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Various models of Cisco Catalyst 4948 switch : Layer 3 ,  trunking , link aggregation & ACL support

Medium Priority
Last Modified: 2012-05-06
Are there several models of the Catalyst 4948 ?  

I'll need a 48 port gigabit Cisco switch that

a) provide Layer 3 support (so that I can define ACLs to filter traffic between
    our DMZ and other backend/production subnets

b)scalable : I need 90 ports currently but there could be plans for expansion, thus
   more ports will be needed in future.  Can I just trunk 2 or 3 or more of the 4948
   switches together (using 2xRJ45 ports) to scale them for more ports.  Is there
   a limit as to how many of the switches that could be trunked together?
   I usually hear that Fibre channel ports are used to trunk two switches together,
   is there any shortcoming of trunking two switches using RJ45 LAN Cat 6 cables?

c)Some of our VMWare blade servers may need a total aggregate of 2 or 3 Gbps
   bandwidth : which of the 4948 models support this link aggregation (802.?) ie
   we connect up 2 NIC ports on a server to the switches' port to get a bigger
   aggregate bandwidth throughput

d)Lastly someone ever told me it's possible to assign an IP address to a Layer 2
   switch's port by creating a VLAN, assign the VLAN to a Layer 2 switch port
   & then assign an IP addr to that VLAN : let me know the exact commands (step
   by step)  on  how to go about setting this up

Watch Question

Yes there are different models of 4948 but they only relate to the image that is loaded and other options, not to the number of ports. You can use any variety of Cisco switches to accomplish what you are talking about, is there a reason for the 4948? 3560G and 3750G both have the same throughput and there are -E versions with 10Gig uplinks that you could use between switches. You could alos look at a blade based solution such as the 4500 series or 6500 series based on rate of expansion. If you are planning to add a significant amout of switches, you may want to consider doing a 2 layer model and incorporate a distribution layer. In order to set up a VLAN and then assign switchports do the following from configuration mode on the switch.

Create the VLAN (substitute vlan # and ip with yours)

vlan 10
ip address
no shut

Assign Interface to VLAN (substitute vlan # and interface with yours) Repeat as necessary.

interface f0/1
switchport mode access
switchport access vlan 10
no shut

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Thanks very much.

Are the 3750G and 3650G models layer 3 switches?  I need to be able to create
ACL and possibly do some routing

Can the 3750g and 3650g support the following (link aggregation) :
c)..... link aggregation (802.?) ie  we connect up 2 NIC ports on a server to the switches'
   port to get a bigger aggregate bandwidth throughput

are the two models you suggested of lower cost than the 4948?

I'm only looking at single U models and not the chassis type as our rack is short of
space or mounting

Lastly, can I get one of the 4948 and then get two of the 3xxx models suggested to
trunk them together (to enjoy the 10Gbps uplink) and possibly the 3xxx is cheaper
(enjoy the cost benefits)   as 4948 is true Layer 3?


Also, what's the differences between the images : what extra functionalities
the better images provide, if you can quote a few as I need to determine the
exact model that we need to get.

Thanks v much
All three are Layer 3,  the 3750 and 3560 both support at least 802.3ad link aggregation like the 4948. Both the 3560 and 3750 have a fixed configuration though and only one power supply. the 4948 has two modular power supplies but costs about double. If you are looking for 10Gig uplinks, you will want the 3560-E version or 3750-E as the G version is just all Gigabit ports. You will still want the X2 modules for any of the 3 to do 10Gig. Any of these can be trunked together. Any of the three will do any of the routing protocols like OSPF or EIGRP based on the image you have loaded.



So if I get the 3560-E  or 3750-E, it's all 48 port gigabit ports only
and to get the 10Gbps uplink,  will still need to get the X2 modules,
is this right?  Is this 10Gbps uplink fibre port or just the plain Cat 6
RJ45 cable?
You are correct. They have not released an X2 module that is straight cat6, only the proprietary copper good for 15m or fiber options. They are starting the cat6 modules with the SFP form factor for the Nexus line.
In addition, if you don't need all 48 ports, they make a 24 port model of each.
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