Two FE Ports on Same Subnet 2

[AJ1982]

Hi,

We have a Cisco 2600 Router with Two FE ports and 1 ISDN port providing out internet. Internall we have two outside devices one PIX and one VPN Device which we currently connect to one ethernet port via a switch, is there a way to make use of this 2nd ethernet port, by having it on the same subnet so we dont have to rely on a switch as a single point of failure.

Any help greatly appreciated.

Thanks AJ

===

Fatman Superstar (Andrew James)

CCNA, CCAI

 

[vipergg]

The only thing I can think of is to chop the subnet into smaller chunks using a different mask than they are using now if you don't need all the addresses that your current mask supplies for the subnet such as if your mask is currently 255.255.255.0 you could makes 2 subnets out of it by using 255.255.255.128 . If you only need addresses for the 2 connecting links you could break it down to 255.255.255.252 .

 

[BuckWeet]

You could potentially make a bridge group, and assign both of those interfaces to the same bridge group..

you would then need to make a 'bridged virtual interface' then assign the IP to that..



BuckWeet

 

[AJ1982]

Ah yes a bridged group, thanks I will do some research

Thanks

AJ

===

Fatman Superstar (Andrew James)

CCNA, CCAI

 

[AJ1982]

Hmm thats cool but looks like I need to disable IP routing Bad right???

===

Fatman Superstar (Andrew James)

CCNA, CCAI

 

[ADB100]

No you don't need to disable routing, you turn on Integrated Routing & Bridging:

!
bridge 1 protocol ieee
bridge 1 route ip
!
interface fastethernet0/1
bridge-group 1
!
interface fastethernet0/2
bridge-group 1
!
interface bvi 1
ip address 10.1.1.1 255.255.255.0
!
interface serial 0/1
ip address 10.2.2.2 255.255.255.252
!


The BVI interface coresponds to your bridge-group (aka VLAN), the BVI is a Bridged Virtual Interface and is exactly the same concept as a VLAN interface on a Layer-3 switch.

HTH

Andy

 

[AJ1982]

Ahh brilliant thanks very much I will have a play around with this.

Thanks again

AJ

===

Fatman Superstar (Andrew James)

CCNA, CCAI