Foundation Summary

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