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Configuring LAN Interfaces
Use the information in this chapter to configure LAN interfaces supported on Cisco routers and access
servers.
This chapter describes the processes for configuring LAN interfaces in the following sections:
• Configuring an Ethernet or Fast Ethernet Interface
� Configuring Fast EtherChannel
� Configuring a Fiber Distributed Data Interface
� Configuring a Hub Interface
� Configuring a LAN Extender Interface
� Configuring a Token Ring Interface
For examples of configu
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface With the Catalyst 3000 or Catalyst 5000 system, the Fast Ethernet processor can be used to aggregate up to twelve 10-Mbps LANs and give them high-speed access to such Layer 3 routing services as providing firewalls and maintaining access lists. Cisco 7200 series routers support an I/O controller with an RJ-45 interface. You can configure the optional Fast Ethernet port for use at 100-Mbps full-duplex or half-dupl
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface Specifying an Ethernet or Fast Ethernet Interface To specify an Ethernet interface and enter interface configuration mode, use one of the following commands in global configuration mode: Command Purpose interface ethernet number Begins interface configuration. interface ethernet slot/port Begins interface configuration for the Cisco 7200 and Cisco 7500 series routers. interface ethernet Begins interface configurat
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface Specifying Full-Duplex Operation The default is half-duplex mode on the FEIP2-DSW-2FX. To enable full-duplex mode on the FEIP2-DSW-2FX (for a maximum aggregate bandwidth of 200 Mbps), use either of the following commands in interface configuration mode: Command Purpose full-duplex Enables full-duplex on the Fast Ethernet interface of the FEIP2-DSW-2FX. or no half-duplex For an example to enable full-duplex mode on
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface Extending the 10BASE-T Capability On a Cisco 4000 series or Cisco 4500 series routers, you can extend the twisted-pair 10BASE-T capability beyond the standard 100 meters by reducing the squelch (signal cutoff time). This feature applies only to the LANCE controller 10BASE-T interfaces. LANCE is the AMD controller chip for the Cisco 4000 and Cisco 4500 Ethernet interface. Note Does not apply to the Fast Ethernet in
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface Table 3 Relationship Between Duplex and Speed Command Options Duplex Command Speed Command Resulting System Actions duplex auto speed auto Autonegotiates both speed and duplex modes. duplex auto speed 100 or speed 10 Autonegotiates both speed and duplex modes. duplex half speed auto Autonegotiates both speed and duplex modes. or duplex full duplex half speed 10 Forces 10 Mbps and half duplex. duplex full speed 10
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface Note If you use the full-duplex and the half-duplex commands to change the transmission mode of the first two PA-12E/2FE interfaces (port 0 and port 1), the transmission speed of the two PA-12E/2FE interfaces automatically defaults to 100-Mbps. The first two PA-12E/2FE interfaces only operate at 10-Mbps when the interfaces are autosensing and autonegotiating the proper connection speed (10-Mbps or 100-Mbps) with
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface To configure the interfaces on the PA-12E/2FE port adapter, use the following commands in global configuration mode: Command Purpose bridge bridge-group protocol ieee Step 1 Specifies the type of Spanning-Tree Protocol. The PA-12E/2FE port adapter supports DEC and IEEE Spanning-Tree Protocols; however, we recommend using the IEEE protocol when configuring bridge groups. Step 2 interface fastethernet slot/port Ent
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface Monitoring and Maintaining the PA-12E/2FE Port Adapter After configuring the new interface, you can display its status and verify other information. To display information about the PA-12E/2FE port adapter, use the following commands in EXEC mode: Command Purpose show version Displays the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot image. sh
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Configuring LAN Interfaces Configuring an Ethernet or Fast Ethernet Interface You can access the 12E/2FE VLAN Configuration WebTool from your router’s home page. For complete procedures on how to use the VLAN Configuration WebTool, refer to the PA-12E/2FE Ethernet Switch Port Adapter book that accompanies the hardware. Figure 2 Example Home Page for a Cisco 7200 Series Router (Cisco 7206 Shown) All Cisco routers running Cisco IOS Release 11.0 or later have a home page. All Cisco router home
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Configuring LAN Interfaces Configuring Fast EtherChannel Configuring the 100VG-AnyLAN Port Adapter The 100VG-AnyLAN port adapter (PA-100VG) is available on Cisco 7200 series routers and on Cisco 7500 series routers. The PA-100VG provides a single interface compatible with and specified by IEEE 802.12 to support 100 Mbps over Category 3 or Category 5 unshielded twisted-pair (UTP) cable with RJ-45 terminators. The PA-100VG supports 802.3 Ethernet packets and can be monitored with the IEEE 8
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Configuring LAN Interfaces Configuring Fast EtherChannel links. Unicast, broadcast, and multicast traffic is distributed across the links providing higher performance and redundant parallel paths. In the event of a link failure, traffic is redirected to remaining links within the Fast EtherChannel without user intervention. In this release of the Fast EtherChannel feature, IP traffic is distributed over the port-channel interface while traffic from other routing protocols is sent over a sin
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Configuring LAN Interfaces Configuring Fast EtherChannel Configuring the Port-Channel Interface To configure the port-channel interface, use the following commands beginning in global configuration mode: Command Purpose interface port-channel Step 1 Creates the port-channel interface and enters interface configuration mode. The channel-number channel number can be 1 to 4. Step 2 ip address ip-address mask Assigns an IP address and subnet mask to the Fast EtherChannel. If you configure ISL,
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Configuring LAN Interfaces Configuring Fast EtherChannel Configuring the Fast Ethernet Interfaces To assign the Fast Ethernet interfaces to the Fast EtherChannel, use the following commands beginning in global configuration mode: Command Purpose interface fastethernet Step 1 Creates or modifies an existing Fast Ethernet interface and enters interface slot/port-adapter/port configuration mode. Step 2 no ip address Disables the IP address before performing the next step, if the Fast Ethernet
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Configuring LAN Interfaces Configuring a Fiber Distributed Data Interface EtherChannel even if the line protocol goes down. This can result in unpredictable behavior. The implementation of the Port Aggregation Protocol in a subsequent release of this feature will remove the dependency on keepalives. See the “LAN Interface Configuration Examples” section for configuration examples. You can monitor the status of the Fast EtherChannel interface by using the show interfaces port-channel EXEC co
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Configuring LAN Interfaces Configuring a Fiber Distributed Data Interface The scatter-gather architecture used by particle-based switching provides the following advantages: � Allows drivers to use memory more efficiently (especially when using media that has a large maximum transmission unit [MTU]). For example, Token Ring buffers could be 512 bytes rather than 16 KB. � Allows concurrent use of the same region of memory. For example, on IP multicast a single packet is received and sent out
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Configuring LAN Interfaces Configuring a Fiber Distributed Data Interface The CFM state is through A in the sample output, which means this interface’s Phy-A has successfully completed CMT with the Phy-B of the neighbor and Phy-B of this interface has successfully completed CMT with the Phy-A of the neighbor. The display (or nondisplay) of the upstream and downstream neighbor does not affect the ability to route data. Since the upstream neighbor is also its downstream neighbor in the sample
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Configuring LAN Interfaces Configuring a Fiber Distributed Data Interface Enabling FDDI Bridging Encapsulation Cisco FDDI by default uses the SNAP encapsulation format defined in RFC 1042. It is not necessary to define an encapsulation method for this interface when using the FIP. FIP fully supports transparent and translational bridging for the following configurations: � FDDI-to-FDDI � FDDI-to-Ethernet � FDDI-to-Token Ring Enabling FDDI bridging encapsulation places the FIP into encapsulati
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Configuring LAN Interfaces Configuring a Fiber Distributed Data Interface Setting the Token Rotation Time You can set the FDDI token rotation time to control ring scheduling during normal operation and to detect and recover from serious ring error situations. To do so, use the following command in interface configuration mode: Command Purpose fddi token-rotation-time microseconds Sets the FDDI token rotation time. The FDDI standard restricts the allowed time to be greater than 4000 microseco
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Configuring LAN Interfaces Configuring a Fiber Distributed Data Interface Modifying the TB-Min Timer You can change the TB-Min timer in the PCM from its default value of 100 ms. To do so, use the following command in interface configuration mode: Command Purpose fddi tb-min milliseconds Sets TB-Min timer in the PCM. Modifying the FDDI Timeout Timer You can change the FDDI timeout timer in the PCM from its default value of 100 ms. To do so, use the following command in interface configuration
