11-13-2010 10:07 PM - edited 03-06-2019 02:02 PM
Hi,
I have a Cisco 2948G-L3 switch with cat2948g-in-mz.120-7.W5.15d.bin. I need to use this switch as a normal layer 2 switch.
We already have another Cisco 3560 layer 3 switch with all vlan's configured and I need to use this 2948G-L3 as an edge switch for a vlan from 3560.
I connected the Uplink from cisco 3560 to an ordinary linksys layer 2 switch instead of this cisco 2948G-L3 and there is no issues with the connectivity, but its not working while I use 2948G-L3 switch instead of linksys switch. I gave no shut on all interfaces of 2948G-L3. Do I need to disable/enable anything in Cisco 2948G-L3 to make it act as an ordinary L2 switch?
Thanks for any help.
Ribin
11-13-2010 10:38 PM
Hi Ribin,
This is a way too old switch and I have never worked on it, yet, reading through it's documentation, it looks strictly L3.
So, it might not help using it as an edge switch. You may refer to this document, to see how this switch fits in network environment:
HTH.
Regards,
Deepak
11-13-2010 10:39 PM
Hello Ribin,
As you said earlier it was working as L3 Switch...now are you sure all its ports are working as L2.
You can verify port by "sh interface interface-name switchport" and the output should be Switchport: enabled
If not you can change its behavior by putting below command
interface range fa0/1-24
switchport
Or if you want to divide it in different broadcast domain you can configure vlan as per your design in different ports
Above is general recommendation irrespective of series of switch....
Regards
Mahesh
11-13-2010 11:03 PM
I am not able to give the command you mentioned.
Router(config)#interface ?
BVI Bridge-Group Virtual Interface
Cable CMTS interface
Dialer Dialer interface
FastEthernet FastEthernet IEEE 802.3
GigabitEthernet GigabitEthernet IEEE 802.3z
Lex Lex interface
Loopback Loopback interface
Null Null interface
Port-channel Ethernet Channel of interfaces
Tunnel Tunnel interface
Virtual-Template Virtual Template interface
Virtual-TokenRing Virtual TokenRing
Vlan Catalyst Vlans
Any other way by which we can make sure that it works as Layer 2?
- Ribin
11-13-2010 11:06 PM
Also I am not able to give "sh interface interface-name switchport" command either. The only available options are:
Router#sh interfaces ?
Controller Controller Port
FastEthernet FastEthernet IEEE 802.3
GigabitEthernet GigabitEthernet IEEE 802.3z
Null Null interface
accounting Show interface accounting
crb Show interface routing/bridging info
fair-queue Show interface Weighted Fair Queueing (WFQ) info
irb Show interface routing/bridging info
mac-accounting Show interface MAC accounting info
precedence Show interface precedence accounting info
random-detect Show interface Weighted Random Early Detection (WRED) info
rate-limit Show interface rate-limit info
11-13-2010 11:24 PM
Hi Ribin,
As I mentioned, probably this switch can't act as L2. You may try this command, if it's supported, which as per configuration seems like not supported:
- conf t
- int fa
- switchport
If switchport is not supported, it confirms it can't act as L2.
Regards,
Deepak
11-13-2010 11:38 PM
Those commands are not supported.
If the switch can act as L3, it should be working on Layer 2 as well, right?
- Ribin
11-14-2010 12:21 AM
Well you are correct, L2 support should always be there, however it cannot act as a strict L2 port, like other Cisco switches. That came as a surprise to me, however it's more about how it's aligned in the market place. Refer to the data sheet:
http://www.cisco.com/en/US/products/hw/switches/ps606/products_data_sheet09186a008009267f.html
In a way, it's working strictly as a router.
Regards,
Deepak
11-14-2010 01:29 AM
This switch should support bridge groups.
Try configuring a bridge group and assign interfaces to each bridge group to be part of the same network. This will be similar to how vlans will work. You should also be able to configure a bvi if required
11-14-2010 01:34 AM
Hi all,
I got it working. Configured a subinterface and then applied bridge-group in all interfaces.
- Ribin
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