Specifications

150 Chapter 6. Managing the Router
Chapter 6. Managing the Router
This chapter describes facilities for managing, monitoring, and securing the router. The options discussed include:
¥ SNMP, Syslog, TFTP, Telnet, and BootP support
¥ Booting software
¥ Upgrading the router with new releases of software
¥ Backing up and restoring configuration files
¥ FLASH memory recovery
¥ Password recovery
¥ Script execution
SNMP Support
SNMP (Simple Network Management Protocol), a member of the TCP/IP protocol suite, was designed to provide
network management interoperability among different vendorsÕ management applications and equipment. SNMP
provides for the exchange of messages between a management client and a management agent. The messages
contain requests to get or set variables that exist in network nodes, thus allowing a management client to obtain
statistics, set configuration parameters and monitor events. These variables (or objects) are defined in
Management Information Bases (MIBs), some of which are general or standard SNMP-defined bases. Other
bases, such as Enterprise Specific MIBs are defined by different vendors for specific hardware.
The router provides SNMP agent support and support for standard as well as Enterprise Specific MIBs. SNMP is
also used internally for configuration of the router. The active SNMP agent within the router accepts SNMP
requests for status, statistics, and configuration updates. Communication with the SNMP agent occurs over the
LAN or WAN connection.
The supported MIBs and a description of their contents are listed in the following table:
Any management application using SNMP over UDP/IP has access to the local SNMP agent. SNMP network
management tools vary but often have features to display network maps of SNMP nodes, poll nodes at intervals,
MIB II
Internet-standard MIB contains only essential elements such as system,
interface, addressing, protocol (e.g., IP) and SNMP objects
Bridge MIB
State/statistics (including spanning tree states) within bridging system
Ethernet MIB
State/statistics of Ethernet port (e.g., collisions)
IP Forwarding MIB
State of routing tables (updates MIB II)
PPP MIB For LCP
State/statistics for each PPP link
Enterprise MIB for conÞguration
Router-speciÞc objects for conÞguration purposes