2.1. In This Section

This section provides an overview of Nokia’s implementation of the ISA hardware.

Topics include:

2.2. MS-ISA2 Overview

The MS-ISA2 (or ISA2-MS in CLI) is a second generation Integrated Services Adapter for Multi-Service processing, as a resource module within the router system providing packet buffering and packet processing.

The MS-ISA2 fits in an MDA/ISA slot on an IOM4-e and has no external ports, so all communication passes through the Input/Output Module (IOM), making use of the network processor complex on the host IOM for queuing and filtering functions like other MDAs and ISAs.

The actual ingress and egress throughput will vary depending on the buffering and processing demands of a given application, but the MS-ISA2 hardware can support 40 Gbps of throughput processing.

2.3. MS-ISA Overview

The MS-ISA (or ISA-MS in CLI) is an Integrated Services Adapter for Multi-Service processing, as a resource module within the router system providing packet buffering and packet processing.

The MS-ISA fits in an MDA/ISA slot on an IOM and has no external ports, so all communication passes through the IOM, making use of the network processor complex on the host IOM for queuing and filtering functions like other MDAs and ISAs.

The actual ingress and egress throughput will vary depending on the buffering and processing demands of a given application, but the ISA-MS hardware can support slightly more than 10 Gbps of throughput ingress and egress.

With the introduction of the MS-ISM and ISA2 processing, ISA-MS may also be referred to as ISA1, as the first generation ISA hardware.

Figure 1:  MS-ISA on Host IOM 

2.4. MS-ISM Overview

The Multi-Service Integrated Services Module (MS-ISM) card contains two ISA2 processing modules providing increased packet processing throughput and scale compared to the MS-ISA platform. Each ISA2 processing module supports a 40G datapath for packet processing; as with ISA1 the actual throughput varies by function.

The IOM base card is an imm-2pac-fp3 with two embedded positions for ISA2s. Hot swap or field replacement of the ISA2s within an MS-ISM assembly is not supported. IMM cards offering 10x10GE media plus one ISA2, or 1x100GE media plus one ISA2.

Figure 2:  MS-ISM with ISA2s 

The MS-ISA2 remains as a common base hardware assembly to be used as a generic CPU processing platform for multiple applications. The functions supported on the MS-ISA2 and MS-ISM include the following software based capabilities:

2.5. Application Assurance Hardware Features

2.5.2. Host IOM Support for AA on ISAs

The AA MS-ISA is supported on IOM-20G-B, IOM2-20g, IOM3-XP, CFM-XP (c12), and IOMc4-xp. The MS-ISM versions contains one or two ISA2s embedded on a IMM card. The MS-ISA2 is supported on the IOM4-e.

Each IOM can support a maximum of two AA ISA modules. To maximize AA ISA redundancy, deployment of AA ISAs on separate host IOMs is recommended as it provides IOM resilience. Traffic from any supported IOM (for example, the IOM-20G-B, and IOM3-XP, fixed port IOMs (IMMs)) can be diverted to AA ISA host IOM.

The MS-ISA is field replaceable and supports hot insertion and removal. See Figure 1. A system can support up to seven active AA MS-ISA cards providing up to 70 G of processing capacity (a system with seven active ISA2s on MS-ISMs provides up to 280G processing).

AA ISA software upgrades are part of the ISSU functionality. Upgrades to AA ISA software, for example to activate new protocol signatures, do not impact the second MDA slot for the IOM carrying the AA ISA, nor do upgrades impact the router itself (for example. a new AA ISA software image can be downloaded without a need to upgrade other software images).

Figure 3:  AA ISA on Host IOM 2-20G Example