Operate and maintain
Documents under this category provide functional descriptions and procedures for configuring, operating, and maintaining 7705 SAR Gen 2 routers.
- Basic System Configuration Guide
  This guide describes file system management, boot option file (BOF) configuration, basic system management configuration, node timing, and synchronization functions.
- Interface Configuration Guide
  This guide describes how to provision Input/Output Modules (IOMs), Media Dependent Adapters (MDAs), connectors, and ports.
- Layer 2 Services and EVPN Guide
  This guide describes Layer 2 service and Ethernet Virtual Private Network (EVPN) functionality and provides examples to configure and implement Virtual Leased Lines (VLLs), Virtual Private LAN Service (VPLS), and EVPN.
- Layer 3 Services Guide: IES and VPRN
  This guide describes Layer 3 service functionality and provides examples to configure and implement Internet Enhanced Services (IES) and Virtual Private Routed Network (VPRN) services.
- MD-CLI User Guide
  This guide provides information about how to use the MD-CLI.
- MPLS Guide
  This guide provides an overview of Multiprotocol Label Switching (MPLS), Resource Reservation Protocol (RSVP), and Label Distribution Protocol (LDP) and provides configuration examples.
- MS-ISA and ESA Guide
  This guide provides an overview of services provided by integrated service adapters and extended service appliances, such as IPsec and Network Address Translation (NAT), and provides configuration examples.
- Multicast Routing Protocols Guide
  This guide provides an overview of multicast routing concepts and provides configuration examples for Internet Group Management Protocol (IGMP), Multicast Listener Discovery (MLD), and Protocol Independent Multicast (PIM).
- Quality of Service Guide
  This guide provides an overview of Quality of Service (QoS) policy management and provides configuration examples.
- Router Configuration Guide
  This guide dscribes logical IP routing interfaces and associated attributes such as IP addresses, as well as IP and MAC-based filtering, Virtual Router Redundancy Protocol (VRRP), and cflowd.
- Segment Routing and PCE User Guide
  This guide provides an overview of segment routing features with MPLS (SR-MPLS) data path encapsulations and path computation element (PCE) features.
- Services Overview Guide
  This guide provides a general overview of functionality provided by the routers and describes how to configure service parameters such as Service Access Points (SAPs), Service Distribution Points (SDPs), customer information, and user services.
- System Management Guide
  This guide describes system security features, SNMP and NETCONF features, and event and accounting logs; the guide also covers basic tasks such as configuring management access filters, passwords, and user profiles.
- Unicast Routing Protocols Guide
  This guide provides an overview of unicast routing concepts and provides configuration examples for Routing Information Protocol (RIP), Open Shortest Path First (OSPF), Intermediate-system-to-intermediate-system (IS-IS), and Border Gateway Protocol (BGP) routing protocols; also provides an overview of route policies and configuration examples.

Raw socket squelch functionality

A condition may occur where the end device connected to the serial port continues to send out a continuous stream of data after the normal response period has expired. This can prevent the far-end remote host or master equipment from receiving data from other end devices in the network. To resolve this condition, the squelch command can be used on the raw socket at the port level (it is disabled by default). This stops the socket from receiving any more data from the problematic device.

If the command is enabled, the 7705 SAR Gen 2 monitors the serial port for a constant character stream. A configurable squelch delay period, using the following command, determines how long to measure the constant character stream before initiating the squelch function.

configure port serial rs232 socket rx squelch-delay

If the squelch function is initiated, the port is considered locked up, and an alarm is raised indicating the lock-up and that the squelching function has been triggered.

The serial port can be forced out of squelch and put back to normal, either manually using the squelch-reset command or automatically using the following command.

configure port serial rs232 socket rx unsquelch-delay

The unsquelch-delay command defines the time to wait after squelch is initiated before it is removed.

March 12, 2026