DETAILED STEPS
Step 1 From the Feature Selector pane, choose
Network Analysis > Path Latency Monitoring (PONG)
.
The Summary pane appears in the Contents pane. Each row in the table is a path latency session. You are able to view the sessions that you have created as well as the sessions created by other users. See
Table 34-1
.
Users with administrator privileges are allowed to modify other users’ sessions.
Table 34-1 Information in Summary Pane
|
|
Session ID
|
Unique ID of the session created by the user. The ID is updated after the user deploys the session.
|
Session Name
|
Unique name entered by user for the path latency session.
|
Source Switch
|
IP address of the source switch from which path latency is monitored.
|
Destination Switch
|
IP address of the destination switch to which the path latency is monitored.
|
VLAN
|
VLAN ID through which the actual traffic flows (1 to 4094).
|
Class of Service (CoS)
|
Optional value used to filter the traffic monitoring based on class of service value (0 to 7). CoS values are shown in
Table 34-2
.
|
Round Trip Time (microseconds)
|
Minimum, maximum, average and latest value of the round trip time (two way path: source <-> destination) of all the RTT latencies calculated up until current time.
|
Forward Delay (microseconds)
|
Minimum, maximum, average and latest value of the forward delay (forward path: source -> destination) of all the forward delay latencies calculated to the current time.
|
Reverse Delay (microseconds)
|
Minimum, maximum, average and latest value of the reverse delay (reverse path: destination -> source) of all the reverse delay latencies calculated to the current time.
|
Owner
|
Creator of the session.
|
Success Percentage
|
Success percentage of the packets traversed from source to destination during the specified time interval.
|
Scheduled At
|
Date and time when the monitoring was started.
|
Status
|
Column that specifies:
-
Session created
-
Monitoring started
-
Monitoring stopped
|
Table 34-2 CoS Values and Corresponding Traffic Types
|
|
0
|
Background
|
1
|
Best Effort
|
2
|
Excellent Effort
|
3
|
Critical Applications
|
4
|
Video, < 100 ms latency
|
5
|
Voice, < 10 ms latency
|
6
|
Internetwork Control
|
7
|
Network Control
|
Step 2 Above the Summary pane, click the
Configure New Rule
link to set a threshold rule for one of the following parameters.
-
Round trip time
-
Forward delay
-
Reverse delay
Note Clicking Configure New Rule links you to Theshold Rules of the DCNM-LAN Server Administration feature.
Step 3 Above the Summary pane, click the
Set Global Threshold
link to set a global threshold rule for the following parameters:
-
Round trip time
-
Forward delay
-
Reverse delay
The global threshold setting is applied to all the sessions in the Summary Table.
Step 4 Above the Summary pane, click the
VLAN-CoS
button to view the sessions grouped by VLAN-CoS.
DETAILED STEPS
Step 1 From the Feature Selector pane, choose
Network Analysis > Path Latency Monitoring (PONG)
.
The Summary pane appears in the Contents pane.
Step 2 In the Summary pane, right-click and choose
New Path Latency Session
in the context menu.
The New Path Latency Session wizard appears.
Step 3 In the Select Session Monitor Option of Interest screen, enter the following:
(Length: 1 to 256 characters)
(Value: 1 to 4094)
Table 34-3 CoS Values and Corresponding Traffic Types
|
|
0
|
Background
|
1
|
Best Effort
|
2
|
Excellent Effort
|
3
|
Critical Applications
|
4
|
Video, < 100 ms latency
|
5
|
Voice, < 10 ms latency
|
6
|
Internetwork Control
|
7
|
Network Control
|
Step 4 In the Select Option section, choose one of the following options:
-
Monitor latency between source VDC and destination VDC.
-
Monitor latency between source and destination VDC including source switching delay.
-
Monitor latency between source and destination VDC including destination switching delay.
-
Monitor latency between source and destination VDC including both switching delays.
Under the Monitor latency between source VDC and destination VDC option, you can additionally choose to measure the latency between switches that have Fabric Path mode connectivity. The latency measurements are measured between the source and destination switches but do not include the switching delay of both the end switches.
Note For the switches that are in a classical ethernet cloud, the wizard allows you to choose their VDC MAC addresses/IP addresses/hostnames in the following wizard screen.
Click
Next
to continue.
Step 5 In the Select Source and Destination Switch screen, do the following:
-
Choose the source switch by clicking on the ellipses next to the Select Source Switch field. Highlight the device in the screen that appears and click
OK
to enter your selection.
-
Choose the destination switch by clicking on the ellipses next to the Select Destination Switch field. Highlight the device in the screen that appears and click
OK
to enter your selection.
Depending on the earlier selection that you made in the Select Option section of the wizard,
Table 34-4
list the required and optional information that you must enter in the Select Source and Destination Switch screen.
Table 34-4 Required and Optional Information
|
|
|
Monitor latency between source VDC and destination VDC
|
|
-
Egress/outbound interface through which the packet flows out from the source.
|
Monitor latency between source and destination VDC including source switching delay
|
-
Source and destination
-
Inject/ingress interface through which the packet needs to be injected from the source switch. Also requires the source static MAC address associated with the interface.
|
|
Monitor latency between source and destination VDC including destination switching delay
|
-
Source and destination
-
Egress/outbound interface through which the packet terminates at the destination switch. Also requires the destination static MAC address associated with the interface.
|
-
Egress/outbound interface through which the packet flows out from the source.
|
Monitor latency between source and destination VDC including both switching delays
|
-
Source and destination
-
Inject/ingress interface through which the packet needs to be injected from the source switch. Also requires source static MAC address associated with the interface.
-
Egress/outbound interface through which the packet terminates at the destination switch. Also requires the destination static MAC address associated with the interface.
|
|
Note You can enter any arbitrary unique static MAC address that points to the selected interface. To configure a new static MAC address, use one of the following recommended addresses to avoid any conflict with globally administered MAC addresses (associated with any other host/devices):
-
X2XX.XXXX.XXXX
-
X6XX.XXXX.XXXX
-
XAXX.XXXX.XXXX
-
XEXX.XXXX.XXXX
where X is a hexadecimal value.
Click
Next
to continue.
Step 6 In the dialog box that appears, click
OK
to start input verification.
The Input Verification screen appears and the results are displayed.
Input verification verifies the following:
-
Path latency measurement between specified devices.
-
Packet traversal between the specified devices.
If the verification fails, you must specify the information that you entered earlier in the wizard.
Table 34-5
lists the additional settings that are available in the Input Verification window:
Table 34-5 Input Verification Settings
|
|
|
Monitor Interval
|
Interval of time between data collection points.
|
0.5 - 5 minutes
(Default: 5 minutes)
|
End Time
|
Time of session termination
|
N/A
|
Calculate Jitter
|
Variance of inter packet RTT delay
|
Default: unchecked
|
No. of Packets to send
|
Packet count to send for the session to measure latency.
To calculate jitter (inter packet delay variance), more than 1 packet has to be sent.
|
1 -5 packets
(Default: 1 packet)
|
Click
Finish
after a successful verification and to enter the settings.
DETAILED STEPS
Step 1 From the Feature Selector pane, choose
Network Analysis > Path Latency Monitoring (PONG)
.
The Summary pane appears in the Contents pane.
Step 2 Right-click a session and choose
Go To Statistics
in the context menu.
The statistics for the session appear as a chart and a table of detailed information in the Details pane.
Step 3 In the Details pane, click the Path Latency tab to display RTT information about each path.
Step 4 In the Details pane, right-click to display a context menu of additional statistical displays:
-
Path specific switching delay–Switching delay of all the switches traversed in each path.
-
Path specific link delay–Link delay at each hop traversed in each path.
-
Switching delay of each switch across different paths traversed in the session.
-
Link delay of each link across different paths traversed in the session.
Step 5 In the Details pane, click the
Session Report
tab to display overall statistical information about the session.
The information can be exported as an Excel .xls file by cllicking the export button near the top of the table.