Do VLANs within a subnet need to have their own subnet for router on a stick?
I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
edited Apr 6 at 19:04
Cown
6,99131031
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
add a comment |
I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
edited Apr 6 at 19:04
Cown
6,99131031
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
add a comment |
I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
edited Apr 6 at 19:04
Cown
6,99131031
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
router vlan subnet trunk gateway
edited Apr 6 at 19:04
Cown
6,99131031
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
edited Apr 6 at 19:04
Cown
6,99131031
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
edited Apr 6 at 19:04
Cown
6,99131031
edited Apr 6 at 19:04
Cown
6,99131031
edited Apr 6 at 19:04
Cown
6,99131031
6,99131031
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
asked Apr 6 at 16:00
Jon StinnettJon Stinnett
161
161
add a comment |
add a comment |
3 Answers
3
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oldest
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I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
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Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited Apr 6 at 19:03
Cown
6,99131031
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
add a comment |
In practice, it is always a good idea to have VLAN with its own subnet. However, you can split a subnet into multiple VLANs since it is only a test topology and you don't have to worry about the IP address management challenges.
answered Apr 11 at 16:22
RickyRicky
1
add a comment |
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3 Answers
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active
oldest
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3 Answers
3
active
oldest
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active
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votes
I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
add a comment |
I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
add a comment |
I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
edited Apr 6 at 21:04
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
answered Apr 6 at 16:41
Zac67Zac67
33.3k22165
33.3k22165
add a comment |
add a comment |
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited Apr 6 at 19:03
Cown
6,99131031
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
add a comment |
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited Apr 6 at 19:03
Cown
6,99131031
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
add a comment |
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited Apr 6 at 19:03
Cown
6,99131031
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited Apr 6 at 19:03
Cown
6,99131031
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
edited Apr 6 at 19:03
Cown
6,99131031
edited Apr 6 at 19:03
Cown
6,99131031
edited Apr 6 at 19:03
Cown
6,99131031
6,99131031
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
answered Apr 6 at 16:48
Ron TrunkRon Trunk
40k33781
40k33781
add a comment |
add a comment |
In practice, it is always a good idea to have VLAN with its own subnet. However, you can split a subnet into multiple VLANs since it is only a test topology and you don't have to worry about the IP address management challenges.
answered Apr 11 at 16:22
RickyRicky
1
add a comment |
In practice, it is always a good idea to have VLAN with its own subnet. However, you can split a subnet into multiple VLANs since it is only a test topology and you don't have to worry about the IP address management challenges.
answered Apr 11 at 16:22
RickyRicky
1
add a comment |
In practice, it is always a good idea to have VLAN with its own subnet. However, you can split a subnet into multiple VLANs since it is only a test topology and you don't have to worry about the IP address management challenges.
answered Apr 11 at 16:22
RickyRicky
1
In practice, it is always a good idea to have VLAN with its own subnet. However, you can split a subnet into multiple VLANs since it is only a test topology and you don't have to worry about the IP address management challenges.
answered Apr 11 at 16:22
RickyRicky
1
answered Apr 11 at 16:22
RickyRicky
1
answered Apr 11 at 16:22
RickyRicky
1
answered Apr 11 at 16:22
RickyRicky
1
1
add a comment |
add a comment |
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