Enterasys Networks Security Router X-PeditionTM - Manual (Page 77)

Network Management through SNMP
XSR User’s Guide 2-41
Latency (network delay) is measured with the formula: D(i)=(Ri-Si), which is the round-trip
interval between sending and receiving the ICMP packet triggered by the initiator and echoed
back by the target.
Jitter (network delay variation) is the value between packets i and j as figured by the formula:
D(i,j)=(Rj-Ri)-(Sj-Si). Since the XSR measures the round trip, Ri indicates the receive interval at the
source instead of the target.
Packet loss - If an ICMP echo reply packet is not received within a specified time, it is considered
lost. This does not allow the operator to identify whether the packet is lost on the way to the target
or when the response is traveled from the target back to the sender.
Configuration Examples
The following CLI and SNMP examples illustrate how to create: an owner, a measurement to ping,
schedule a measurement, and query a measurement.
Create an Owner
The XSR provides a default owner monitor residing in the first row of the owner table. If you want
to create another RTR owner, follow the instructions below.
Via CLI
The following example creates the user Clem:
XSR(config)#rtr owner Clem
Via SNMP
The example below creates a user in row 2 of the table (the instance is 2 as indicated in bold):
1. Create a row (etsysSrvcLvlOwnersStatus):
1.3.6.1.4.1.5624.1.2.39.1.2.1.1.9.2 = 5 (createAndWait)
2. Configure user (etsysSrvcLvlOwnersOwner):
1.3.6.1.4.1.5624.1.2.39.1.2.1.1.2.2 = userA
3. Change the row status to active (etsysSrvcLvlOwnersStatus):
1.3.6.1.4.1.5624.1.2.39.1.2.1.1.9.2 = 1 (active)
Refer to “Standard ASCII Character Table” on page A-19 for more information. With NetSight
Atlas MIB Tools, retrieve the ASCII value from the Raw Value column, as shown in Figure 2-4 .
Figure 2-4 NetSight Atlas MIB Tools Screen
Create a Measurement to Ping
Via CLI
The following example adds a ping measurement to IP address 1.1.1.1:
XSR(config)#rtr 1
XSR(config-rtr-echo-1)#type echo protocol ipIcmpEcho 1.1.1.1
Note: The string userA is equivalent to the ASCII value 117:115:101:114:65, which will be used to
index into the aggregate measure table. If you want to use the default owner, the ASCII value of the
default owner (monitor) is 109:111:110:105:116:111:114.