Source routing (network drivers)
Token-ring and FDDI source routing is supported
for
MDI
network drivers running on SVR5 and SCO OpenServer 5.
It is implemented in the
DLPI
module rather than in a separate STREAMS module.
The cet, tok,
trps, and wwdw drivers
provide this capability.
The FDDI drivers skfp and dfx
can be configured to use source routing
although generally source routing
is not used on FDDI networks.
The user can disable source routing,
thus keeping all traffic confined to the local ring:
-
Run netcfg on SVR5
or netconfig on SCO OpenServer 5
go into Advanced Options.
-
Set the NETxSRSRMODE parameter
to 0 (None) rather than the default 1 (Auto).
This parameter can also be set through
the system tuner application
but netcfg and netconfig
do not display the correct information
if you do this.
Additional tunable parameters for source routing
can be set in the same way.
The full list of tunables is:
SRTXRESP-
Timeout for responding to rx, in seconds.
This is used with Spanning Tree Explorer frames.
SRRXARE-
Window for rejecting more AREs, in seconds.
This is used with All Routes Explorer (ARE) frames
and Specifically Routed Frames (SRF).
SRRXSTEBCS-
Number of Spanning Tree Explorer frames bcs
before invalidating the route entry and finding new route.
When this number of STE bcs
and SRF tx pairs occur,
the route is removed and an ARE is sent
if AREs are enabled;
otherwise, an STE is sent.
SRRXSTEUCS-
Number of STE ucs sent before the route entry is invalidated
and another route is found.
If the count of STE ucs received
with no intervening SRFs exceeds this value,
the route is dropped.
SRMAXTX-
Upper limit, in seconds, for tx ``recur'' window.
SRMINTX-
Lower limit, in seconds, for tx ``recur'' window.
SRTXRECUR-
Detected ``recurs'' before transmitting an STE .
Note that this statistic is incremented
only when the event is within the window bounded by
the SRMINTX and SRTXRECUR values.
SRAREDISAB-
If set to 0 (default),
ARE frames are enabled.
If set to 1, ARE frames are disabled.
Disabling AREs can reduce network utilization.
SRSRMODE-
Valid values are:
0-
Disable source routing;
all traffic is confined to the local ring.
1-
(default)
The routing information field is automatically interpreted
and routing entries and frame headers are set up as needed.
2-
The DLS user will manually provide
the source routing information.
SRMAXROUTE-
Maximum number of routes cached by
the source routing subsystem.
The SCO implementation of source routing
provides transparent routing
even for protocols that are source routing unaware
such as SCO's TCP/IP and IPX.
It also enables protocol stacks
to utilize their own stack-based source routing
with an SRMODE_REQ message.
© 2005 The SCO Group, Inc. All rights reserved.
OpenServer 6 and UnixWare (SVR5) HDK - June 2005