Routing with an Chip Router

Routing with an Chip Router

Early approaches to interVLAN acquisition acclimated alien routers and concrete links. Further

developments accept confused the avenue processor central the switch, for accessibility and tighter

integration of the Layer 2 and 3 components.

atm0

Catalyst A

atm0

atm0

Router

atm 0.1: LEC1, LES/BUS 1

atm 0.2: LEC2, LES/BUS 2

atm 0: LECS

atm 0.1: LEC1

atm 0.2: LEC2

Catalyst B

atm 0.1: LEC1

atm 0.2: LEC2

250 Affiliate 7: InterVLAN Routing

Cisco offers several types of chip avenue processors in its Catalyst about-face family.

• Avenue About-face Module (RSM) and Avenue About-face Feature Card (RSFC)—Route

processor modules for the Catalyst 5000 family. The RSM is based on the Cisco 7500

Route About-face Processor and runs the Cisco IOS software. The RSFC is based on the 7200

series Avenue About-face Processor, runs IOS, and operates with the Catalyst 5000 Supervisor

IIG and IIIG.

• Multilayer About-face Feature Card (MSFC)—An IOS-based avenue processor for the

Catalyst 6000/6500 families that provides MLS. Rather than accommodate interVLAN routing,

the MSFC works in affiliation with the Catalyst switching agent to set up and shortcut

switch Layer 3 and college protocols. As acclaimed below, MLS and the MSFC are covered in

Chapter 8.

Each of these avenue processors can additionally participate in MLS, area the about-face creates shortcut

paths with the abetment of a avenue processor. Because MLS is covered in the afterward chapter,

this area alone discusses the appliance of interVLAN acquisition with these modules.

The RSM interfaces to the Catalyst 5000/5500 backplane through two absolute anamnesis access

(DMA) connections. The channels are referred to as Channel0 and Channel1, anniversary providing

200-Mbps throughput. VLANs are accurate through the use of basic VLAN interfaces (that

is, VLAN 1, VLAN 2, and so on).