possible to configure 2621 as router on a stick connected to a 3550?

[hellzx]

Heres my situation.... I have a 2621 with a nm-4e and a 3550 48 emi. I have a dsl connection and a cable connection each connected to an ethernet port on the nm-4e.
I would like to create 2 lans (one for each connection) using only one fast ethernet port from the 2621 to the switch. Please let me know of the ways i can do this, there should be more than one way right?

 

[vipergg]

The only way to do that is if the nm 4e supports trunking . Some people say you can do this on a 10 meg ethernet though i haven't seen it , if it will you would have to have pretty new code on the 2600 .

 

[DanInRaleigh]

vipergg,

..i think the below is from 12.2.x.

interface Ethernet0/0
no ip address
full-duplex
!
interface Ethernet0/0.8
encapsulation dot1Q 8
ip address 10.8.0.1 255.255.255.0


hellzx,
..you sure can support these two internet connections (cable and dsl) with the router on stick..
...but remeber you will have to PAT/NAT.. because the ISP's modems will not know how to route to the subnets you create on your LAN

http://www.daniel-white.com

 

[hellzx]

Im not trying to trunk the eth, only the fastethernet. Below is partial cfg of what im trying to do, I just want to know if it can work or not. I want to avoid plugging any cable from the nm-4e to the switch, just doesnt seem to work right, always flashes orange, ive tried all duplex and speed settings with spt pf on and off, same result.


interface FastEthernet0/1
Description trunk line to 3550
no ip address
duplex auto
speed auto

interface Fastethernet0/1.1
description to vlan 6 on 3550
encapsulation dot1Q 6 native
ip address 10.6.6.1 255.255.255.0
ip nat inside

interface Fastethernet0/1.2
description to vlan 66 on 3550
encapsulation dot1Q 66
ip address 10.66.66.1 255.255.255.0
ip nat inside

interface Ethernet1/1
description dsl line from modem
ip address dhcp
ip nat outside
half-duplex
!
interface Ethernet1/2
description cable line from modem
ip address dhcp
ip nat outside
half-duplex


ip nat inside source list 101 interface Ethernet1/1 overload
ip nat inside source list 102 interface Ethernet1/2 overload


access-list 101 permit ip 10.6.6.0 0.0.0.255 any
access-list 102 permit ip 10.66.66.0 0.0.0.255 any

 

[hellzx]

Sorry i know its a router question, but if it can work I'll ask about the switch part next lol=).

 

[DanInRaleigh]

...how is the switch port built..
...is it enabled for trunk mode..encapsualtion dotq..
...and thats kind of wierd the port flashes oarnge..i dont remeber it doing that even if one side is hard coated for trunk and the other side not...


router config below..for working scenario..

interface Ethernet0/0
no ip address
full-duplex

interface Ethernet0/0.15
encapsulation dot1Q 15
ip address 10.15.0.1 255.255.255.0


..switch below

interface FastEthernet0/1
duplex full
switchport access vlan 15
switchport trunk encapsulation dot1q
switchport mode trunk

http://www.daniel-white.com

 

[DanInRaleigh]

...also..i think you have to designate that vlan 6 be native "on the switch"..



interface Fastethernet0/1.1
description to vlan 6 on 3550
encapsulation dot1Q 6 native <---

...and everythings looks good on the router config....

http://www.daniel-white.com

 

[hellzx]

Shoot i forgot i had to go help a friend with a basic wireless router setup lol. Thanks for the replys, i will work on later, cisco is addicting!

 

[ADB100]

The replies in this post will help you set up a Router on a Stick but I must ask why do you want to do this when you have a Catalyst 3550 with the EMI Image? The 3550 will be massively more efficient at forwarding traffic between VLAN's than the 2621.
Unless you have some more advanced requirements that aren't possible on the 3550 (NAT for example) I would configure your inter-VLAN routing on the 3550 and use a routed interface to the 2621....

Andy

 

[hellzx]

Thanks for replying andy. My current setup is for remote lab pursoses mainly, i want both connections natted outside by the eth ports from the nm-4e while using only 1 fe port from the 2621 for the lans. The remaining eths and fe is mainly used for telnet access to other routers. I just want more play ground ports so i can practice lab better. With the extra ports it allows me to configure frame-switching remotely from 3 routers, my friend also uses the lab remotly, just trying to make it more flexible.

http://home.comcast.net/~noshut/d1.jpg

 

[hellzx]

I wish glbp worked for a single router running multiple connections. Only other choice is oer on xm or higher router i think, dont have that good of a router though.