![]() The table below shows the version support per product and platform: Product Please note that there is backward compatibility between IMA 1.1 and 1.0. The DSL switches and routers, however, support IMA version 1.1. The IMA cards for the LS1010/8510MSR/8540MSR ATM switches support version 1.0 only. The Cisco 7200 series router IMA Port Adapters (PAs) support version 1.0 only, as do the 3600/2600 router series Network Modules (NMs). ![]() Cisco support for both versions currently differs according to product type. What versions of IMA are supported by Cisco Systems?Ī. Cisco IMA Cards support LANE v.1 and LANE v.2. However, there is support for the other classes, including Variable Bit Rate- non real time (VBR-nrt), Variable Bit Rate-real time (VBR-RT), Unspecified Bit Rate (UBR), and Available Bit Rate (ABR).Ī. The IMA cards have no support for Constant Bit Rate (CBR) or Unspecified Bit Rate Plus (UBR+) traffic. Are all ATM Service Categories supported on the IMA Cards?Ī. Please refer to the following documents for more information:įrame Relay-to-ATM Network Interworking (FRF.5)įrame Relay to ATM Service Interworking (FRF.8 - Translation Mode) Please note that the IMA cards can be used as the ATM end of an FRF8 circuit or the ATM interface for a router which is configured as an ATM to Frame-Relay Switch in an FRF5 network. For this reason, it is not possible to run any other Layer 2 technology over the IMA cards. An ATM cell is fixed in length and consists of 53 bytes. This means that the circuit operates based on ATM cells. The underlying Layer 2 technology for the IMA cards is ATM. Can I run Frame Relay over my IMA Circuit?Ī. ![]() Router 2 RELEVANT Configuration ONLY interface ATM2/6 Router 1 RELEVANT Configurations ONLY interface ATM1/0 These cables can be made by wiring the pins on two RJ 45 adapters as follows, using a normal UTP cable: Please refer to Inverse Multiplexing over ATM on Cisco 7X00 Routers and ATM Switches for more information.Ī. With IMA, two or more T1 circuits can be "bundled" to effectively gain upward of 3Mbps speeds. This technology provides a scalable and cost-effective solution for customers seeking to expand WAN bandwidth from T1 speeds, without having to pay for DS3 or OC3 circuits. IMA stands for Inverse Multiplexing for ATM. Specific questions pertaining to DSL products and the IGX/MGX WAN switches are not addressed in this document.Ī. This FAQ addresses IMA issues related to the 2600/3600 7x00 router series, Catalyst Multiservice Switch router (MSR) 8500 series, and Lightstream LS1010 Asynchronous Transfer Mode (ATM) switches.
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