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1921 router EHWIC tagged vlan ports

Pderby
Level 1
Level 1

‎08-12-2014 09:10 AM - edited ‎03-07-2019 08:22 PM

In this configuration:

FIOS ONT Ethernet ---->  3750 Switch 5 interfaces on VLAN2 two of the 5 interfaces tagged to handle VLAN1 and 2 traffic ----> 1921 router WAN interface connected to one of the VLAN2 3750 interfaces, the two tagged interfaces go to two Mac Minis that handle low volume email.  The minis have one ethernet interface with WAN traffic on VLAN2, LAN traffic on VLAN1

I would like to move the VLAN2 interfaces from the 3750 Switch to the 1921 Router to have this configuration:

FIOS ONT Ethernet ---->  1921 G0/0 Interface WAN  with EHWIC-4G interfaces

Four fixed IP addresses, contiguous addresses but not a subnet,  are provided by FIOS and used for:

WAN router traffic on the 1921 port G0/0

WAN email traffic and local LAN traffic for the 2 Mac Minis each with one ethernet interface on the 1921 port g0/0/2 and G0/0/3. These are low volume email servers and they do not route.

Is there a way to configure the 1921 router so that the G0/0 and the EHWIC-4G interfaces G0/0/0 - G0/0/3 work as a switch for the WAN FIOS fixed IP addresses and interfaces G0/0/2 and G0/0/3 are 802.1q tagged and handle traffic for VLAN1 (the LAN) and VLAN2 (the WAN)?  G0/0/0 and G0/0/1 would be VLAN2 traffic only.  G0/0/2 and G0/0/3 would be tagged for VLAN1 and VLAN2 traffic

On a CISCO 3750 I can configure a group of interfaces to do what I want using these IOS statements:

interface GigabitEthernet2/0/43
 switchport access vlan 2
 switchport mode access
!
interface GigabitEthernet2/0/44
 switchport access vlan 2
 switchport mode access
!
interface GigabitEthernet2/0/45
 switchport access vlan 2
 switchport mode access
!
interface GigabitEthernet2/0/46
 switchport access vlan 2
 switchport mode access
!
interface GigabitEthernet2/0/47
 switchport access vlan 2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,2
 switchport mode trunk
 spanning-tree portfast
!
interface GigabitEthernet2/0/48
 switchport access vlan 2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,2
 switchport mode trunk
 spanning-tree portfast
!

Is there an equivalent way to congifgure the 1921 router to do the same switching using G0/0 and the G0/0/0 to G0/0/3 interfaces on the EHWIC-4?

 

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Rajeev Sharma
Cisco Employee
Cisco Employee

‎08-12-2014 12:27 PM

Hey Paul,

Well in this case i believe you will be able to configure the EHWIC with same commands as your switch for required roles, however i really doubt that if the onboard port i.e. G0/0 can be configured as layer 2 switchport.

But i still recommend to check if it can be done so use the IOS help (?) at the interafce configuration mode of G0/0 and look for switchport command as it will configure the port as layer 2.

If available you are good to go by configuring the link as access for vlan 2 else you may have to install another EHWIC or need to use a layer 3 link on your router.

HTH.

Regards,
RS.

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