Cisco WS-C4003 Software Guide - Page 82
Default EtherChannel Configuration, Hardware Support for EtherChannel, EtherChannel Configuration
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Default EtherChannel Configuration Chapter 6 Configuring Fast EtherChannel and Gigabit EtherChannel Default EtherChannel Configuration Table 6-2 shows the Fast EtherChannel and Gigabit EtherChannel default configuration. Table 6-2 Fast EtherChannel and Gigabit EtherChannel Default Configuration Feature Fast EtherChannel Gigabit EtherChannel Frame-distribution method Default Value auto silent mode on all Fast Ethernet ports auto silent mode on all Fast Ethernet ports Source and destination MAC Hardware Support for EtherChannel EtherChannel support is hardware-dependent. In general, you can use the show port capabilities command to determine whether your hardware supports EtherChannel, and to confirm which ports you can bundle into a single EtherChannel. An EtherChannel bundle can consist of any two to eight ports. Ports in an EtherChannel bundle do not have to be continuous, and they do not have to be on the same module. Due to the port ID handling by the spanning tree feature, the maximum supported number of channels is 126 for a 6-slot chassis. EtherChannel Configuration Guidelines and Restrictions If improperly configured, some EtherChannel ports are disabled automatically to avoid network loops and other problems. Use the following guidelines to avoid configuration problems: • Assign all ports in an EtherChannel to the same VLAN, or configure them as trunk ports. • If you configure the EtherChannel as a trunk, configure the same trunk mode on all the ports in the EtherChannel, on both ends of the link. Configuring ports in an EtherChannel in different trunk modes can have unexpected results. • Configure all ports in an EtherChannel to operate at the same speed and duplex mode (full or half duplex). • If the EtherChannel is composed of trunk ports, you must configure the same allowed VLAN range on all the ports. When the allowed VLAN range is not the same for all trunks in a channel, trunk ports on which a particular VLAN is not allowed will drop the packets for that VLAN while ports on which the VLAN is allowed will transmit the traffic. If the allowed VLAN range is not the same on all ports in the channel, the ports do not form a channel when set to the auto or desirable mode with the set port channel command. • Configure all ports in an EtherChannel with the same GARP VLAN Registration Protocol (GVRP), GARP Multicast Registration Protocol (GMRP), and quality of service (QoS) parameters. • Do not configure the ports in an EtherChannel as dynamic VLAN ports. You can adversely affect switch performance. • Make sure port security is disabled on channeled ports. If you enable port security on a channeled port, the port shuts down when it receives packets with source addresses that do not match the secure address of the port. Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 6-4 78-12647-02