Mapping of Vlans on WS-C3750E-48TD-S

Answered Question
May 3rd, 2012

Hi

My question is about WS-C3750E-48TD-S and WS-C3750E-24TD-S Switches

What are the limitations of the mapping of VLANs on this device?

Is it limited by number or by interface?

Does the configuration of an interface has spread all interfaces ?

Thank you for yours replies

Regards

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Correct Answer by andymanc120 about 1 year 11 months ago

The number of vlans allowed on a Cisco switch are generally higher than almost anyone except an ISP or massive company would ever need.

The cisco switches support vlan ID numbers 1-4094. The number you can actually USE is more limited, depending on the switch. The 3750 line should let you define 1024 actual vlans simultaneously on a switch.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps7077/prod_qas0900aecd805bbea5.html

Layer 2 Features

The  following section explains the Layer 2 features for the Cisco Catalyst  3750-E. They include Layer 2 forwarding, MAC learning, Spanning Tree  Protocol, and so on.

Q. How many EtherChannel groups are supported in a Cisco Catalyst 3750-E?

A. Forty Eight groups are supported, and each group can have up to 8 ports  with the same speed, duplex mode, native VLAN, VLAN range, trunking  status, and type.

Q. How many Spanning Tree Protocol instances are supported on the Cisco Catalyst 3750-E?

A. 128 Spanning-Tree Protocol instances, 1024 VLANS, 63 bridge groups and up to 4000 user-configurable VLAN IDs.

Q. Is Network Address Translation (NAT) supported?

A. No, there are no plans to support NAT.

Q. Is the full private VLAN feature supported?

A. Yes, it is supported in the IP Services feature set. In the IP Base  feature set the private VLAN edge (protected port) feature is supported.  In addition, the local proxy ARP feature is supported, and thus no  external router is required.

As far as interfaces go, you can trunk as many vlans as you have defined, and you can put them on any interface you want. You can choose on a per-port basis which vlans are access, voice, trunked, etc. The only real limitation is the number of switch ports you have, the range of allowable vlans (1-4000 essentially) and that you can only define about 1000 on the switch itself.

Odds are you'll never need anywhere near that many, since you can have 1000 vlans and only have 24 or 48 ports to put them in!

Andy

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Correct Answer
andymanc120 Thu, 05/03/2012 - 13:31

The number of vlans allowed on a Cisco switch are generally higher than almost anyone except an ISP or massive company would ever need.

The cisco switches support vlan ID numbers 1-4094. The number you can actually USE is more limited, depending on the switch. The 3750 line should let you define 1024 actual vlans simultaneously on a switch.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps7077/prod_qas0900aecd805bbea5.html

Layer 2 Features

The  following section explains the Layer 2 features for the Cisco Catalyst  3750-E. They include Layer 2 forwarding, MAC learning, Spanning Tree  Protocol, and so on.

Q. How many EtherChannel groups are supported in a Cisco Catalyst 3750-E?

A. Forty Eight groups are supported, and each group can have up to 8 ports  with the same speed, duplex mode, native VLAN, VLAN range, trunking  status, and type.

Q. How many Spanning Tree Protocol instances are supported on the Cisco Catalyst 3750-E?

A. 128 Spanning-Tree Protocol instances, 1024 VLANS, 63 bridge groups and up to 4000 user-configurable VLAN IDs.

Q. Is Network Address Translation (NAT) supported?

A. No, there are no plans to support NAT.

Q. Is the full private VLAN feature supported?

A. Yes, it is supported in the IP Services feature set. In the IP Base  feature set the private VLAN edge (protected port) feature is supported.  In addition, the local proxy ARP feature is supported, and thus no  external router is required.

As far as interfaces go, you can trunk as many vlans as you have defined, and you can put them on any interface you want. You can choose on a per-port basis which vlans are access, voice, trunked, etc. The only real limitation is the number of switch ports you have, the range of allowable vlans (1-4000 essentially) and that you can only define about 1000 on the switch itself.

Odds are you'll never need anywhere near that many, since you can have 1000 vlans and only have 24 or 48 ports to put them in!

Andy

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Posted May 3, 2012 at 7:08 AM
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