Configuring an
ATM LAN Emulation Client (LEC)
To configure the ATM logical interface as a LAN emulation client (LEC),
refer to the ATM LEC Configuration section of the window and perform the following
procedure.
Procedure:
Step |
Action |
1 |
By default, the interface PHY type is set
to Sonet. To view the Sonet configuration, click Sonet. |
2 |
To enable or disable this ATM logical
interface, select enable or disable from the drop-down box next to the Interface field. |
3 |
Select the configuration mode for identifying the LES address, either manual or
automatic. |
4 |
For manual mode, enter the LES server address. This is the address of
the LAN Emulation Server (LES) responsible for the ELAN to which the LEC connects. The
address has 3 parts:
- Address Prefix
- MAC Address
- ATM Address Selector
Note: The LES address must be
entered using the hexadecimal value. |
5 |
Select the maximum frame size from the drop-down box. You can set the maximum
frame size to either 1516 octets or 4544 octets. The default VNswitch LEC maximum
frame size is 1516 octets. Note:
ELAN services require that the maximum frame size is the same for all LECs belonging to a
specific ELAN. All LECs that are members of an ELAN participate in a negotiation
process to determine the maximum frame size used on the ELAN. The value set on the
LEC should not exceed the Maximum Frame Size set on the LES.
Caution: Changing to a larger frame
size causes the module to restart. |
6 |
In the Max Unkwn Frame Time field, specify
the time period within which the maximum number of unknown frames is not to be exceeded.
The range of acceptable values is 1 to 60 seconds. |
7 |
In the Control Timeout field, specify the
maximum amount of time the LEC waits for a response after sending a request. The range of
acceptable values is 10 to 300 seconds. If this value is exceeded, the LEC issues
another request. |
8 |
In the Max Retry Cnt field, enter the
number of times the LEC attempts to resend an LE ARP
Request when the ARP Response Time is exceeded. |
9 |
In the Aging Time field, enter the number
of seconds each entry in the LE ARP cache is
retained. The range of acceptable values is 10 to 300 seconds. |
10 |
In the ARP Response Time field, enter the
number of seconds within which the transmitting LEC expects to receive an LE ARP response after it sends and LE ARP
Request. The range of acceptable values for this parameter is 1 to 30 seconds. If
the length of time it takes for the transmitting LEC to receive a response equals or
exceeds the value entered here, the LEC initiates a retry. |
11 |
In the ELAN Name field, enter the the name
of the ELAN with which you want to associate (join) the LEC. Typically, a list of valid
ELAN names is created by the LAN Emulation Configuration Server (LECS) network
administrator. If you do not identify which ELAN the LEC should join, the LECS directs
the connection to a default ELAN compatible with the requirements of the interface. |
12 |
In the Max Unkwn Frame Cnt field, specify
the maximum number of unknown frames sent to the BUS.
The range of values is 1 to 10. |
13 |
In the VCC Timeout field, set the maximum
amount of time (in minutes) that a Data Direct VCC is allowed to be inactive (no data
frame traffic is transmitted or received). If the VCC timeout value is exceeded, the
VNswitch LEC interface releases the VCC. |
14 |
In the Path Swtch Delay field, enter the
number of seconds after which an LEC assumes a data frame it transmits is either delivered
to its destination, or discarded. The range of acceptable values is 1 to 8 seconds. |
15 |
In the Frwrd Dly Time field, enter the
number of seconds each entry in the LE ARP cache
is retained when a topology change is in progress. The range of acceptable values is
4 to 30 seconds. |
16 |
In the Flush Timeout field, enter the
maximum amount of seconds the LEC waits to receive an LE Flush Response after it sends a request. The range of
acceptable values is 1 to 4 seconds. The default is 4 seconds. |
Configuring a Bridge Tunnel
To configure the ATM logical interface as a bridge tunnel, specify a VCI
and click Change to Bridge Tunnel, then click the Help button within the ATM Bridge
Tunnel Configuration and Status window.
Redirecting the ATM Physical Interface to the
Backplane
The ATM port (the physical ATM interface) can be redirected to the
backplane of a MultiSwitch 900. This is referred to as ATM on the backplane. For instructions on how to redirect the ATM port
to the backplane, refer to the MultiChassis Manager help files.
Note: The
MultiChassis Manager is a component of the DIGITAL clearVISN network management product.
This product must be installed on your network before you can redirect the ATM port to the
backplane.
Performing Other ATM Interface Configuration Tasks
Use the CLI to perform the following optional ATM interface configuration
tasks:
Setting the ATM Transmission Type
to Synchronous Digital Hierarchy (SDH)
SDH is the frame format most commonly used in European countries. By default, the
transmission type is set to Syncrhonous Optical Network (SONET), the frame format most
commonly used in the United States.
Manually Setting the ATM
Transmission Timing
Transmission and receipt of SONET or SDH frames must be synchronized between the VNswitch
ATM interface and the other devices with which the module communicates. The timing can be
based on the system clock of the VNswitch module, or it can be based on the system clock
of another device on the network. By default, transmission timing is based on the system
clock of the VNswitch module.
Disabling or Enabling Payload
Scrambling
Payload scrambling is a function used to help ensure data integrity at the level of the
SONET or SDH payload envelope. By default, payload scrambling is enabled. If
the VNswitch module is to communicate with a DIGITAL GIGAswitch/FDDI AGL2, you must
disable payload scrambling.
Field Descriptions
Status |
MAC
Type |
Frame type used by the ATM LEC.
The frame type is always Ethernet. |
ELAN
Name (Configured) |
Name of the ELAN with which the
LEC is associated. |
ATM
address |
ATM address for this ATM
logical interface. |
LEC
Status |
Displays LEC port status. |
ELAN
Name (Joined) |
Name of the ELAN with which the
LEC is associated. |
Statistics |
LE Arp Request
Sent |
Number of LE ARP Requests sent by this LEC. |
LE Arp Request
Received |
Number of LE ARP Requests received by this
LEC. |
LEC Control
Frames Sent |
Number of LEC control frames sent by this
LEC. |
LEC Control
Frames Received |
Number of LEC control frames received by
this LEC. |
LEC Illegal
Control Frames Received |
Number of illegal LEC control frames
received by this LEC. |
Virtual Circuits |
Ifc |
Logical interface number associated with
the interface. |
VPI |
Lists the Virtual Path Indentifier (VPI)
associated with the interfaces listed in the Ifc column. |
VCI |
Lists the Virtual Circuit Identifers (VCIs)
associated with the interfaces listed in the Ifc column. |
Type |
Indicates the type of virtual circuit, such
as ILMI VC, LE Control VC, and so forth. |
S/PVC |
Indicates whether the circuit is a switched
virtual circuit (SVC) or a permanent virtual circuit (PVC). |
ATM Address
|
ATM address of the corresponding logical
interface listed in the Ifc column. |
ATM LEC Configuration |
PHY Type
|
PHY layer type. |
Interface |
Specifies whether the interface is enabled
or disabled. |
Config
Mode |
Specifies whether the LES address is
configured automatically or manually. |
LES Server
Address for Manual Mode |
Specifies the address of the LAN Emulation
Server (LES). |
Max Frame Size
|
Maximum data frame size the LEC can send on
a Multicast Send VCC, or receive on the Multicast Send VCC or the Multicast Forward VCC.
This parameter also specifies the maximum frame size for all LEC Data Direct VCCs. Note: ELAN services require that the maximum frame
size is the same for all LECs belonging to a specific ELAN. All LECs that are
members of an ELAN participate in a negotation process to determine the maximum frame size
used on the ELAN. The value set on the LEC should not exceed the Maximum Frame Size set on
the LES. |
Max Unkwn Frame
Time |
Period within which the maximum number of
unknown frames is not to be exceeded. |
Control
Timeout |
Timeout value of LECS and LES requests. |
Max Retry Cnt
|
Maximum number of times the LEC may attempt
to resend an LE ARP Request when the ARP Response Time is exceeded. |
Aging Time |
Length of time entries in the LE ARP cache
are retained under normal operation. |
ARP Response Time |
Maximum amount of time, in seconds, the LEC
waits before retrying a LE ARP Request. |
ELAN Name |
Name of the ELAN with which the LEC is
associated. |
Max Unkwn Frame
Cnt |
Maximum number of unknown frames that an
LEC can send to the BUS within the time period specified by the Max Unkwn Frame Time
value. |
VCC Timeout |
Maximum amount of time a Data Direct VCC is
inactive (no data frame traffic is transmitted or received) before the VCC is released. |
Path Swtch Delay |
Period of time after which the LEC assumes
a transmitted data frame has been delivered to its destination or discarded. |
Frwrd Dly Time |
Length of time entries in the LE ARP cache
are retained when a topology change is in progress. |
Flush Timeout |
Length of time, in seconds, the LEC waits
to receive an LE Flush Response after it sends a request. |
|