Using Services Router Diagnostic Tools; Diagnostic Terms - Juniper J-Series Administration Manual

Chapter 12

Using Services Router Diagnostic Tools

Diagnostic Terms

Table 104: J-series Diagnostic Terms
Term
Don't Fragment (DF) bit
routing instance
loose source routing
J-series Services Routers support a suite of J-Web tools and CLI operational mode
commands for evaluating system health and performance. Diagnostic tools and
commands test the connectivity and reachability of hosts in the network.
This chapter contains the following topics. For complete descriptions of CLI operational
mode commands, see the JUNOS System Basics and Services Command Reference, the
JUNOS Interfaces Command Reference, and the JUNOS Routing Protocols and Policies
Command Reference.
Diagnostic Terms on page 209
Diagnostic Tools Overview on page 210
Before You Begin on page 215
Pinging Hosts from the J-Web Interface on page 216
Checking MPLS Connections from the J-Web Interface on page 219
Tracing Unicast Routes from the J-Web Interface on page 223
Capturing and Viewing Packets with the J-Web Interface on page 226
Using CLI Diagnostic Commands on page 230
Before diagnosing J-series Services Routers, become familiar with the terms defined
in Table 104 on page 209.
Definition
Bit in the IP header that instructs routers not to fragment a packet. You might set this bit if the
destination host cannot reassemble the packet or if you want to test the path maximum
transmission unit (MTU) for a destination host.
Collection of routing tables, interfaces, and routing protocol interfaces. The set of interfaces
belongs to the routing tables, and the routing protocol parameters control the information in the
routing tables.
Option in the IP header used to route a packet based on information supplied by the source. A
gateway or host must route the packet using the routers specified by this information, but the
packet can use other routers along the way.
209
Diagnostic Terms