a CCO ID to access it. It's the IOS Feature Navigator which can help you determine the appropriate IOS feature set you need for a particular function. http://cco.cisco.com/cgi-bin/Support/FeatureNav/FN.pl
The other is documentation on creating ISL trunks between a router and a switch. http://www.cisco.com/warp/public/473/24.html
It has this to say about code versions:
ISL VLAN-tagging has been available in the Cisco router since Cisco IOS version 11.1. With Cisco IOS versions 11.1 and 11.2, only IP and IPX with an 802.3 (Novell-Ether) encapsulation were supported over ISL. With Cisco IOS 11.3, additional encapsulations and protocols are now supported over ISL. Until Cisco IOS 11.3, if a protocol of encapsulation other than IP or IPX 802.3 was needed, then customers could use a feature called Integrated Routing and Bridging (IRB) which was available starting in Cisco IOS 11.2 IOS. In Cisco IOS 11.1, Enterprise Feature Set is needed to support ISL, and in Cisco IOS 11.2 (and later), only a Plus (that is, IP Plus, Desktop Plus) feature set is required. Any Fast Ethernet or Gigabit Ethernet interface on the routers will support ISL VLAN-trunking.
Judging by this I would say that normal ethernet interfaces wouldn't support trunking. Then again, it could be old docs and things may have changed. If someone actually does test this, I'd like to know the outcome.
MadChef, inappropriate as always. | |
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| A quick peek on a 2600 before I left work this AM showed 802.10 encapsulation available on a 10 megabit ethernet subinterface:
Router(config)#int e0/0.1
Router(config-subif)#encap ?
sde IEEE 802.10 Virtual LAN - Secure Data Exchange
doctorcisco | |
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| quote:
Originally posted by doctorcisco:
A quick peek on a 2600 before I left work this AM showed 802.10 encapsulation available on a 10 megabit ethernet subinterface:
Router(config)#int e0/0.1
Router(config-subif)#encap ?
sde IEEE 802.10 Virtual LAN - Secure Data Exchange
doctorcisco
This is very interesting doctorcisco. I guess you have a more capable version of IOS than my 3640. Do you know what feature sets are installed?
A quick search on the Cisco documentation CD tells me that ISL is only supported on fastethernet, but 802.1q and 802.10 are supported on any LAN interface. The latter even on HDLC links. Source (if you have the CD): http://127.0.0.1:8080/cc/td/doc/pro...cprt7/xcdvl.htm
I am not familiar with 802.10 and do not know how it compares to 802.1q or ISL. Anyone?
Terje
[This message has been edited by Terje (edited 12-23-2000).] | |
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| Excellent link dmaftei.
I have to correct myself on one point. I said that 802.1q (the VLAN standard) is supported on all LAN. What I should have said is that it is supported on all ethernet interfaces (including the 10Mbps variety). In my little world all LANs are ethernet 
Terje
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| quote:
Originally posted by Terje:
This is very interesting doctorcisco. I guess you have a more capable version of IOS than my 3640. Do you know what feature sets are installed?
A quick search on the Cisco documentation CD tells me that ISL is only supported on fastethernet, but 802.1q and 802.10 are supported on any LAN interface. The latter even on HDLC links. Source (if you have the CD): http://127.0.0.1:8080/cc/td/doc/product/software/ios121/121cgcr/switch_c/xcprt7/xcdvl .htm
I am not familiar with 802.10 and do not know how it compares to 802.1q or ISL. Anyone?
Terje
[This message has been edited by Terje (edited 12-23-2000).]
Thanks for the links, Terje, I'll definitely check out the CD when life settles down after Christmas.
The image file on the 2600 I "peeked at" reveals:
System image file is "flash:c2600-is-mz.120-12"
I don't have the codes for these files memorized, but I don't think it indicates that large a feature set.
I also looked on a few routers with 11.3 IOS's, and the encapsulation command on an ethernet subinterface is not available.
Router(config-subif)#encap ?
%unrecognized command
Looks like it's available only on certain feature sets in the 11.3 world, if it's there at all.
Sad his home lab needs fast ethernet to run ISL after all but glad he can use something else at least,
doctorcisco
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Silicon is made from sand; nothing made from sand is allowed to wreck my day! | |
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| quote:
Originally posted by doctorcisco:
System image file is "flash:c2600-is-mz.120-12"
I think the "-is-" part of the filename is the key to the feature set. I believe that "is" means "IP plus". I would be happy to see someone point us to the complete guide to dechiphering IOS image file names.
Terje | |
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