Installation manual

Part No. T0001-43, Rev B
February, 2003
Known Software Limitations Page 49 of 99
Large SDLC-to-LLC2 (SLAC) Calling Addresses - All Products
For incoming X.25 calls over Frame Relay SVC, Vanguard network services updates
the X.25 table with calling address and station ID, interpreting the calling address as
XX...X**. That is, the last two digits are assumed to be sub address and the rest as
node address. For calls using large sub addresses, such as SDLC SLAC station calls,
this leads to a wrong node address. For example, a calling address of 2000822, where
0822 is the sub address, is interpreted as 20008** with 22 as the sub address.
(DRFaa16491)
Workaround: The sub address must be two digits long, or X.25 calls should be made
in one direction only.
Vanguard 7330 Data Buffer Performance
When the number of Data Buffers used reaches a level above the configured WAN
congestion start blocking threshold (default of 89 percent), the throughput of the
node may drop to a very low level until the steady state buffer utilization drops
below the configured stop blocking WAN congestion threshold (default of 86
percent). A number of factors effect the number of buffers used, including the
number of SVCs used and the rate of data transfer through the node. (DRFaa16497)
Workaround: Reduce number of connections (SVCs) or traffic through node in order
to reduce number of buffers used.
V.34 Modem Calls not Connecting - Vanguard 6560, 6400 and 7300
V.34 Modem calls do not consistently connect over Autocall and Transparent
connection types. (DRCaa22907)
Workaround: At present, there is no workaround.
Virtual Links between two OSPF Area Border Routers Fail - Vanguard
7300 Series
Virtual links between two OSPF Area Border Routers do not work properly.
(DRFaa17076)
Workaround: At present, there is no workaround.
Voice Server Card Removal - Vanguard 7300 Series
If the voice server card is removed from the T1 card and there is a voice
configuration in the node, the node will not boot. (DRCaa22978)
Workaround: Delete the voice configuration or default the node before removing the
voice server card.
BGP Global TCP Segment Size and Peer TCP Segment Size
Vanguard 6560
The Global TCP segment size is overriding peer TCP segment size if any one peer is
configured for zero. (DRFaa19391)
Workaround: At present, there is no workaround.
Voice Port Loopback Test Output Level - Vanguard 340 and 6400 Series
The local voice port loopback test does not display the correct output level.
(DRCaa23032)
Workaround: At present, there is no workaround.