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Configure X.25 over Other Protocols 221
Table 268 Configure PVC XOT switching
5 Configure Keepalive and xot-source attributes
After the TCP link is established, TCP will not be easily cleared even if the link is
disconnected. But after configuring Keepalive, the router will send checking
packets in time to check the usability of the link. If it cannot get confirmation after
sending out packets several times, it will consider the link failure and clear it
automatically.
Table 269 Configure Keepalive and xot-source attributes
Configure X.25 over
Frame Relay (Annex G)
Configure Annex G Data Interoperation
ANSI T1.617 Annex G defines how to transmit X.25 packets over Frame Relay
DCLIs. With the integrated acknowledgement, retransmission and flow control
mechanisms of X.25, Annex G DLCI can provide reliable transmission service, as
well as interconnect X.25 networks via Frame Relay networks. Annex G is a
stopgap between X.25 network and Frame Relay network, which can effectively
protect the investment that the user has made.
This section covers how to make configurations so that Annex G DLCI can be used
to transmit IP data. For the configurations of X.25 switching over Annex G DLCIs,
refer to the subsequent section.
Table 270 Configure an Annex G DLCI
Annex G DLCI does not support IARP (Inverse Address Resolution Protocol), so the
user should configure a static map between the destination IP address and the
Frame Relay address.
Operation Command
Add a PVC XOT route x25 xot pvc pvc-number ip address
interface type number
Delete a PVC XOT route undo x25 xot pvc pvc-number
Operation Command
Configure SVC Keepalive and
xot-source attributes
x25 switch svc x.121-address [ sub-dest
destination-address ] [ sub-source
source-address ] xot ip-address1 [
ip-address2 ] … [ ip-address6 ] [
xot-option ]
Configure PVC Keepalive and
xot-source attributes
undo x25 switch svc x.121-address [
sub-dest destination-address ] [
sub-source source-address ] [ xot
ip-address1 [ ip-address2 ] … [
ip-address6 ] ] [ xot-option ]
Operation Command
Configure a Frame Relay interface link-protocol fr
Configure an IP address for the interface ip address { A.B.C.D } { A.B.C.D }
Configure a Frame Relay DLCI fr dlci dlci-number
Configure the Frame Relay DLCI to be Annex
G DLCI
annexg { dce | dte }
Map the Frame Relay address to the
destination IP address
fr map ip { A.B.C.D } {
dlci-number }