Getting started

About this guide

This guide describes details pertaining to Integrated Services Adapters (ISAs) and Extended Services Appliances (ESAs) and the services they provide. ISA may refer to ISA2 or an ESA-VM unless otherwise specified.

This guide is organized into functional chapters and provides concepts and descriptions of the implementation flow, as well as Command Line Interface (CLI) syntax and command usage.

Note: Unless otherwise indicated, this guide uses classic CLI command syntax and configuration examples.

The topics and commands described in this document apply to the:

7450 ESS
7750 SR
Virtualized Service Router

For a list of unsupported features by platform and chassis, and for services supported by ISAs and ESAs, see the SR OS R23.x.Rx Software Release Notes, part number 3HE 19269 000x TQZZA.

Command outputs shown in this guide are examples only; actual displays may differ depending on supported functionality and user configuration.

Note: The SR OS CLI trees and command descriptions can be found in the following guides:

7450 ESS, 7750 SR, 7950 XRS, and VSR Classic CLI Command Reference Guide
7450 ESS, 7750 SR, 7950 XRS, and VSR Clear, Monitor, Show, and Tools CLI Command Reference Guide (for both MD-CLI and Classic CLI)
7450 ESS, 7750 SR, 7950 XRS, and VSR MD-CLI Command Reference Guide

Note: This guide generically covers Release 23.x.Rx content and may contain some content that will be released in later maintenance loads. See the SR OS R23.x.Rx Software Release Notes, part number 3HE 19269 000x TQZZA for information about features supported in each load of the Release 23.x.Rx software.

ISA and ESA configuration process

The ESA is specialized hardware that hosts ESA Virtual Machines (ESA-VMs). Each ESA-VM is configured as an integrated service type. ESA extends the proven Integrated Services Adapter (ISA) system implementation architecture and related control processing module (CPM) functions on the 7750 SR systems to include ESA-VM-based virtual ISA (v-ISA) functionality.

ISA and ESA configurations and supported features lists the ISA and ESA configurations with descriptions and their supported functionalities.

Table 1. ISA and ESA configurations and supported features
Configuration	Description	Supported features
mda type: isa2-aa esa vm-type: aa	Application Assurance	Per-flow stateful deep packet inspection on OSI Layers 3 to 7 Release-independent protocol signatures, applications, application groups, and charging groups Flow attribute classification using deterministic and heuristic machine-learning algorithms Per-application and per-attribute policy enforcement and charging Layer 7 stateful firewall to block unsolicited traffic, with full application-level gateway (ALG) URL filtering and web classification based filtering Access network congestion detection and control using Dynamic Experience Management Application and protocol based volume and performance reporting
mda type: isa2-bb esa vm-type: bb	Broadband	CGN: LSN44, DS-Lite and NAT64 L2-Aware NAT for tight integration between BNG subscribers and NAT44 LNS WLAN-GW vRGW Generic re-assembly and TCP MSS-adjust
mda type: isa2-tunnel esa vm-type: tunnel	IP tunnels	IPsec tunnel: Secure network traffic on IP level for site-to-site, remote-access, mobile backhaul GRE/IP-in-IP tunnel: Overlay IP interface with transport as GRE/IP-in-IP tunnel L2TPv3 tunnel: Pseudowire for VPLS and Routed VPLS
mda type: isa2-video	Video	Fast Channel Change (FCC) Video Packet Retransmission (RET) Video Quality Monitoring (VQM) Perfect Stream Multicast (S,G) NAT

Configuration details is a summary of the ISA and ESA virtual machines (ESA-VMs) guide structure by task. Specific configuration details for a software area, CLI syntax and command usage to configure parameters for each function are contained within each section.

Table 2. Configuration details
Area	Task	Section
Application Assurance	Configure Application Assurance entities	Configuring AA with CLI
IP tunnels	Determine IPsec deployment requirements	IPsec deployment requirements
IP tunnels	Configure IPsec	Configuring IPsec with CLI
L2TPV3 tunnels	Configure the L2TPV3 control plane	Control plane
	Configure public SAP	Public SAP
	Configure private SAP	Private SAP
Video services	Configure video services components	Configuring video service components with CLI
Video services	Configure REF/FCC video components	Configuring RET/FCC video components with CLI
Network Address Translation	Configure NAT on SR	Configuring NAT
Network Address Translation	Configure NAT on VSR	Configuring VSR-NAT
Residential firewall	Configure the residential firewall	Residential firewall provisioning
TCP MSS adjustment	Configure TCP MSS adjustments for BB	TCP MSS adjustment
	Configure TCP MSS adjustments for tunnel-ISA	TCP MSS adjustment
	Configure AA TCP MSS adjustments	AQP
L2TP network server	Configure subscriber aggregate rate limit on LNS	Subscriber agg-rate-limit on LNS
	Configure LNS reassembly	LNS reassembly
	Configure MLPPPoE and MLPPP(oE)oA with LFI on LNS	MLPPPoE, MLPPP(oE)oA with LFI on LNS

Conventions

This section describes the general conventions used in this guide.

Precautionary and information messages

The following information symbols are used in the documentation.

DANGER: Danger warns that the described activity or situation may result in serious personal injury or death. An electric shock hazard could exist. Before you begin work on this equipment, be aware of hazards involving electrical circuitry, be familiar with networking environments, and implement accident prevention procedures.

WARNING: Warning indicates that the described activity or situation may, or will, cause equipment damage, serious performance problems, or loss of data.

Caution: Caution indicates that the described activity or situation may reduce your component or system performance.

Note: Note provides additional operational information.

Tip: Tip provides suggestions for use or best practices.

Options or substeps in procedures and sequential workflows

Options in a procedure or a sequential workflow are indicated by a bulleted list. In the following example, at step 1, the user must perform the described action. At step 2, the user must perform one of the listed options to complete the step.

Options in a procedure

User must perform this step.
This step offers three options. User must perform one option to complete this step.
- This is one option.
- This is another option.
- This is yet another option.

Substeps in a procedure or a sequential workflow are indicated by letters. In the following example, at step 1, the user must perform the described action. At step 2, the user must perform two substeps (a. and b.) to complete the step.

Substeps in a procedure

User must perform this step.
User must perform all substeps to complete this action.
1. This is one substep.
2. This is another substep.