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16 Cisco IOS for S/390 Release 2.0 Release Notes
Documentation
TCP MINDEV and RTO Defaults Changed
Two of the defaults in the TCPCFG00 file have changed.
For the TCP statement, the MINDEV parameter defaults to 40 (0.10 second).
Also on the TCP statement, the RTO parameter defaults to 0; range 0 - 6000.
APPEND Keyword for LUPOOL Statement
In configuration member APPLUP00, a new keyword, APPEND has been added to the LUPOOL
statement.
LUPOOL NAME(pool_name)
APPEND(lu_name,...,lu_name)
Syntax Description
Example:
LUPOOL NAME(VLTPOOL0)
LU(T20000,T20001,T20002,T20003,T20004,T20005,T20006,T20007,T20008)
LUPOOL NAME(VLTPOOL0) APPEND
LU(T20010,>T20011,T20012,T20013,T20014,T20015,T20016,T20017,T20018)
CDLC Considerations
The 3746-900 unit is configured with a network MTU size, but will override it with the lowest MTU
size it encounters. That MTU size will be applied to whatever mainframe software will be running
next. Therefore, if a small MTU size is used, that will become the restriction for subsequent IP
packet sizes and may cause problems if fragmentation is not allowed. The CDLC MTU size should
correspond to its network configuration parameter.
Recommendations on Setting TOS
The following recommendations for setting TOS (type of service) have been added to the Cisco IOS
for S/390 Customization Guide.
When setting TOS, precedence bits should be set to zero.Of the next 4 bits, only one is to be set on
in any one packet: 16 = mindelay, 8 = max thruput, 4 = reliability, 2 = min cost. These should be set
as follows:
• Telnet = 16
• FTP Control = 16, Data = 8,
• SMTP Commands = 16, Data = 8
• DNS query = 16, zone transfer = 8
• SNMP = 4
• NNTP = 2
APPEND Specifies additional LU names for an LUPOOL. When APPEND is specified with
a previously defined NAME, the LU names specified are appended to that
previously defined for LUPOOL. There is no limit to the number of LUPOOL
statements that can be specified with the APPEND keyword. Duplicate LU name
checking is done for the complete list of LU names (original and appended).