Bay Networks CLAM Manuel
ISSUE 4.0 MAN-CLAM-BRIDGE-ADDENDUM
CLAM BRIDGE
ADDENDUM
Issue 4.0
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All trade marks are acknowledged.
1996 Scorpion Logic Ltd. A Bay Networks company
MAN-CLAM-BRIDGE-ADDENDUM ISSUE 4.0
ADDENDUM
Page 1
1. INTRODUCTION
The purpose of this addendum is to document the changes introduced between
Release 3 and Release 4 software. This addendum should be read in conjunction
with the CLAM Bridge Reference Manual Issue 3.0 to provide a full description
of the configuration and operation of the CLAM Bridge.
2. REFERENCE
The new features that have been added to the bridge Release 4.xx software that
have resulted in management system screen changes are:
• support for the CLAM WAN option board
• non propagation of Banyan Vines routing packets to a ‘stub’ network
• static ARP for enhanced security
• restricted SAP learning mode for large Novell IPX networks
• enhanced TA configuration and information screens
• support for the integral U interface North American BRI ISDN TA
The sections listed below have been updated to reflect the changes to the
management screens.
• Port Management
• General Bridging Parameters
• Static ARP Configuration
• IPX SAP Filter Configuration
• ISDN TA Configuration
Information regarding the changes is detailed in the following pages.
ADDENDUM
Page 2
2.1 PORT MANAGEMENT
The port configuration screen displays a list of ports; LAN, WAN and ISDN that
have been detected by the unit. This screen is accessed by typing CO PO at the
command prompt.
N.CLAM.mmm SYSTEM NAME PORT CONFIGURATION
___________________________________________________________________________________
Page No. m of n
No. Name Type Phys. Rx(%) Tx(%) LZC(/) State
LAN1 LAN Port No. 1ETHERNET CSMA/CD 02.4 00.0 UP
ISDN1 TA Link 1BRIDGE TA ISDN 00.2 02.9 2.6 UP
ISDN2 TA Link 2 BRIDGE TA ISDN 58.7 12.6 3.8 UP
[WAN1 HDLC Link 1BRIDGE HDLC V.24 00.2 01.8 4.5 UP ]
EDIT - Edit Port TYPE -Change Port Type
___________________________________________________________________________________
^G - Main Menu
^L - Prev Menu
___________________________________________________________________________________
(co po) Enter command :
Figure 2.1 Ports List Screen
If a CLAM WAN is installed in the unit, it will be automatically detected and the
port will be displayed in addition to any other ports on the unit.
If a WAN port is available it should be configured with reference to one of the
following two sections 2.1.1 HDLC PORTS or 2.1.2 PPP PORTS.
ADDENDUM
Page 3
2.1.1 HDLC PORTS
N.CLAM.mmm SYSTEM NAME EDIT HDLC PORT
___________________________________________________________________________________
Port Number :WAN1 Demand Threshold : 50%
Port Name :HDLC Link 1 Demand Period : 10
STP Priority :128 Idle Threshold : 2%
Line Speed(bits/s):19200 Idle Period : 60
Compression :ENABLED Demand Priority : 0
Backup/Demand Mode:NONE Backup Priority : 0
Backup Bridge :002062009999 Backup Alert : ENABLED
Remote Unit Name :0923710254
___________________________________________________________________________________
^G - Main Menu
^E - Submit ^L - Prev Menu
___________________________________________________________________________________
Figure 2.2 HDLC Port Configuration Form
PORT
NUMBER The port number in the system. It is generated automatically
by the system and cannot be configured.
PORT NAME A name given to the port for ease of reference. It is not used
by the system, other than on management screens.
STP
PRIORITY Used by the Spanning Tree Algorithm, the path cost is used
to help calculate the unique root path through the network.
LINE SPEED
(BITS/S) This parameter should be set to the actual line speed at which
the interface is being clocked . Although the CLAM Bridge
does not generate clocks this parameter is used to configure
internal timers which optimise use of the link.
COMPRESS-
ION Data compression can increase the effective bandwidth of the
port typically between 2 and 8 times. The degree of
compression that can be achieved depends largely on the
format of the data being transferred and the speed of the link.
ADDENDUM
Page 4
DISABLED turns data compression off.
ENABLED allows the system to use its standard bandwidth
optimisation algorithm for compression. This should be used
on all links up to 256Kbps.
FAST should be used on links with speeds greater than 256
Kbps to maintain maximum throughput on the line. The
advantage of using compression depends on the data type and
line speed increases. You should monitor the effect of
turning compression on and off, particularly at line speeds
over 256Kbps.
BACKUP /
DEMAND
MODE
Specifies if Backup of this port and/or Bandwidth on
Demand is allowed when dial-up ports are available, e.g.
ISDN. Also specifies if EXPEDITED or NON-expedited
data will cause the system to dial up Backup and/or
Bandwidth on Demand when threshold values are reached
(see the following section for details of Expedited Protocols/
PROTOCOL PRIORITISATION).
NONE disables these options.
BACKUP allows the system to dial the Remote Unit Name
destination (see below) if the link fails.
DEMAND allows the system to dial up additional bandwidth
to support this link if the configured Demand Threshold
values are met (see below).
BOTH enables both BACKUP and DEMAND. If it is used,
you can set Backup Priority and Demand Priority (see
below).
EXP.DATA means that when Demand Threshold values are
met (see below), packets defined as EXPEDITEd in the Type
Filter Table will be sent by the first additional link dialled up.
ADDENDUM
Page 5
EXP+BKUP means that when Demand Threshold values are
met (see below), packets defined as EXPEDITEd in the Type
Filter Table will be sent by the first additional link dialled up.
It also allows the use of the BACKUP facility to dial the
Remote Unit Name destination (see below) if the usual link
fails.
NON-EXP.DATA means that when Demand Threshold
values are met (see below), packets defined as NON-
expedited in the Type Filter Table will be sent by the first
additional link dialled up.
NON-EXP+BKUP means that when Demand Threshold
values are met (see below), packets defined as NON-
expedited in the Type Filter Table will be sent by the first
additional link dialled up. It also allows the use of the
BACKUP facility to dial the Remote Unit Name destination
(see below) if the usual link fails.
REMOTE
UNIT NAME The name or ISDN number of the remote partner bridge,
unless the Backup/Demand Mode parameter is set to NONE.
Note: the name must be configured in the ISDN Numbers
configuration table.
BACKUP
BRIDGE Another bridge's dial-up ports may be used to BACKUP this
port. This provides 1-for-N backup of leased lines connected
to a number of bridges. The value specifies the MAC address
of the bridge used to place the backup call (which must be on
the same LAN).
Note: Bandwidth on Demand circuits can only be dialled up
from the same unit as the port requesting the additional
bandwidth. Dialup bandwidth by another bridge can only be
used for circuit backup purposes, i.e. when the original
circuit has failed.
ADDENDUM
Page 6
DEMAND
THRESHOLD Specifies the percentage loading on the link which must be
reached over the period of time in Demand Period (see
below) before dialled-up bandwidth is requested.
Each time this threshold is reached, additional bandwidth will
be requested. This means that a link can request multiple
connections to the same destination to add bandwidth.
Multicast and Broadcast frames are not included in loading
calculations, so additional bandwidth will not be dialled up
due to these frame types.
DEMAND
PERIOD The period (in seconds) over which bandwidth utilisation is
measured to determine whether the Demand Threshold has
been exceeded.
Over the Demand Period, more than Demand Threshold
percent of the link bandwidth must have been used before
additional bandwidth (if available) will be dialled up.
IDLE
THRESHOLD If the loading on a dialled-up bandwidth on demand
connection falls below this percentage, the additional
connection will be cleared.
Multicast and Broadcast frames are not included in loading
calculations, so connections will not be maintained if only
these frame types are present.
IDLE
PERIOD The period (in seconds) over which link loading is calculated
for comparison with the Idle Threshold. Over the Idle
Period, if less than Idle Threshold percent of the link
bandwidth has been used, the dialled-up link is cleared down.
An Idle Period that is too short may cause connections to be
dialled up and cleared before operation has stabilised, whilst
setting a value that is too high may leave the connection
established for longer than is needed. Therefore, careful
consideration should be given to the setting of this value.
ADDENDUM
Page 7
DEMAND
PRIORITY Dial-up connections can be used to provide bandwidth on
demand and backup of leased lines. This parameter
determines the priority of this port when using a dial-up
circuit for additional bandwidth.
Should this port require the use of a backup dial-up circuit
that is already in use, the Demand Priority will be compared
with the priority used by the port which is already using the
dial-up circuit. If the existing dial-up circuit is being used by
a higher priority request, the new request will be refused. If
it is lower, the dial-up circuit will be cleared and used for the
new request.
The original port may have requested the backup circuit for
backup or for additional bandwidth. Therefore, it is possible
to establish a priority hierarchy for ports which may be using
backup circuits for either reason. The higher the number, the
higher the priority.
BACKUP
PRIORITY Determines the priority of this port when using a dial-up
circuit for backup purposes. Operation is identical to that
described for Demand Priority.
BACKUP
ALERT Reserved for future use.
ADDENDUM
Page 8
PROTOCOL PRIORITISATION
Local Area Networks can support many different types of protocols, each with
different transmission characteristics and requirements. It is possible for one
protocol to adversely affect other protocols on the LAN by taking too much
bandwidth.
This problem is made worse by inserting a remote bridge link, due to the lower
speed of the link compared to the LANs at either end. One solution is to provide
extra bandwidth overall, but this rarely cures the problem as more and more
bandwidth is consumed by the bandwidth-hungry protocol. Another method is to
give one protocol (the Expedited Protocol) priority over the others, so that it can
transmit its packets without interference.
Protocol Prioritisation means that Expedited Protocols have priority over any
other protocols transported by the bridge. This ensures that one or more user data
streams are not affected by other data streams that take a lot of bandwidth. In
addition, Bandwidth on Demand and/or Backup can be allocated to either
EXPEDITED or NON-expedited (normal) data. Please see the following menu
screens and forms:
1. TYPE FILTERS (command: CONF BRID TYPE)
2. FILTER PARAMETERS (command: CONF BRID PARA)
3. PORT CONFIGURATION (command: CONF PORT EDIT).
• If only one leased circuit is available (without Bandwidth on Demand or
Backup), EXPEDITED data takes priority by about 3:1 over normal (NON-
expedited) data, i.e. for each normal packet that is sent, three EXPEDITED data
packets are sent.
• If two channels are available, the first carries normal data and the second carries
EXPEDITED data.
• If Bandwidth on Demand is enabled for EXPEDITED data, the Demand
Threshold applies to EXPEDITED data only. Only one ISDN channel can be
used for EXPEDITED data, no matter how the Demand Threshold parameters
are set up.
• If Bandwidth on Demand is enabled for normal data, the Demand Threshold
applies to normal data only. If normal data on the leased circuit is higher than
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