Cabletron Systems Netlink FRX8000, User Manual

Page: 89 / 468

Configuring Inter-Nodal Trunks 7-9
Logical Trunk Parameters
Underlying Physical Port
is the physical X.25 or frame relay port (whose record must be configured first) on
which this logical port is being configured.
Calling Address
identifies the local end of the logical trunk. A record for this address must exist in the
Subscriber file (see
page 7-18 ), with the local logical port specified as the only routing
path.
Called Address
identifies the remote end of the logical trunk. A record for this address must exist in
the Subscriber file, with the remote logical port specified as the only routing path.
Number of Circuits
is the number of “paths” on the single logical trunk over which traffic will be trans-
mitted in parallel, using different LCNs. This provides an effective window size larger
than a single channel would supply.
If the remote end of the trunk will be an N74/7500,
Number of Circuits
must be
1
. Mul-
tiple channels must be configured as separate logical ports (X.25 trunks on the
FRX8000, PDN on the N74/7500), each identified by a unique address.
PVC
specifies whether this logical trunk is one end of a PVC to the underlying physical
X.25 port. If
Y
, a PVC Connection record (see page 7-20 ) must be created for each
circuit (determined by
Number of Circuits
) on this logical trunk. (Configure each PVC
type as
X.25 Trunk
.)
Mapped DLCI Number
is the Data Link Connection Identifier, a routing ID that assigns a frame to a particular
logical connection. This ID is used only locally, and the DLCI can be different at each
end of a logical connection.
Make sure that no more than one of any interface type (logical
port or frame relay IP/IPX/LLC2 interface) is assigned the same
DLCI.
Connection Priority
allows setting a priority for this logical connection relative to others on the physical
link; the higher the number, the higher the priority.
Backup Trunk Parameters
This Trunk a Backup
specifies whether the current trunk is backing up one or more other trunks on the same
node. A trunk specified as backup remains out of service if all trunks it is backing up
are operational; therefore, do not configure two trunks as backups for each other.
At node IPL, all trunks that are not backups are activated. Any backup trunks begin in
a disabled state; however, they can accept requests for connection from the other end.
When the node determines that one of its trunks is down, it activates any backup trunk