Design Question - On physikal Line as Layer 2/3
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Posted by dennis on June 3, 2008, 11:10 am
Please log in for more thread options 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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Posted by jseemann@gmail.com on June 3, 2008, 11:52 am
Please log in for more thread options 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. | ||||||||||||||||
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Posted by dennis on June 4, 2008, 2:44 am
Please log in for more thread options Thank you for the detailed explanation. This solution is what I
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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>
> 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