Cisco 2960/2960S Series Switches with LAN Base Software Datasheet

Cisco Catalyst 2960 and 2960S Series Switches are the leading Layer 2 edge, providing improved ease of use, highly secure business operations, improved sustainability, and a borderless network experience. The Catalyst 2960-S Series Switches include new FlexStack switch stacking capability with 1 and 10 Gigabit connectivity, and Power over Ethernet Plus (PoE+) with the Cisco Catalyst 2960 Series Switches offering Fast Ethernet access connectivity and PoE capabilities. Cisco 2960S and 2960 Series are fixed-configuration access switches designed for enterprise, midmarket, and branch office networks to provide lower total cost of ownership.

Cisco Catalyst 2960-S Series Switches with LAN Base Software have the following capabilities:

● 10 and 1 Gigabit Ethernet uplink flexibility with Small Form-Factor Pluggable Plus (SFP+), providing business continuity and fast transition to 10 Gigabit Ethernet

● 24 or 48 ports of Gigabit Ethernet desktop connectivity

● Cisco FlexStack stacking module with 20 Gbps of throughput, allowing ease of operation with single configuration and simplified switch upgrade

● PoE+ with up to 30W per port that allows you to support the latest PoE+ capable devices

● Power supply options, with 740W or 370W fixed power supplies for PoE+ switches are available

● USB storage for file backup, distribution, and simplified operations

● A wide range of software features to provide ease of operation, highly secure business operations, sustainability, and a borderless network experience

● Limited lifetime hardware warranty, including next-business-day replacement with 90-day service and support

Cisco Catalyst 2960 Series Switches with LAN Base Software have the following capabilities:

● Dual-purpose uplinks for Gigabit Ethernet uplink flexibility, allowing use of either a copper or fiber uplink; each dual-purpose uplink port has one 10/100/1000 Ethernet port and one SFP-based Gigabit Ethernet port, with one port active at a time

● 24 or 48 ports of Fast Ethernet desktop connectivity

● PoE configurations with up to 15.4W per port

● A wide range of software features to provide ease of operation, highly secure business operations, sustainability, and a borderless networking experience

● Limited lifetime hardware warranty

Configurations of Cisco Catalyst 2960-S Series Switches with LAN Base Software

Cisco Catalyst 2960-S Switch Model	Description	Uplinks	Available PoE Power
10 Gigabit Uplinks with 10/100/1000 Ethernet Connectivity
Cisco Catalyst 2960S-48FPD-L	48 Ethernet 10/100/1000 PoE+ ports	2 Ten Gigabit Ethernet SFP+ or 2 One Gigabit Ethernet SFP ports	740W
Cisco Catalyst 2960S-48LPD-L	48 Ethernet 10/100/1000 PoE+ ports	2 Ten Gigabit Ethernet SFP+ or 2 One Gigabit Ethernet SFP ports	370W
Cisco Catalyst 2960S-24PD-L	24 Ethernet 10/100/1000 PoE+ ports	2 Ten Gigabit Ethernet SFP+ or 2 One Gigabit Ethernet SFP ports	370W
Cisco Catalyst 2960S-48TD-L	48 Ethernet 10/100/1000 ports	2 Ten Gigabit Ethernet SFP+ or 2 One Gigabit Ethernet SFP ports	-
Cisco Catalyst 2960S-24TD-L	24 Ethernet 10/100/1000 ports	2 Ten Gigabit Ethernet SFP+ or 2 One Gigabit Ethernet SFP ports	-
1 Gigabit Uplinks with 10/100/100 Ethernet Connectivity
Cisco Catalyst 2960S-48FPS-L	48 Ethernet 10/100/1000 PoE+ ports	4 One Gigabit Ethernet SFP ports	740W
Cisco Catalyst 2960S-48LPS-L	48 Ethernet 10/100/1000 PoE+ ports	4 One Gigabit Ethernet SFP ports	370W
Cisco Catalyst 2960S-24PS-L	24 Ethernet 10/100/1000 PoE+ ports	4 One Gigabit Ethernet SFP ports	370W
Cisco Catalyst 2960S-48TS-L	48 Ethernet 10/100/1000 ports	4 One Gigabit Ethernet SFP ports	-
Cisco Catalyst 2960S-24TS-L	24 Ethernet 10/100/1000 ports	4 One Gigabit Ethernet SFP ports	-
Cisco Catalyst 2960S-STACK	Hot-swappable FlexStack stacking module	-	-
All models available with optional Cisco FlexStack stacking module. No DC power supplies are available.

Configurations of Cisco Catalyst 2960 Series Switches with LAN Base Software

Cisco Catalyst 2960 Switch Model	Description	Uplinks	Available PoE Power
1 Gigabit Uplinks with 10/100 Ethernet Connectivity
Cisco Catalyst 2960-48PST-L	48 Ethernet 10/100 PoE ports	2 One Gigabit Ethernet SFP ports and 2 fixed Ethernet 10/100/1000 ports	370W
Cisco Catalyst 2960-24PC-L	24 Ethernet 10/100 PoE ports	2 dual-purpose ports (10/100/1000 or SFP)	370W
Cisco Catalyst 2960-24LT-L	24 Ethernet 10/100 ports	2 Ethernet 10/100/1000 ports	123W
Cisco Catalyst 2960-24TC-L	24 Ethernet 10/100 ports	2 dual-purpose ports	-
Cisco Catalyst 2960-48TC-L	48 Ethernet 10/100 ports	2 dual-purpose ports (10/100/1000 or SFP)	-
Cisco Catalyst 2960-24TT-L	24 Ethernet 10/100 ports	2 Ethernet 10/100/1000 ports	-
Cisco Catalyst 2960-48TT-L	48 Ethernet 10/100 ports	2 Ethernet 10/100/1000 ports	-
1 Gigabit Uplinks with 10/100/1000 Ethernet Connectivity
Cisco Catalyst 2960G-24TC-L	24 Ethernet 10/100/1000 ports, 4 of which are dual-purpose (10/100/1000 or SFP)	4 dual-purpose ports (10/100/1000 or SFP)
Cisco Catalyst 2960G-48TC-L	48 Ethernet 10/100/1000 ports, 4 of which are dual-purpose (10/100/1000 or SFP)	4 dual-purpose ports (10/100/1000 or SFP)
Compact Switches
Cisco Catalyst 2960-8TC-L	8 Ethernet 10/100 ports; compact size with no fan	1 dual-purpose port (10/100/1000 or SFP)
Cisco Catalyst 2960PD-8TT-L	8 Ethernet 10/100 ports; compact size with no fan	1 10/100/1000 PoE input port
Cisco Catalyst 2960G-8TC-L	7 Ethernet 10/100/1000 ports; compact size with no fan	1 dual-purpose port (10/100/1000 or SFP)

As a world leading Cisco networking products supplier, 3Anetwork.com keeps stock for most 2960 and 2960-S LAN base switches. Among all Cisco Catalyst 2960 switches, WS-C2960-24TT-L and WS-C2960-24TC-L are best selling models. Among all Cisco Catalyst 2960S switches, WS-C2960S-24TS-L and WS-C2960S-48TS-L are best selling models. 3Anetwork.com offers best Cisco 2960 Price, Cisco 2960S (2960-S) Price, ship to worldwide.

More related topics:

Cisco 2960 VS Cisco 2960S Switches

Cisco Switch IOS versions 2960S

Cisco Catalyst 2960 Switch Getting Started Guide

VTP PRUNING: Troubleshoot L2 Connectivity Issue

VTP ensures that all switches in the VTP domain are aware of all VLANs. However, there are occasions when VTP can create unnecessary traffic. All unknown unicasts and broadcasts in a VLAN are flooded over the entire VLAN. All Cisco switches in the network receive all broadcasts, even in situations in which few users are connected in that VLAN. VTP pruning is a feature that you use in order to eliminate or prune this unnecessary traffic.

Broadcast traffic in a switched network without pruning

This figure shows a switched network without VTP pruning enabled. Port 1 on Switch A and Port 2 on Switch D are assigned to the Red VLAN. If a broadcast is sent from the host connected to Switch A, Switch A floods the broadcast and every switch in the network receives it, even though Switches C, E, and F have no ports in the Red VLAN.

Broadcast traffic in a switched network with pruning

This figure shows the same switched network with VTP pruning enabled. The broadcast traffic from Switch A is not forwarded to Switches C, E, and F because traffic for the Red VLAN has been pruned on the links shown (Port 5 on Switch B and Port 4 on Switch D).

When VTP pruning is enabled on a VTP server, pruning is enabled for the entire management domain. Making VLANs pruning-eligible or pruning-ineligible affects pruning eligibility for those VLANs on that trunk only (not on all switches in the VTP domain). VTP pruning takes effect several seconds after you enable it. VTP pruning does not prune traffic from VLANs that are pruning-ineligible. VLAN 1 and VLANs 1002 to 1005 are always pruning-ineligible; traffic from these VLANs cannot be pruned. Extended-range VLANs (VLAN IDs greater than 1005) are also pruning-ineligible.

The example:

In my experience in LAN Switching TAC, I have come across network connectivity problems that have taken a lot of time to solve. Symptoms observed are as follows

Intermittent connectivity to host connect to an access switch

One way audio in IP telephony

Default gateway cannot ping few hosts and when traffic is initiated from host, pings from the default gateway magically starts working and all other devices can ping these host

Clients connected to same access switch can ping each other but clients connected to an upstream switch cannot and so on.

Typical setup is as follows

CORE MLS(gi1/1)-----trunk------Access Switch----Clients

In most cases CORE Switch is the default gateway for the Clients.

Typical Troubleshooting is as follows

1)      Is the ARP complete ?

CORE#sh ip arp 10.10.1.144Protocol Address         Age (min) Hardware Addr   Type   InterfaceInternet 10.10.1.144           100   8cb6.4faa.8a41 ARPA   Vlan93

YES IT IS

2)  Is the switch learning mac address ?

CORE# sh mac-address-table address 8cb6.4faa.8a41 <NOT LEARNING MAC ADDRESS>

That should not cause connectivity loss as the packets will be flooded and will make its way to the clients

3)  Lets check the spanning tree status for vlan 93

CORE # show spanning-tree vlan 93<SNIP>Gigabitethernet 1/1 shows forwarding

Well, spanning tree status is forwarding – so my packets are supposed to leave interface Gi1/1

Lets SPAN interface Gi1/1 and see if packets are leaving – Result: SPAN Captures show no packets leave the interface.

Crazy !! so it is the CORE switch that is culprit – lets replace it ??

NO WAY -- Are we sure it is a hardware issue – No

What have we missed ? Hmm.. Lets add a static mac entry and see if that helps

CORE(config)# mac address-table static 8cb6.4faa.8a41 vlan 93 int gi1/1

CORE# ping 10.10.1.144

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.1.144, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

Lets remove the static mac address and now initiate traffic from end client –

mac address learned and everyone in the network can reach the client

From the troubleshhoting performed so far the observations made are as follows:

We intermittently lose connectivity to client. When traffic is initiated from client, we are immediately able to establish

connectivity to client and finally, we observe that the problem is seen when mac address of client ages out on the CORE switch

So what feature can block unicast flooding?

switchport block unicast command on the interface - not configured here

VTP pruning – Ah ha!!

Let us check if any vlan is pruned

CORE#show int gi1/1 trunk

Port          Mode         Encapsulation  Status        Native vlan

Gi1/1        on           802.1q         trunking      1

Port          Vlans allowed on trunk

Gi1/1        1-4094

Port          Vlans allowed and active in management domain

Gi1/1        1,10-18,20-30,32,60-61,90-103,111,138,155-156,201-203,400

Port          Vlans in spanning tree forwarding state and not pruned

Gi1/1        1,10,22

Also check

CORE#show int gi1/1 pruning

Port      Vlans pruned for lack of request by neighbor

Gi1/1    11-18,20-21,23-30,32,60-61,90-103,111,138,155-156,201-203,400 

-> All these VLAN’s are pruned because neighbor did not request for them

Port      Vlan traffic requested of neighbor

Gi1/1    1,10-18,20-30,32,60-61,90-103,111,138,155-156,201-203,400 

-> This is what CORE Switch is requesting from its neighbor switch

So VTP pruning was the culprit – As the mac address of end client aged out, the switch would have to unicast flood the packet to all ports on

VLAN 93, which is not sent on Gi1/1 as VLAN 93 was pruned.

Once VTP pruning is turned off – All connectivity issues are corrected.

When can such a scenario occur ?

1)  In environment which has switches in VTP server/client mode along with switch that maybe in VTP transparent mode

2)  When a non Cisco switch that does not understand VTP is connected to a Cisco Switch which has VTP turned ON (in most cases)

So please keep in mind that VTP pruning can be the cause of connectivity issues.

In an all Cisco environment where all switches are configured to be in VTP server or client mode, you can turn ON VTP pruning as this will help limit unnecessary flooding in the network and is of great help.

After all, VTP pruning need not be a PIA.

It is referred from: https://supportforums.cisco.com/blog/150491/troubleshoot-l2-connectivity-issue-vtp-pruning

More about the Cisco configuration, please visit: http://www.3anetwork.com/blog