VLANs management on Cisco 877.

Yes, you may need more flash memory and a different IOS featureset, I got stung with this few months ago.

What do you mean? Does the router hide some commands due to the fact it has not enough memory? The IOS version is quite up-to-date. It's 12.4(2)T2.

Alex.

enough memory?

You probably need an image with the advanced feature set in it. IOS comes in many feature set versions, as well as numbered versions. You have to specify the full image name to correctly identify what you have, not necessarily just the version number. You probably have to buy an additional feature set license to cover what you want, depending on how you bought the box originally.

The bigger feature sets require more RAM to run (and more flash to hold them), although the 877 probably comes with enough flash all around.

The Cisco Feature Navigator (cisco.com/go/fn) lists VLAN support on the 877 requiring licensing the Advanced Security or Advanced IP Services feature sets (available from your cisco reseller), as well as 128M of DRAM and 24 or 28M of FLASH to hold the images.

Ok guys,

I've got the right IOS image, that is "c870-advipservicesk9-mz.124-2.T2.bin".

I think that is the right one 'cause in privilege mode I can type "vlan database" and I get

Router#(vlan)

Below my questions:

I want the router to communicate with a switch by a trunk link. How to setup a trunk link on a 877? And moreover how many options do I have with my 877? I mean, I think I can setup a trunk link. But Can I setup FastEthernet interface to belong to different VLANs, i.e. FA0 to VLAN10, FA1 to VLAN20, FA2 to VLAN3, FA3 to VLAN4

Thank you so much for your patience and your support?

Alex.

Ok guys,

I've got the right IOS image, that is "c870-advipservicesk9-mz.124-2.T2.bin".

I think that is the right one 'cause in privilege mode I can type "vlan database" and I get

Router#(vlan)

Below my questions:

- I want the router to communicate with a switch by a trunk link. How to setup a trunk link on a 877?

- And moreover how many options do I have with my 877? I mean, I think I can setup a trunk link. But Can I setup FastEthernet interface to belong to different VLANs, i.e. FA0 to VLAN10, FA1 to VLAN20, FA2 to VLAN3, FA3 to VLAN4?

- is ISL supported on 877 router?

Thank you so much for your patience and your support.

Alex.

I must say I dont use use 877 much for Vlan, but if you try and put a switch port in vlan 2, then do show vlan it wont work.

Also I think you'll find it will only support .1q trunking.

1 last thing, if I remember when you get the correct stuff for vlans, you may be restricted to only 2-3 vlans and no more.

At the moment you'll find you'll be able to create vlans but not use them, or you'll be able to create vlans and it wont give you an error message, but they really wont be created.

database" and I get

a trunk link on a 877?

If it follows the other 8xx series that supported VLANs, then you now have a FastEthernet 1, 2, 3 & 4 that are your layer-2 "switch port" interfaces, as well your primary layer-3 ethernet ports.

You'd setup whatever layer-2 port you plug your trunk uplink into and configure it as a layer-2 trunk. (ie. switchport mode trunk). The other ports get switchport mode access on them.

setup a trunk link. But Can I setup

VLAN20, FA2 to VLAN3, FA3 to VLAN4?

Yes, you can put each fastethernet layer-2 port into a different vlan, although I believe this low-end router can only do 4 VLANs (trunked through, or terminated).

Very doubtful. Cisco's been dropping ISL support on many devices, especially on the low to mid end of things, and only still supporting it on the core type devices for compatibility sake.