Do not assume a component works, you must check it first. Then you turn the channel for ports 2/1-4 on. You saved about 5 seconds when you change the trunking mode fromautotooff. In later Catalyst operating system software (5.
Lab 7-3 Testing Mode Connect A Computer To A Network Cable
Perform these steps: The show port capabilities 1/1 command displays the capabilities of an Ethernet 10/100BaseTX 1/1 port on Switch A. The switch does not actually route; it rewrites the frames so that it appears to the end devices that they talk through the router. Sets found in the same folder. In order to verify that Portfast is enabled, do this command: 2900XL#show spanning-tree interface fastEthernet 0/1. Here are some general suggestions: Take the time to become familiar with normal switch operation. This permits MLSP multicasts to move between the MLS-RP and MLS-SE and allows MLS to function. Before you connect the cables, this is the port status. This is the command. For MLS to function, include on the MLS-SE the MLS-ID found on the MLS-RP. Lab 7-3 testing mode connect a computer to a network cable. Sometimes ports are damaged by Electro-Static Discharge (ESD).
The suggestions are relatively easy to implement and are very often the cause of workstation connectivity problems encountered through the workstation initialization/startup phase. The switch continually learns as frames are received into the switch. This is why SwitchB reports that there is a spanning tree loop. Trunking is a mechanism that is most often used to allow multiple VLANs to function independently across multiple switches. Show clock- to see the current time (for the timing tests). Cluster member switch capable. The MLS-RP sends out multicast 'hello' packets every 15 seconds with MLSP; if three of these intervals are missed, then the MLS-SE recognizes that the MLS-RP has failed or that connectivity to it has been lost. In other words, the port can take at least 30 seconds to move to the forwarding state whenever it initializes. Lab 7-3: testing mode: connect a computer to a network using. Switch ports that can run PAgP usually default to a passive mode called "auto" which means that they can form a bundle if the neighbor device across the link asks them to. Sometimes when you try to configure EtherChannel, but the ports are not configured the same, it causes the ports on one side of the channel or the other to be shut down. Since this must never happen, BPDU-Guard puts the port into "errDisable" state. You can confirm it two ways. The version of the switch software used in this document is 4.
Lab 7-3: Testing Mode: Connect A Computer To A Network Using
Here is the output when you enter the set port speed 1/1 10 command on Switch B: Switch-B> (enable) set port speed 1/1 10. Turning PAgP fromautotooffin this test saved about 12 seconds. 0 Model: WS-C5505 Serial #: 066507453. Spantree start-forwarding. Mismatched Parameters.
Confusion can arise here, since it seems that a layer-two device takes on a layer-three task; actually, the switch is only rewriting layer-three information, and is switching between subnets/VLANs--the router is still responsible for standards-based route calculations and best-path determination. This eliminates any potential negotiation issues and ensures that you always know exactly how the ports need to operate. On certain modules (WS-X5201 and WS-X5203), you cannot form an EtherChannel with the last two ports in a "port group" unless the first two ports in the group already form an EtherChannel. Normally the spanning tree protocol (STP) considers these redundant links between two devices to be loops and sets the redundant links to the blocking mode. Turn the devices off and back on again. The third major component of MLS is the Multilayer Switching Protocol (MLSP). Try different interfaces. Switches have become much more complex over the last few years because they have gained in popularity and sophistication. There can be incompatibilities in the implementation of these features if the switches that are connected are from different vendors. CS: Lab 7-3: Testing Mode: Connect a Computer to a Network. If the port is changed to a trunking mode of "off" it further reduces the delay of a switch port that becomes active.
Lab 7-3: Testing Mode: Connect A Computer To A Network Pc
This section goes through an examination of the behavior of a 10/100Mb Ethernet port that supports auto-negotiation. Another way to view the Portfast settings for one or more ports is to view the spanning tree information for a specific VLAN. Remember, the point of MLS is to allow the communication path between two devices in different VLANs, connected off of the same switch, to bypass the router, and enhance network performance. Any configuration modifications are lost if the router reloads or is reset. This makes it clear that you must check both sides of the channel when you manually configure the channel to make sure that both sides are up, not just one side. Lab 7-3: testing mode: connect a computer to a network pc. General spanning tree: Then, you shut down the port in question. When trunking is turned on, the port can carry traffic for many VLANs. Timing Test on the Catalyst 2820. A non-functional link is usually easier to discover than a link, which is operational, but does not operate at the expected speed or mode.
Configuration errors usually occur because of mismatched parameters on the ports involved (different speeds, different duplex, different spanning tree port values, and so on). No longer supports Internet Explorer. If your network only has one VLAN in it, you do not necessarily need trunking; but if your network has more than one VLAN, you probably want to take advantage of the benefits of trunking. Port 1/1 on Switch B is still configured to auto negotiate, as shown in this output of the show port 1/1 command. Now the set port duplex 1/1 half command on Switch B works: The show port 1/1 command on Switch B shows that the ports is now configured for half-duplex and 10Mb.
With the various features that are now included in some switches, it can take close to a minute for a switch to begin to service a newly connected workstation. C] Path cost (spanning tree) 10. The rest of the ports are significant, as well, because they connect the actual users of the network. 2 24 10/100BaseTX Ethernet WS-X5225R 012785227 ok. Mod MAC-Address(es) Hw Fw Sw. --- -------------------------------------- ------ ---------- -----------------. From listening to learning took approximately 14 seconds (20:39 to 20:53). When a packet transverses a routed interface, non-data portions of the packet are changed (rewritten) as it is carried to its destination, hop by hop. Now you turn the PAgP mode to "off. "