Building configuration... Current configuration:! In order to avoid this situation when you configure EtherChannel manually, you disable the ports on SwitchA, configure the channel on SwitchA, configure the channel on SwitchB, and then re-enable the ports on SwitchA. Still, this is a reasonably limited area to search. Lab 7-3: testing mode: connect a computer to a network with 2. This usually applies to IP packets but now also can occur for IPX packets. A switch can physically replace a hub in your network.
The default gateway was not used. Use theset port speed mod_num/port_num autocommand on a Catalyst to configure auto-negotiation. One way to do this is to use the OSI seven-layer model. Status: In Progress. There are different types of trunking protocols. This is a required configuration step when you use external MLS-RPs. CS: Lab 7-3: Testing Mode: Connect a Computer to a Network. Speed auto, 10, 100. Understand the Spanning Tree messages. It can be necessary to disable/enable IP MLS, as well. The configuration guides in particular are very helpful. The IP routing is enabled on the MLS-RP (it is on by default): if the commandno ip routingappears in the global configuration of ashow run, it has been turned off, and IP MLS does not function. 1d STP State: Blocking Forward Transitions: 0. Commands Used in this Section.
Since this must never happen, BPDU-Guard puts the port into "errDisable" state. These are the steps to manually configure the EtherChannel. Not every Fast Ethernet module supports EtherChannel. Lab 7-3: testing mode: connect a computer to a network with usb. Normally, spanning tree would block all of these parallel connections between devices because they are loops, but EtherChannel runs underneath spanning tree, so that spanning tree thinks all the ports within a given EtherChannel are only a single port. These are the timing tests on the Catalyst 2900XL. 00:23:45:%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Internal MLS-RPs (once again, the RSM or RSFC in a Catalyst 5xxx family member, and the MSFC in a Catalyst 6xxx family member) are automatically recognized by the MLS-SE in which they are installed. Port Name Status Vlan Level Duplex Speed Type.
You see similar amounts of traffic on each of the ports in the channel if that traffic is generated by a normal distribution of MAC addresses on one side of the channel or the other. If you come in to work one day and see hundreds of orange lights, do not panic; it could be that all the ports belonged to the same VLAN and someone accidentally deleted the VLAN that the ports belonged to. If you have a large amount of alignment errors, FCS errors, or late collisions, this can indicate a duplex mismatch on the wire. For MLS to function, the switch must recognize the router as an MLS-RP. MLSP also allows the MLS-SE to learn the Media Access Control (MAC, layer-two) addresses of the MLS-enabled router interfaces, check the flowmask of the MLS-RP (explained later in this document), and confirm that the MLS-RP is operational. The changes to the configuration are automatically saved to NVRAM. Are there any features configured on the MLS-RP that automatically disable MLS on that interface? The Cisco web site has a tremendous amount of technical information that describes how their switches work, as mentioned in the previous section. Port 1/1 is in auto-sensing mode. Recent flashcard sets. Lab 7-3: testing mode: connect a computer to a network marketing. Server facility: LOCAL7. Show module- to display which modules are installed in the switch.
Auto-negotiation not supported. The protocol used to communicate with the routers is called Multilayer Switching Protocol (MLSP). The sections in this chapter describe common LAN switch features and solutions to some of the most common LAN switching problems. They also add extra connectors that can cause problems and are another component to debug. Sometimes ports are damaged by Electro-Static Discharge (ESD). In order to demonstrate what happens when the duplex mode has been configured, the mode on port 1/1 in Switch A is set to half with the set port duplex 1/1 half command. This eliminates any potential negotiation issues and ensures that you always know exactly how the ports need to operate. Some of these configuration guides can be read in an afternoon and are well worth the time spent. In order to re-establish your connection, open and close the AppleTalk control panel. " The mismatch was caused by the 1/1 port of Switch B, which default to half-duplex because it sensed its Link Partner could no longer perform auto-negotiation. When you enter the set port speed 1/1 10 command caused the duplex mode on port 1/1 to be configured as if the command set port duplex 1/1 full had also been entered. 2900XL#copy run start.
If seen infrequently, or just a few times in a row, there is no cause for concern; MLS is a robust feature, and the message can be simply caused by normal network events, like a PC connection moved between ports, for example. The switch makes sure that traffic from one group of ports never gets sent to other groups of ports (which would be routing). This super great great great great great great great great great great great great great great!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! For most MLS-RPs (routers configured for IP MLS), this statement must appear both in the global configuration and under the interface configuration. 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. All of these tests are done on a Catalyst 5000 with a 10/100 Fast Ethernet card that supports DTP and PAgP. Additionally, document the results so that Cisco can better assist you: Capture the output ofshow versionfrom all of the affected devices. There can be complications, though, if you turn off auto-negotiation on the switch but leave it active on the workstation. The trunk mode was set to desirable. As greater demands are placed on networks, the need for greater performance increases. Thank you tits mccoy for saying what we were all thinking.
The 2900XL and 3500XL models can be configured from a web browser, or by SNMP, or by the command line interface (CLI). 3u Fast Ethernet standard that enables devices to automatically exchange information over a link about speed and duplex abilities. The suggestions are relatively easy to implement and are very often the cause of workstation connectivity problems encountered through the workstation initialization/startup phase. Start the test with trunking set to off (instead of auto). With PAgP set in desirable mode on each side, the channel stabilizes and renegotiates the EtherChannel connection. Ping- to test connectivity to the other switch. It can also refer to devices with multiple NIC cards where the NIC card is only used for redundancy, in other words the workstation or server is not configured to act as a bridge, it just has multiple NIC cards for redundancy. Some problems and solutions are obvious; some are not. Logging history size: 1. 3 auto-negotiation protocol. Designated bridge has priority 32768, address 40. First, verify that channeling isoff. Spanning-tree portfast!
This is the point of the MLS feature. Note: When the portfast is turned on it is not the same thing as turning spanning tree off (as noted in the document). Verify that EtherChannel is supported on the ports. Set the duplex mode and speed of port 1/1 on Switch B. Because of this possibility, it is much easier to create EtherChannels with PAgP, which is explained later in this document. In order to verify that Trunking negotiation is off, use theset trunk offcommand. The combination desirable/negotiate causes SwitchA to ask SwitchB to trunk and to negotiate the type of trunking to do (ISL or 802. If it says "no spantree start-forwarding" in the configuration, Portfast is disabled. Bridge ID MAC ADDR 00-90-92-b0-84-00.
Designated Root Port 2/24. You must turn off channeling for at least a group of two ports. Here are the basic rules that a switch uses to carry out the frame forwarding responsibility: If the destination MAC address is found in the CAM table, the switch sends the frame out the port that is associated with that destination MAC address in the CAM table. Show spanning-tree interface FastEthernet 0/1- to see if Portfast is enabled on this port (no mention of Portfast means that it is not enabled). It goes on to show how users can control the behavior, as well as explain situations when auto-negotiation fails.
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