AI2524 Router Card User’s Manual
Page 12-6 August 1997
2524UM
Set the Default Flow Control ValuesBecause X.25 is a strongly flow-controlled protocol, setting correct
default flow control parameters for window size and packet size is es-
sential. Mismatched default flow control values will cause X.25 local
procedure errors, evidenced by Clear and Reset events.
To configure flow control parameters, complete these tasks. Thes
tasks are optional if your X.25 attachment uses the standard default
values for maximum packet sizes (128 bytes incoming and outgoing
and window sizes (2 packets incoming and outgoing).
zSet Default Window Sizes
zSet Default Packet Sizes
Note: Because the X.25 protocol requires the DTE and DCE to
have identical default maximum packet sizes and default
window sizes, changes made to the window and packet
sizes when the interface is up are held until the X.25 pro-
tocol restarts the packet service.
Set Default Window SizesX.25 networks have a default input and output window size (the preset
value is 2) that is defined by your network administrator. You must set
the Cisco IOS software default input and output wi ndow sizes to match
those of the network. These defaults are the values that an SVC uses if
it is set up without explicitly negotiating its window sizes. PVCs also
use these default values unless d ifferent values are configured.
In interface configuration mode, set the default window sizes:
1. Set the default virtual circuit receive window size.
x25 win
packets
2. Set the default virtual circuit t ransmit window size.
x25 wout
packets
Set Default Packet SizesX.25 networks have a default maximum input and output packet siz
(the preset value is 128) that is def ined by your netwo rk ad ministrator.
You must set the Cisco IOS software default input and output maxi-
mum packet sizes to match those of the network. These defaults are the
values that an SVC uses if it is set up without explicitly negotiating its