The Catalyst® 8540 MSR ATM Router Module (ARM) provides high-speed interworking between the asynchronous transfer mode (ATM) and Layer 3 interfaces in a single chassis. The ARM is supported by the Catalyst 8540 MSR platform, a high-end multiservice switch that provides large enterprises and service providers with a wide range of Layer 3 and ATM interfaces for building integrated solutions.
Catalyst 8540 ATM Router Module
Table 1: Feature Summary
|Integrated Layer 3 and ATM|
|Cisco Express Forwarding (CEF)|
|Online Insertion and Removal|
The ARM is unique in that it allows Layer 3 traffic to pass seamlessly between ATM and Layer 3 interfaces. The benefit to the customer is that wire-speed Layer 3 switching between frame (Gigabit Ethernet/Fast Ethernet) ports, ATM switching between ATM ports, and high-speed frame/ATM interworking are combined in a single chassis. The result is fewer products in the network, simplified network designs, and a lower total cost of ownership.
ARM features Cisco Express Forwarding (CEF), a new paradigm for route distribution and forwarding by distributing routing information from the central processor to the individual interface modules. Used within the Internet, this technology provides for scalability in large campus core networks. CEF provides Layer 3 forwarding based on a "shadow" of the routing table, resulting in very-high-speed routing table lookups and forwarding. This feature provides for wire-speed IP and IPX switching.
The Catalyst 8540 supports advanced technology that enables online insertion and removal (OIR) of the ARM module without powering-down the switch. When the ARM module is removed or inserted while the switch is powered on and operating, the system:
The Catalyst 8540 MSR provides support for IP and IPX forwarding and routing. IP routing support includes Routing Information Protocol (RIP) Versions 1 and 2, Open Shortest Path First (OSPF), Interior Gateway Routing Protocol (IGRP) and Enhanced IGRP (EIGRP), and Border Gateway Protocol (BGP) Version 4. IPX routing support includes RIP and EIGRP.
Using LANE, ARM supports emulated LAN (ELAN) to ELAN bridging. When RFC 1483 is used, Layer 2 traffic can be bridged between ATM permanent virtual connections (PVCs). In addition, the Institute of Electrical and Electronic Engineers (IEEE) 802.1d Spanning-Tree Protocol is supported.
Integrated routing and bridging (IRB) provides a means to route a given protocol between routed and bridged interfaces. Bridged Virtual Interfaces (BVIs) configured with IRB can be used for routing a protocol between bridge groups.
The Catalyst 8540 supports both Internet Group Management Protocol (IGMP) and Cisco Group Management Protocol (CGMP) server to enable the deployment of scalable multicast networks. IGMP uses the IP transport that enables hosts to join a multicast group dynamically. IGMP queries joins and leaves (IGMPv2) are supported. CGMP provides a way for Layer 2 switches to provide Layer 2 multicast control.
Hot Standby Router Protocol (HSRP) is designed to provide high network availability by routing IP traffic from hosts on Ethernet networks without relying on the availability of any single router. This feature is particularly useful for hosts that do not support a router discovery protocol such as Internet Control Message Protocol (ICMP) Router Discovery Protocol (IRDP) and do not have the functionality to switch to a new router when their selected router reloads or loses power. Without this functionality, a router that loses its default gateway because of a router failure is unable to communicate with the network.
Cisco Discovery Protocol (CDP) runs on all Cisco devices so that these devices can learn about neighboring devices and exchange information. CDP uses a well-known multicast Media Access Control (MAC) address. During system initialization, the application-specific integrated circuit (ASIC) will be configured to forward these packets to the Cisco IOS software CPU, which will process them.
Figure 1 High-Speed Enterprise Campus
At a service provider's point of presence, the ATM Router Module can be used to aggregate Layer 3 traffic on Gigabit Ethernet/Fast Ethernet ports and seamlessly interwork this traffic over an ATM backbone network.
Figure 2 Service Provider Point-of-Presence
Table 2: Required Software
|Platform||Features||Minimum IOS Software Image||Software Product Number|
|Catalyst 8540 MSR|
|Catalyst 8540 MSR|
Table 3: Product Code and Availability