CANOGA PERKINS N525 Ethernet Termination Service Unit - Manual (Page 26)

3-8 N525 Ethernet Termination Service Unit
Diagnostics
Used to set up loopback, latency and jitter, or PING tests and to configure and run
Network Performance Assurance (optional software).
Loopback Setup
This initiates and configures the N525 for loopback diagnostics. Packets are loop
backed based on MAC address of the N525. The N525 is configurable to swap
origination and destination MAC addresses of the test packet and to recalculate the
CRC of the looped packet when the MAC address are swapped.
Latency/Jitter Test
This manually initiated test is used to measure network latency, inter-frame jitter and
frame loss from this N525 to a remote N525 in a network. Configuration items are:
1. To IP Address
This is the remote N525’s IP Address
2. From IP Address
This selects the originating IP address from the N525 places into the test
packets. Choices are Auto Selection, Management IP or Aux IP.
3. Test VLAN
This is the VLAN Tag the test packets will carry. It can be the Management
VLAN or any customer VLAN.
4. Test Packets per sec
This lets you control the amount of packets that will be sent for every second
the test runs. Settings are: 1, 2, 5, 10, 20, 50 and 100.
5. DF Bit
This applies when you are testing with oversized packets over 1518 bytes in
length. It is an identifier in the packet that lets other network devices (i.e.
routers, switches, bridges) know if this packet can be fragmented to smaller
packets or not.
6. DSCP Precedence / Drop Probability
Short for Differentiated Services Code Point. N525s at the edge of the
network classify packets and mark them with either the IP Precedence or
DSCP value in a Diffserv network. Other network devices in the core that
support Diffserv use the DSCP value in the IP header to select a PHB
behavior for the packet and provide the appropriate QoS treatment.
7. Test Packet Priority
This lets you set packet priority: 0 – highest priority / 7 – lowest priority.
8. Test Duration
This is the duration the test will run for in min:sec, 0 – is forever
9. Min test payload (40 – 1954)
This sets the minimum test packet size in bytes. The N525 sends test
packets ranging in size from the minimum packet size to the maximum packet
size if they are different. This is done by mapping the packets to be sent onto
the range of sizes between the minimum and maximum packet sizes. The
minimum packet size must be less than or equal to the maximum packet size.