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This chapter describes how to configure EtherChannel for the Catalyst 2948G-L3 switch router. For additional information about the Cisco IOS commands used in this chapter, refer to the Cisco IOS Command Reference publication. This chapter includes the following sections.
This section describes how to configure Fast EtherChannel (FEC) or Gigabit EtherChannel (GEC) in Layer 3 switching. EtherChannel is a trunking technology that groups together multiple full-duplex 802.3 Ethernet interfaces to provide fault-tolerant high-speed links between switches, routers, and servers. EtherChannel is a logical aggregation of multiple Ethernet interfaces. EtherChannel forms a single higher bandwidth routing or bridging endpoint. EtherChannel is designed primarily for host-to-switch connectivity or Inter-Switch Link (ISL) switch-to-switch connectivity (for example, connectivity to a Catalyst 5500 switch).
EtherChannel provides the following benefits:
The Catalyst 2948G-L3 switch router supports Fast EtherChannel (FEC) and Gigabit EtherChannel (GEC).
The Cisco Fast EtherChannel technology builds upon standards-based 802.3 full-duplex
Fast Ethernet to provide a reliable high-speed solution for the campus network backbone. Fast EtherChannel provides bandwidth scalability within the campus by providing up to 800 Mbps full-duplex Fast Ethernet.
Step 1 Create an EtherChannel interface (port channel) and assign a network (IP or IPX) address.
Step 2 Assign up to four Fast Ethernet or up to two Gigabit Ethernet interfaces to the port channel.
| Step | Command | Purpose |
|---|---|---|
| 1 | | Creates the EtherChannel interface. You can configure up to 16 FECs and 1 GEC. |
| 2 | | Assigns an IP address and subnet mask to the Fast EtherChannel interface. |
| 3 | | Exits this mode. Optionally, you can remain in interface configuration mode and enable other supported interface commands to meet your requirements. |
For information on other configuration tasks for the EtherChannel, refer to the Cisco IOS Configuration Fundamentals Configuration Guide.
To assign Ethernet interfaces to the EtherChannel, use the following steps beginning in global configuration mode.
| Step | Command | Purpose |
|---|---|---|
| 1 | or | Enters Ethernet interface configuration mode to configure the Fast Ethernet or Gigabit Ethernet interface you want to assign to the EtherChannel. You can assign any interface on the system to the EtherChannel. |
| 2 | | Disables the IP address. If the Fast Ethernet or Gigabit Ethernet interface already exists and has an IP address assigned, you must disable the IP address before performing the next step. The Ethernet interface uses the IP address assigned to the EtherChannel interface. |
| 3 | | |
| 4 | | Exits interface configuration mode. Repeat Steps 1 through 4 to add up to four |
| 5 | | Saves configuration changes to NVRAM. |
To remove an IP address and subnet mask from the EtherChannel interface, use the following steps beginning in global configuration mode.
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enters interface configuration mode for the port channel. |
| 2 | | Removes an IP address and subnet mask assigned to the Fast EtherChannel interface. For IPX, use the no ipx network network-number command. |
| 3 | | Exits this mode. |
To remove Ethernet interfaces assigned to the EtherChannel, use the following steps beginning in global configuration mode.
| Step | Command | Purpose | ||
|---|---|---|---|---|
| or | Enters interface configuration mode to remove the Fast Ethernet or Gigabit Ethernet interface you want to remove from the EtherChannel. You can remove any interface you had assigned to the EtherChannel. | ||
| | |||
| | Exits interface configuration mode. Repeat Steps 1 through 3 to remove any other interfaces from the EtherChannel. | ||
| | Saves configuration changes to NVRAM. |
The Cisco IOS software automatically removes a Fast Ethernet or Gigabit Ethernet interface from the EtherChannel if the interface goes down, and the software automatically adds the interface to the EtherChannel when the interface is back up.
To configure encapsulation over the EtherChannel, use the following steps beginning in global configuration mode.
| Step | Command | Purpose | ||
|---|---|---|---|---|
| | Creates the EtherChannel (or port channel) virtual interface. | ||
| | Exits to enter global configuration mode. | ||
| or | Enters interface configuration mode for the interface you are adding to the port channel. | ||
| | Adds the interface to the port channel. You can add up to four Fast Ethernet or two Gigabit Ethernet interfaces to the EtherChannel. | ||
| | Exits to enter global configuration mode. | ||
| | Configures the subinterface on the port channel. | ||
| | Assigns the ISL encapsulation to the subinterface. | ||
| | Assigns the protocol IP address and subnet mask to the subinterface. | ||
| | Exits this mode. Optionally, you can remain in interface configuration mode and enable other supported interface commands to meet your requirements. | ||
| | Saves configuration changes to NVRAM. |
Once Fast EtherChannel or Gigabit EtherChannel is configured, you can monitor its status using the show interfaces port-channel command.
In addition, you have the option of configuring system management tasks to monitor and fine tune your switch router's performance. For these tasks, see the Cisco IOS command reference documentation.
Posted: Fri Apr 14 09:48:38 PDT 2000
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