1. Home
    2. /
  2. Manuals
    3. /
  3. Zyxel
    4. /
  4. P-870HN-51b
    5. /
  5. 54
Page 266 / 382 Scroll up to view Page 261 - 265
Chapter 26 Diagnostic
P-870HN-51b User’s Guide
266
•
Loopback test - checks if the MEP port receives its Loop Back Response (LBR)
from its target after it sends the Loop Back Message (LBM). If no response is
received, there might be a connectivity fault between them.
•
Link trace test - provides additional connectivity fault analysis to get more
information on where the fault is. If an MEP port does not respond to the source
MEP, this may indicate a fault. Administrators can take further action to check
and resume services from the fault according to the line connectivity status
report.
26.3
The General Diagnostic Screen
Click
Maintenance > Diagnostic
to open the screen shown next. Ping and
traceroute help check availability of remote hosts and also help troubleshoot
network or Internet connections.
Figure 151
Maintenance > Diagnostic > General
Page 267 / 382
Chapter 26 Diagnostic
P-870HN-51b User’s Guide
267
26.4
The following table describes the fields in this screen.
The 802.1ag
Screen
Click
Maintenance > Diagnostic
>
8.2.1ag
to open the following screen. Use
this screen to perform CFM actions.
Figure 152
802.1ag
The following table describes the fields in this screen.
Table 97
Maintenance > Diagnostic > 802.1ag
LABEL
DESCRIPTION
802.1ag
Connectivity
Fault
Management
Maintenance
Domain (MD)
Name
Type a name of up to 39 printable English keyboard characters for this
MD.
The combined length of the MD Name and MA name must be less or
equal to 44bytes.
Page 268 / 382
Chapter 26 Diagnostic
P-870HN-51b User’s Guide
268
Maintenance
Domain (MD)
Level
Select a level (0-7) under which you want to create an MA.
Maintenance
Association (MA)
Name
Type a name of up to 39 printable English keyboard characters for this
MA.
The combined length of the MD Name and MA name must be less or
equal to 44bytes.
Maintenance
Association (MA)
Format
Select the format which the Device uses to send this MA information in
the domain (MD). Options are
VID
,
String
and
Integer
.
If you select
VID
or
Integer
, the Device adds the VLAN ID you
specified for an MA in the CCM.
If you select
String
, the Device adds the MA name you specified
above in the CCM.
Note: The MEPs in the same MA should use the same MA format.
Destination MAC
Address
Enter the target device’s MAC address to which the Device performs a
CFM loopback test.
Count
Set how many times the Device send loopback messages (LBMs).
802.1Q VLAN ID
Type a VLAN ID (0-4095) for this MA.
Maintenance End
Point ID
Enter an ID number (1-8191) for this MEP port. Each MEP port needs a
unique ID number within an MD. The MEP ID is to identify an MEP port
used when you perform a CFM action
Status
Continuity Check
Message (CCM)
This shows how many Connectivity Check Messages (CCMs) are sent
and if there is any invalid CCM or cross-connect CCM.
Loopback
Message (LBM)
This shows how many Loop Back Messages (LBMs) are sent and if
there is any inorder or outorder Loop Back Response (LBR) received
from a remote MEP.
Linktrace
Message (LTM)
This shows the destination MAC address in the Link Trace Response
(LTR).
Save
Click this to save your changes back to the Device.
Enable CCM
Click this button to have the selected MEP send Connectivity Check
Messages (CCMs) to other MEPs.
Disable CCM
Click this button to disallow the selected MEP to send Connectivity
Check Messages (CCMs) to other MEPs.
Update CC status
Click this button to reload the test result.
Send Loopback
Click this button to have the selected MEP send the LBM (Loop Back
Message) to a specified remote end point.
Send Linktrace
Click this button to have the selected MEP send the LTMs (Link Trace
Messages) to a specified remote end point.
Table 97
Maintenance > Diagnostic > 802.1ag (continued)
LABEL
DESCRIPTION
Page 269 / 382
Chapter 26 Diagnostic
P-870HN-51b User’s Guide
269
26.5
The OAM Ping Test Screen
Click
Maintenance > Diagnostic > OAM Ping Test
to open the screen shown
next. Use this screen to perform an OAM (Operation, Administration and
Maintenance) F4 or F5 loopback test on a PVC. The Device sends an OAM F4 or F5
packet to the DSLAM or ATM switch and then returns it to the Device. The test
result then displays in the text box.
ATM sets up virtual circuits over which end systems communicate. The
terminology for virtual circuits is as follows:
Figure 153
Virtual Circuit Topology
Think of a virtual path as a cable that contains a bundle of wires. The cable
connects two points and wires within the cable provide individual circuits between
the two points. In an ATM cell header, a VPI (Virtual Path Identifier) identifies a
link formed by a virtual path; a VCI (Virtual Channel Identifier) identifies a
channel within a virtual path. A series of virtual paths make up a virtual circuit.
F4 cells operate at the virtual path (VP) level, while F5 cells operate at the virtual
channel (VC) level. F4 cells use the same VPI as the user data cells on VP
connections, but use different predefined VCI values. F5 cells use the same VPI
and VCI as the user data cells on the VC connections, and are distinguished from
data cells by a predefinded Payload Type Identifier (PTI) in the cell header. Both F4
flows and F5 flows are bidirectional and have two types.
•
segment F4 flows (VCI=3)
•
end-to-end F4 flows (VCI=4)
•
segment F5 flows (PTI=100)
•
end-to-end F5 flows (PTI=101)
OAM F4 or F5 tests are used to check virtual path or virtual channel availability
between two DSL devices. Segment flows are terminated at the connecting point
•
Virtual Channel (VC)
Logical connections between ATM devices
•
Virtual Path (VP)
A bundle of virtual channels
•
Virtual Circuits
A series of virtual paths between circuit end points
Virtual Path
Virtual Channel
Segment
ATM Switch
Virtual Circuit (End-to-End)
Page 270 / 382
Chapter 26 Diagnostic
P-870HN-51b User’s Guide
270
which terminates a VP or VC segment. End-to-end flows are terminated at the end
point of a VP or VC connection, where an ATM link is terminated. Segment
loopback tests allow you to verify integrity of a PVC to the nearest neighboring
ATM device. End-to-end loopback tests allow you to verify integrity of an end-to-
end PVC.
Note: The DSLAM to which the Device is connected must also support ATM F4 and/or
F5 to use this test.
Note: This screen is available only when you configure an ATM layer-2 interface.
Figure 154
Maintenance > Diagnostic > OAM Ping Test
The following table describes the fields in this screen.
Table 98
Maintenance > Diagnostic > OAM Ping Test
LABEL
DESCRIPTION
Select a PVC on which you want to perform the loopback test.
F4 segment
Press this to perform an OAM F4 segment loopback test.
F4 end-end
Press this to perform an OAM F4 end-to-end loopback test.
F5 segment
Press this to perform an OAM F5 segment loopback test.
F5 end-end
Press this to perform an OAM F5 end-to-end loopback test.

Rate

3.5 / 5 based on 2 votes.

Popular Zyxel Models

Famous Router IPs
Famous Router Companies
Bookmark Our Site

Press Ctrl + D to add this site to your favorites!

Share
Top