Cisco 2500 help/Newbie, thanks for the help in advance

Here is what I got,

Cisco 2500 Cisco Catalyst 2900 series switch

Currently at the house I have and in the order I have it connected.

BROADBAND CONNECTION \\ Linux Smoothwall firewall ( \\ Switch ( \\ Rest of the network.(Clients are DHCP from firewall)

I have 1.3 reserved for a server.

what I am wanting to do is implament a cisco 2500 series router into the mix. My first idea was to break the switch up (16 ports) 8 going to

1 subnet and 2 going to another (2 Vlans)

I wanted to see if the Cisco could break these broadcast domains up and make them talk...

the router has 1 ethernet interface and I heard that I could create a subinterface and assign it an ip address, and direct one subnet towards that sub interface.. as their default gateway.

hopefull, both subnets will use 1.1 as a gateway to get outbound but have 2 subnets, 2 vlans and so forth so on..

if you guys could please give me a couple of hints on what kind of powers this 2500 series possess also where I might be able to go and get some information that will help me actually use this thing at home. what ever i may help you guys out with in the future I will research and put in if I got the knowledge...

I hope you guys have a good one... thanks for the help.

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What you are trying to do is to implement what is called "router-on-stick"

Try configuring something like:

! Cisco 2500 config for VLAN trunk to 2900 switch

ip subnet-zero

int eth 0/0 o shut exit

int eth 0/0.10 encapsulation dot1Q 10 ip address exit

int eth 0/0.20 encapsulation dot1Q 20 ip address exit


! Cisco Catalyst 2900 switch config

interface FastEthernet0/1 switchport trunk encapsulation dot1q mode trunk exit

interface FastEthernet0/2 description switch port in VLAN 10 switchport access vlan 10 spanning-tree portfast exit

interface FastEthernet0/3 description switch port in VLAN 20 switchport access vlan 20 spanning-tree portfast exit

int vlan 10 ip address exit

ip default-gateway

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Thanks! I see what your doing.. you are putting 1 vlan on 1 port and 1 on the other.. using FA01 as the router port to the switch for trunking....


i know that this is not the ideal setup, but what would you do with this equipment other then throw it away cuz it is way outdated..

If you had a broad band connection, router, switch, and a firewall.... is there anything in particular you would do with it to gain knowledge on the cyntax and IOS?

Does this router have DHCP services? NAT? Firewall services? I really dont know.

Thanks for any answers that anyone can help out with

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Post the output of "show version" command for both devices.

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For experiments 2500 is fine, but you will be very disappointed that this router doesn't perform above 2.25Mbps. Meaning your LAN communication will be definetely penalized, and if your broadband connection is above 2Mbps than you won't get full speed there (don't blame ISP after that). 2900 series switch is find on the other hand.

I'd suggest you to build your network in way that you can quickly insert

2500 when you want to experiment and have it off when you need performance of your network.

Kind regards, iLya

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Charlie Root

Thank you for all the replies so far, I will post the version files on for both pieces of hardware soon.

I really want to get to know this equipment and are really interested in it...

Thanks alot for all the help..

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