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Posted by dennis on June 4, 2008, 2:44 am
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need....
rgds
dennis
> Is the 10 GB link an ethernet handoff? If so connect it to a switch
> on either side, and set up dot1q trunking. This will allow you to put
> the VLAN supporing 172.16.0.0/16 on both sides. This should also
> incidentally solve your routing issue. Here's some sample config with
> an explanation:
>
> SITE A:
>
> LAYER2/3 SWITCH:
>
> vlan 16,10
>
> interface gi 1/1
> description this is where you plug in the 10 gig link. of course
> you'd want a 10 gig switchport
> switchport
> switchport mode trunk
> switchport trunk allowed 16
>
> interface vlan 16
> description this is your shared vlan
> ip address 172.16.0.1 255.255.0.0
>
> interface vlan 10
> description this is a sample "site a only" vlan
> ip address 10.10.0.0 255.255.0.0
>
> router eigrp 100
> network 172.16.0.0
> network 10.0.0.0
> no auto-summary
>
> SITE B:
>
> LAYER 2/3 SWITCH:
>
> vlan 16,20
>
> interface gi 1/1
> description this is where you plug in the 10 gig link. of course
> you'd want a 10 gig switchport
> switchport
> switchport mode trunk
> switchport trunk allowed 16
>
> interface vlan 16
> description this is your shared vlan
> ip address 172.16.0.2 255.255.0.0
>
> interface vlan 20
> description this is a sample "site b only" vlan
> ip address 10.20.0.0 255.255.0.0
>
> router eigrp 100
> network 172.16.0.0
> network 10.0.0.0
> no auto-summary
>
> In this setup, any intra-vlan-16 traffic will be switched. I'd
> recommend devices at site A have a gateway of 172.16.0.1, and at Site
> B a gateway of 172.16.0.2 to cut down on crosstalk.
>
> Routing will be handled by virtue of EIGRP using VLAN 16 as a transit
> medium between the switches. So for example at Site A, if you were to
> sh IP route 10.20.0.0, you'd see this site is accessible via router
> 172.16.0.2
>
> So essentially your line will be a layer 2 link, using that shared
> VLAN to transit traffic.
>
> Once you've eliminated that shared VLAN, you can switch to routed
> interfaces if you like.
>
>
> > Hi group,
>
> > for a customer I design a new network.
> > These connect two different buildings which are connected through on
> > dedicated 10GB line.
>
> > There are different IP address ranges on these sides. Also there is a
> > requirement for one VLAN (ip address range 172.16.0.0/16) on both
> > sides.
>
> > In the final solution the two buildings should be connect through
> > eigrp because there are different IP address ranges on both sides.
> > Only for the migration there is a requirement for the one vlan on
> > borth side.
>
> > So how can I make a line as a layer 2 and layer 3 link ?
>
> > thanks
>
> > dennis
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