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The Catalyst 4000 Layer 3 Services module occupies a single slot in the chassis and has two internal
full-duplex Gigabit Ethernet interfaces that connect directly to the Catalyst 4000 family switch
backplane to provide routing capability to all Layer 2 switch ports in the switch. In addition, there are
two external Layer 3 Gigabit Ethernet ports that provide a direct connection to external router or switch
ports.
The 32 10/100 Ethernet interfaces are configured from the Catalyst 4000 switch supervisor engine.
Refer to the software configuration guide for your switch for Layer 2 configuration information. The
two external and two internal Gigabit Ethernet interfaces are configured from the Layer 3 services
module console. To configure the Layer 3 services module for interVLAN routing, you also must
configure the internal Layer 2 Gigabit Ethernet interfaces from the supervisor engine console.
You can group the two internal Gigabit Ethernet interfaces into two trunks or, one Gigabit
EtherChannel, or you can configure them as independent interfaces (links). If trunked or channeled, the
internal Gigabit Ethernet channel supports trunking using the IEEE 802.1Q protocol. You also can
configure each Gigabit Ethernet interface (link) independently as a separate VLAN trunk or nontrunked
routed interface.
Caution
ISL is supported on the external Layer 3 Gigabit Ethernet ports only. The internal Layer 3
Gigabit Ethernet ports on the Catalyst 4000 Layer 3 Services module do not support ISL.
Do not configure ISL on the internal Layer 3 ports.
The native VLAN can forward tagged and untagged traffic in microcode. This means that
Note
Layer 2 and Layer 3 IP, IPX, and multicast traffic is forwarded in microcode.The native
VLAN continues to be used for routing protocol traffic and for ARP, ping, CDP, and
session-related packets, which are handled by the CPU.
The default native VLAN is VLAN 1. You must configure the native VLAN on the
Note
Catalyst 4000 Layer 3 Services module and the Catalyst 4000 supervisor engine to match
in order to handle CPU-related traffic.
Front Panel Description
Figure 1 shows the front panel of the Layer 3 services module. The features of the front panel are
described in more detail in the following sections.
Figure 1
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Front Panel of the Layer 3 Services Module
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Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
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Front Panel Description
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