Ip Mls Operation - Cisco 7609 Configuration Manual

Cisco ios software configuration guide—12.1e

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Configuring IP Unicast Layer 3 Switching on Supervisor Engine 1

After the PFC performs the packet rewrite, the packet is formatted (conceptually) as follows:

Frame Header

IP MLS Operation

(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, an MLS entry for this flow is created (this entry

is the second item in the MLS cache shown in

MSFC and Host C in the MLS entry when the MSFC forwards the first packet from Host A through the

switch to Host C. The PFC uses this information to rewrite subsequent packets from Host A to Host C.

Figure 19-1 IP MLS Example Topology

shows a simple IP MLS network topology. In this example, Host A is on the Sales VLAN

Subnet 1/Sales

171.59.1.2: 2000

Destination Source

TTL Checksum

Host A IP n-1

19-1). The PFC stores the MAC addresses of the

Rewrite Src/Dst

Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E

Understanding How IP MLS Works

calculation2

171.59.1.2: 2000