Cabletron Systems Netlink FRX8000, Руководство пользователя

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Configuring X.25 9-19
When Changes Take Effect
When you add a new PVC record, the change will be written to the database as soon
as you enter the final parameter value. When you modify a parameter in an existing
record, the change will be written to the database instantly.
The virtual connection will be established when the nodes at both ends undergo
re-IPL. If you want to establish a connection without disrupting node operation, create
an identical PVC on line. Press
[D] at the Operations Menu (or [B], [D] from the Main
Menu) and enter the requested information, noting the values in Table 10-5. (This is
described in greater detail under "
Creating/Deleting a PVC On Line" on page 9-20.)
PVC Parameters
Explanations follow the table. Note that parameters labeled in a record as Primary or
Secondary identify each end of the connection. (It does not matter which end is
which.)
1
Logical channels must be lower than the lowest LCNs assigned to any subscribers on the
ports in a PVC record.
2
16, 32, 64,128, 256, 512, 1024, 2048
,
or 4096 . Cannot be greater than the smaller
Maxim um Packet Size
specified in the Port records for both ends of the connection.
3
Cannot be greater than the smaller
Maxi mum Window Siz
e specified in the Port records
for both ends of the connection.
Bandw. Alloc. Group
is a method of prioritizing outgoing traffic over the trunk. Each IP and IPX network
interface, SVC Subscriber, and PVC is assigned to a trunk allocation group defined by
a
Percent of Bandwidth value ( 1–100 ) and a Priority ( 0–9 ) specified in the Network
Defaults file. (See “ Configuring Bandwidth Allocation Groups ” on page 8-2.)
Primary/Secondary Logical Channel
is a logical link between the node and each subscriber. The physical line may have a
number of logical channels. An LCN assigned to a port in a PVC record must be lower
than the lowest LCN specified for any SVC subscriber on the same port.
Table 10-5 X.25-to-X.25 PVC Parameters
Parameter Valid Values Default Value
PVC Type 0 ( X.25-to-X.25 ) 0
Bandw. Al loc. Group 1–3 1
Node 1–250
local node
LP 0–7 0
Por t 0–63 0
Logical Port Num ber ( N74/7500 PDN ) 8–63 8
Primary/ Secondary Logi cal Channel 1–4095
1
1
Primary/ Secondary Subscriber Name
0–24 characters none
Primary/ Secondary Packet Size 16–4096
2
128
Primary/ Secondary Wi ndow Size 1–7
3
2