Red Hat Fedora 5 Unleashed

The Foundation Summary is a collection of information that provides a convenient review of many key concepts in this chapter. If you are already comfortable with the topics in this chapter, this summary can help you recall a few details. If you just read this chapter, this review should help solidify some key facts. If you are doing your final preparation before the exam, this information is a convenient way to review the day before the exam.

Table 13-2. InterVLAN Routing Configuration Commands

Task

Command Syntax

Put a port into Layer 2 mode

Switch(config-if)# switchport

Put a port into Layer 3 mode

Switch(config-if)# no switchport

Define an SVI

Switch(config)# interface vlan vlan-id

Components of CEF:

  • Forwarding Information Base (FIB) Contains routing and next-hop information. Lookups are performed according to longest-match IP prefix.

  • Adjacency table Contains Layer 2 address information for next-hop FIB entries that are one hop away.

  • Packet rewrite Hardware dedicated to rewriting the Layer 2 and Layer 3 header information of outbound packets after the forwarding decisions have been made.

Table 13-3. Fallback Bridging Configuration Commands

Task

Command Syntax

Define a fallback bridge group

Switch(config)# bridge-group bridge-group protocol vlan-bridge

Assign an interface to a bridge group

Switch(config)# interface vlan vlan-id Switch(config-if)# bridge-group bridge-group

Table 13-4. Multilayer Switching Verification Commands

Task

Command Syntax

Show a Layer 2 port status

Switch# show interface type mod/num switchport

Show a Layer 3 port status

Switch# show interface type mod/num

Show an SVI status

Switch# show interface vlan vlan-id

View the FIB contents

Switch# show ip cef

View FIB information for an interface

Switch# show ip cef [type mod/num | vlan vlan-id] [detail]

View FIB information for an IP prefix

Switch# show ip cef [prefix-ip prefix- mask] [longer-prefixes] [detail]

View FIB adjacency information

Switch# show adjacency [type mod/num | vlan vlan-id] [summary | detail]

View counters for packets not switched by CEF

Switch# show cef not-cef-switched

Show fallback bridge group status

Switch# show bridge group

Show fallback bridging table contents

Switch# bridge-group bridge-group

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