Verifying the configuration
The virtual circuit configured in this example is an SVC. The routers establish it only when they need
to communicate.
# Ping Router B from Router A.
[RouterA-Serial2/0] ping 202.38.60.2
PING 202.38.60.2: 56
Reply from 202.38.60.2: bytes=56 Sequence=1 ttl=255 time=33 ms
Reply from 202.38.60.2: bytes=56 Sequence=2 ttl=255 time=27 ms
Reply from 202.38.60.2: bytes=56 Sequence=3 ttl=255 time=26 ms
Reply from 202.38.60.2: bytes=56 Sequence=4 ttl=255 time=26 ms
Reply from 202.38.60.2: bytes=56 Sequence=5 ttl=255 time=26 ms
--- 202.38.60.2 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 26/27/33 ms
The output shows that the SVC has been established between the two routers.
# Display the X.25 address mapping table on Router A.
[RouterA-Serial2/0] display x25 map
Interface: Serial2/0(protocol status is UP)
ip 202.38.60.2
Map-type: SVC_MAP
Facility:
# Display X.25 virtual circuit information on Router A.
[RouterA-Serial2/0] display x25 vc
Interface: Serial2/0
SVC 1024
State: P4(transmit)
Map: ip 202.38.60.2 to 20112452
Window size: input 5
Packet Size: input 1024
Local PS: 5
Local Busy: FALSE
Input/Output:
DATA 5/5
RR 0/0
Bytes 420/420
Send Queue(Current/Max): 0/200
Direct connection of two routers connecting through serial
interfaces (two address mappings)
Network requirements
As shown in
serial interfaces over the X.25 link layer protocol. Two IP to X.121 mappings are available on Router
A.
data bytes, press CTRL_C to break
X.121 address:20112452
VC-number: 1
output 5
output 1024
Local PR: 5
Reset times: 0
INTERRUPT 0/0
RNR 0/0
REJ 0/0
Figure
137, two routers are connected directly; IP packets can be transmitted between
Remote PS: 4
Remote PR: 5
346
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