Indicator Definitions
Chapter 7 Managing and Viewing Indicators 229
Output
Packet Loss
Reported for physical or virtual interfaces (DLCI, VP, or VC) of any device, ToS roots, ToSs,
VLAN roots, VLANs, VPN roots, or VPNs
Description WAN or serial interfaces receive data as a series of bits. The transmission speed
depends on the characteristics of the line connected to the interface. This line may
be a leased line (E1) or a connection to a switching network, such as Frame Relay,
ATM, or X.25.
LAN interfaces have a fixed bandwidth of 10 or 100 Mbps. In the case of routers,
numerous computers on the LAN often share this bandwidth. Thus, the traffic
generated by a router rarely reaches this limit. In the case of LAN switches, some
of which allow for full-duplex connections, the output rate can reach the
theoretical limit of the cable.
In the case of SFrap probe protocols, this indicator gives the output bandwidth
used by the protocol.
Units Kbps, Mbps, or percentage of total bandwidth
Default
thresholds
Thresholds will be set only if the interface’s line flow rate has been correctly
captured or entered.
■ WAN interfaces: minimum 60%–maximum 80%
■ LAN interfaces: minimum 30%–maximum 40%
■ ToS roots: minimum 500 Kbps–maximum 2,000 Kbps
■ ToSs: minimum 500 Kbps–maximum 2,000 Kbps
■ VLAN roots: minimum 500 Kbps–maximum 2,000 Kbps
■ VLANs: minimum 500 Kbps–maximum 2,000 Kbps
■ VPN roots: minimum 0–maximum 0
■ VPNs: minimum 0–maximum 0
Points to check The saturation rate of an interface varies according to the protocol. For example,
Ethernet saturates at about 40% and X.25 at 80%.
Reported for peers
Description percentage of Internet Control Message Protocol (ICMP) packets dropped during a
round trip between a device managed by PATROL DashBoard and another target
device
Units percentage of dropped packets
Default
thresholds
minimum 30%–maximum 50%
Points to check damaged link or overloaded device between the two peer devices
