Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 257

Chapter 14 Configuring MLS
Figure 14-1 IP MLS Example Topology
Source IP
Address
171.59.1.2
171.59.1.2
171.59.2.2
MAC = Aa
Host A
171.59.1.2
Data
Figure 14-2
(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 B, an IPX MLS entry for this flow is created (this entry is
the first item in the table shown in
Host B in the IPX MLS entry when the MSFC forwards the first packet from Host A through the switch
to Host B. The PFC uses this information to rewrite subsequent packets from Host A to Host B.
Similarly, a separate IPX MLS entry is created in the MLS cache for the traffic from Host A to Host C,
and for the traffic from Host C to Host A. The destination VLAN is stored as part of each IPX MLS entry
so that the correct VLAN identifier is used when encapsulating traffic on trunk links.
78-13315-02
Destination
Application
IP Address
171.59.3.1 FTP
171.59.2.2 HTTP
171.59.1.2 HTTP
MAC = Dd
MSFC
Subnet 1/Sales
171.59.1.2: 2000 Aa:Dd
shows a simple IPX MLS network topology. In this example, Host A is on the Sales VLAN
Figure
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Understanding How Layer 3 Switching Works
Rewrite Src/Dst Destination
MAC Address VLAN
Dd:Bb Marketing
Dd:Cc Engineering
Dd:Aa Sales
MAC = Bb
Host B
171.59.3.1
MAC = Cc
Host C
171.59.2.2
Data 171.59.1.2: 2000
14-1). The PFC stores the MAC addresses of the MSFC and
Dd:Cc
14-9