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Any STP configuration changes you make on your switches are effected immediately, which means that layer 2 will have to re-converge, causing a brief disruption in your layer 2 network 1402 The CD contains a multimedia demonstration of configuring an optimized PVRST+ topology
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EXERCISE 14-1 Examining STP Information on Your Switches
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The last few sections dealt with the operation of STP This lab builds upon this information and allows you to view STP in operation on switches You can find a picture of the network diagram for the simulator in the Introduction of this book After starting up Boson s NetSim simulator, click the LabNavigator button Next, double-click Exercise 14-1 and click the Load Lab button This will load the lab configuration based on 12 1 From the 2950-1, verify that you can ping the Host-1 PC and the 2950-2 switch At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-1 Access the CLI of the 2950-1 Execute ping 192168110 and ping 19216813 Both should be successful 2 From Privilege EXEC mode, view the STP operation for VLAN 1: show spanning-tree vlan 1 3 Compare the root ID and bridge ID at the top of the display: if they are the same, then this is the root switch, which means interfaces fa0/1 and fa0/2 (connected to 2950-2) should be in a forwarding state If the IDs are different, then this is not the root switch and fa0/2 should be in a blocking state (BLK) 4 At the top of the simulator in the menu bar, click the eSwitches icon and choose 2950-2 Access the CLI of the 2950-2 From the 2950-2, view the STP operation for VLAN 1 5 From Privilege EXEC mode, view the STP operation for VLAN 1: show spanning-tree vlan 1 Examine the IDs and the fa0/1 and fa0/2 interfaces, as described in step 3 Now you should be more comfortable with STP on your Catalyst IOS switches
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14: Switches and Redundancy
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It is common to need higher bandwidth speeds for certain kinds of connections in your network, such as connections from the access layer to the distribution layer, between distribution layer switches, between distribution and core layer switches, and between certain servers or routers and their connected switches For example, in Figures 14-1 and 14-14 you can see dual layer 2 connections between the two distribution layer switches as well as between the distribution and core layer switches The problem with this type of design, however, is that it creates layer 2 loops; and with STP running, STP will ensure that only one path is active between two devices, limiting you to the bandwidth of one of possibly multiple connections
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EtherChannel Overview
An EtherChannel is a layer 2 solution that allows you to aggregate multiple layer 2 Ethernet-based connections between directly connected devices Basically, an EtherChannel bundles together multiple Ethernet ports between devices, providing what appears to be single logical interface From STP s perspective, it sees the EtherChannel as a single logical connection between the connected devices, which means that you can actually use all of the individual connections, simultaneously, in the channel you ve created EtherChannels provide these advantages:
Redundancy
If one connection in the channel fails, you can use other connections in the channel Each connection can be used simultaneously to send frames Configuration is done on the logical interface, not on each individual connection in the channel
More bandwidth
Simplified management
EtherChannel Restrictions
Interfaces in an EtherChannel must be configured identically: speed, duplexing, and VLAN settings (in the same VLAN if they are access ports, or the same
EtherChannels
trunk properties) must be the same When setting up EtherChannels, you can use up to eight interfaces bundled together:
Up to eight Fast Ethernet connections, providing up to 800 Mbps Up to eight Gigabit Ethernet connections, providing up to 8 Gbps Up to eight 10-Gigabit Ethernet connections, providing up to 80 Gbps
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