Installation manual

Part No. T0001-43, Rev B
February, 2003
Known Software Limitations Page 42 of 99
Known Software Limitations
Introduction This section lists limitations known to exist in Release 6.2.R000 Applications Ware
software.
Vanguard 7300 Default Value for the W Window Packet Parameter
In release 6.1 the default value for the W Packet Window parameter for FRI AnnexG
station configuration has been changed from 2 to 7. When a 6.1 release software
loaded node is connected to a 6.0 release software loaded node is connected to each
other via FRI AnnexG with default settings, this causes mismatch in packet layer
window size and the connection does not work properly causing large delays or no
data going through. (DRFaa20377)
Workaround: This is a matter of mismatched configuration and setting the
W Packet Window parameter to be the same in the two nodes will allow the
connection to work properly.
RTP Header
Compression
RTP Header Compression Interoperability Between Cisco and
Vanguard Managed Solutions Products over Frame Relay Limitations
Incompatible Cisco Features- There are a few Cisco proprietary features that must be
disabled in order to ensure proper interoperability over Frame Relay links. The table
below identifies the incompatible features.
Protocols Not Supported - Vanguard Frame Relay links configured for CENCAP
encapsulation do not support Transparent Bridging traffic.
Configuration - The “Number of Session to be Compressed” parameter must not be
configured to a value greater than 255 when the encapsulation is configured to
“CENCAP”. Cisco products are limited to 8-bit Context Identifiers (CIDs) over
Frame Relay. Configuring a Vanguard node for more than 255 sessions will cause it
to use 16-bit CIDs.
Feature Comments
tcp header-compression Vanguard Managed Solutions products do not
support tcp header compression over Frame Relay.
TCP header compression must be disabled on
Cisco Frame Relay interfaces.
Frame relay end-to-end
keepalives
Encapsulation for keep alive packets is Cisco
proprietary and as a result is not supported on links
between Vanguard Managed Solutions and Cisco
nodes.
Cisco discovery protocol CDP must be disabled on links connected to
non-Cisco devices.