PPP channel configuration
27
Models 3224 G.SHDSL IpDSLAM & 6081RC NAS Applications Guide
3 • Bridged data application
– The
Submit
button saves changes made to a bridge configuration.
5. Type a short description for Bridge 1 in the
Description
text box.
6. Aging time is the number of seconds a MAC-address will be held in the forwarding database after receiving
a packet from this MAC address. The entries in the forwarding database are periodically timed out to
ensure they won’t stay around forever. If desired, type a value (in seconds) for the forwarding table aging
time in the
Aging Time
box. The default value for this setting is 300 seconds (5 minutes).
7. The 3224 and 6081RC periodically check the forwarding database for timed-out entries which are then
deleted. The
Garbage Collection Interval
is the time (in seconds) that between each checks of the forward-
ing database.
8. Spanning tree is a link management protocol that provides path redundancy while preventing undesirable
loops in the network. For a Layer 2 Ethernet or Token Ring network to function properly, only one active
path must exist between two stations. Spanning-tree operation is transparent to end stations, which cannot
detect whether they are connected to a single LAN segment or a switched LAN of multiple segments.
If you will not be enabling Spanning Tree options, go to step 9. Otherwise, click the
Enable Spanning Tree
box to activate Spanning Tree Options. The following options are available for configuration:
–
Priority
: The switch with the highest bridge priority (the lowest numerical priority value) is elected as
the spanning-tree root switch, which is the logical center of the spanning-tree topology in a switched
network. If all switches are configured with the default priority (32768), the switch with the lowest
MAC address in the Layer 2 network becomes the root switch. Under some circumstances, traffic pat-
terns may require that a different switch be assigned as the root switch than that which was chosen by
default. Increasing the priority by typing a number in the Priority box that is less than the default 32768
value forces the switch to become the root switch.
–
Forward Delay
: This value is the time a port will remain in the listening and learning states before enter-
ing the forwarding state.
–
Hello Time
: The amount of time a port will remain in the listening and learning states before entering
the forwarding state.
–
Max Message Age
: The length of time the switch will store protocol information received on a port.
9. Once all options have been entered, click the
Submit
button to save changes.
PPP channel configuration
The Models 3224 and 6081RC generate PPP channels to transport bridged (BCP) or routed (IPCP) data to
and from subscriber’s premises.
In the case of the Model 3224, PPP channels are created automatically and each channel is assigned to a
G.SHDSL port. For example PPP channel 1 is assigned to G.SHDSL port 1, PPP channel 2 is assigned to
G.SHDSL port 2, etc.
In the case of the 6081RC, a PPP channel is generated automatically only when the operator creates a H.110
channel. When an H.110 channel is created, it automatically receives a sequential ID number starting at 1.
Consequently, the corresponding PPP channel is also assigned the same ID number. For example, PPP Chan-
nel 3 is attached to H.110 channel 3.
