05-20-2010 04:52 AM - edited 03-06-2019 11:11 AM
Hi,
I am using a cisco 2811 router.I am running short of Layer3 interface.
Can i use L2 interface on the router for connecting my LAN segment.
To explain in detail.
I have totally 4 L3interface on the router.
2 interfaces will be used for WAN connection
1 intercae will be used for internet connection
1 interface for HSRP
Now can i use the L2 interface for connecting my LAN segment and still have connectivity to 2WAN,Internet,HSRP
Please help
Regards
Arlkumar
Solved! Go to Solution.
05-20-2010 11:48 AM
Yes you can do it. Consider HWIC-4ESW as a mini layer 3 switch with 4 ports. Now when you will add this card in ur 2811, you will see 4 L2 fastethernet ports. These ports are layer 2. So you need to create Interface Vlan 1 (SVI) and assign it your lan IP (which will serve as a gateway to your lan machines). Like this
Interface vlan 1
ip address 10.0.0.1 255.255.255.0
no shut
Now all the L2 ports of HWIC are part of vlan 1 and therefore part of this SVI.
Rate if helps
05-20-2010 05:00 AM
Please clarify what you mean by a L2 interface . Do you have like a 4 port hwic module installed ? If so then yes you can run your lan on that as you can route thru that card by using configured SVI's .
05-20-2010 05:16 AM
Hi,
Can I assign ip address if I am using hwic-4esw.
Regards
Arulkumar
05-20-2010 05:54 AM
Yes you would create a layer 3 SVI and a Layer 2 definition in the vlan database and then put the port on the card into that vlan ...
05-20-2010 11:48 AM
Yes you can do it. Consider HWIC-4ESW as a mini layer 3 switch with 4 ports. Now when you will add this card in ur 2811, you will see 4 L2 fastethernet ports. These ports are layer 2. So you need to create Interface Vlan 1 (SVI) and assign it your lan IP (which will serve as a gateway to your lan machines). Like this
Interface vlan 1
ip address 10.0.0.1 255.255.255.0
no shut
Now all the L2 ports of HWIC are part of vlan 1 and therefore part of this SVI.
Rate if helps
05-20-2010 10:41 PM
Thank you
05-20-2010 05:45 PM
Hi Arlkumar,
You can convert the swtich ports in an etherswitch module to Layer 3.
You can achieve this by the following commands-:
router(config)#int f0/1
router(config-int)#no switchport
router(config-int)#ip address ........
Hope this helps
Chris
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