Cisco Catalyst 2900 Series XL Specifikace stáhnout pdf (Strana 182)

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

78-6511-06

Chapter 7 Configuring the Switch Ports

Creating EtherChannel Port Groups

Fast EtherChannel (FEC) and Gigabit EtherChannel port groups act as single, logical ports for

high-bandwidth connections between switches or between switches and servers.

Note You can create port groups of either Gigabit Ethernet ports or 100BASE-TX ports, but you cannot

create a port group that has both port speeds.

For the restrictions that apply to port groups, see the “Avoiding Configuration Conflicts” section on

page 9-2.

Understanding EtherChannel Port Grouping

This software release supports two different types of port groups: source-based forwarding port groups

and destination-based forwarding port groups.

Source-based forwarding port groups distribute packets forwarded to the group based on the source

address of incoming packets. You can configure up to eight ports in a source-based forwarding port

group. Source-based forwarding is enabled by default.

Destination-based port groups distribute packets forwarded to the group based on the destination address

of incoming packets. You can configure an unlimited number of ports in a destination-based port group.

You can create up to 12 port groups. All ports in each group must be of the same type; for example, they

must be all source-based or all destination-based. You can have source-based port groups and

destination-based source groups. You can independently configure port groups that link switches, but

you must consistently configure both ends of a port group.

In Figure 7-1, a port group of two workstations communicates with a router. Because the router is a

single-MAC-address device, source-based forwarding ensures that the switch uses all available

bandwidth to the router. The router is configured for destination-based forwarding because the large

number of stations ensures that the traffic is evenly distributed through the port-group ports on the router.

Figure 7-1 Source-Based Forwarding

The switch treats the port group as a single logical port; therefore, when you create a port group, the

switch uses the configuration of the first port for all ports added to the group. If you add a port and

change the forwarding method, it changes the forwarding for all ports in the group. After the group is

created, changing STP or VLAN membership parameters for one port in the group automatically changes

the parameters for all ports. Each port group has one port that carries all unknown multicast, broadcast,

and STP packets.

FEC port group

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Source-based

forwarding

Destination-based

forwarding

Cisco router

Catalyst 2900 XL

or Catalyst 3500 XL switch

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