Cisco WS-C6506 Software Manual page 328

Understanding How Layer 3 Switching Works
CEF for PFC2/PFC3A Examples
Figure 13-1
(IP subnet 171.59.1.0), Host B is on the Marketing VLAN (IP subnet 171.59.3.0), and Host C is on the
Engineering VLAN (IP subnet 171.59.2.0).
When Host A initiates an HTTP file transfer to Host C, PFC2/PFC3A uses the information in the FIB
and adjacency table to forward packets from Host A to Host C.
Figure 13-1
MAC = Aa
Host A
171.59.1.2
Data
Figure 13-2
(IPX address 01.Aa), Host B is on the Marketing VLAN (IPX address 03.Bb), and Host C is on the
Engineering VLAN (IPX address 02.Cc).
When Host A initiates a file transfer to Host C, PFC2 uses the information in the FIB and adjacency table
to forward packets from Host A to Host C.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
13-10
shows a simple IP CEF network topology. In this example, Host A is on the Sales VLAN
IP CEF Example Topology
Source IP Destination
Address IP Address
171.59.1.2 171.59.3.1
171.59.1.2 171.59.2.2
171.59.2.2 171.59.1.2
Subnet 1/Sales
171.59.1.2:171.59.2.2
shows a simple IPX CEF network topology. In this example, Host A is on the Sales VLAN
Chapter 13
Rewrite Src/Dst Destination
MAC Address
Dd:Bb
Dd:Cc Engineering
Dd:Aa
MAC = Dd
MSFC
Aa:Dd
Data
Configuring CEF for PFC2 and PFC3A
VLAN
Marketing
Sales
MAC = Bb
Host B
171.59.3.1
MAC = Cc
Host C
171.59.2.2
171.59.1.2:171.59.2.2 Dd:Cc
OL-8978-04