DDN classic instance (with annotation)

DDN settings

DDN (Digital Data Network) is a point-to-point synchronization Data communication link. it supports link layer communication protocols such as PPP, SLIP, HDLC, and SDLC. allows IP, Novell IPX, Bridging, CLNS, AppleTalk, DECnet, and other upper-layer protocols to run on it.

Basic Configuration
Compression Technology
E1 port configuration
Basic Configuration
Smart Command
Enter the specified port interface serial number
Define the port ip address ip-address mask
Specify the port packaging method encapsulation {PPP | HDLC}
Compression Technology

Generally, the data transmitted in the serial port is not compressed. It allows normal data headers to be exchanged during each transmission, but bandwidth is wasted each time. currently, the supported compression methods include PPP, FrameRelay, X.25, and TCP.
Cisco compression is completed through software and affects system performance. Therefore, we recommend that you use the showprocess cpu exec command to check the current cpu usage if the CPU usage of the vro exceeds 65%)

Smart Command
TCP transmission header compression ip tcp head-compression [passive]
X.25 compression X25 compress
PPP compression ppp compress [predictio| stac]
Note: "Passive" indicates that the output package is compressed only when the input package is compressed.

E1 port configuration

Both the Cisco 7000, 7500, and 2.048 series support the E1 (Mbps) Rate Interface. each E1 port can be divided into 30 64 K data lines and 2 signal lines by time slot. each of the 30 64 K data lines can be used as a 64 k leased line.

Smart Command
In configuration mode, define Controller E1 controller e1 slot/port
Define line code linecode {ami | hdb3}
Define character frame framing {crc4 | no-crc4}
Define the channel-group numbertimeslots range of the E1 group [speed {48 | 56 | 64}]
The specified serial port belongs to the channel-group interface serial.
Slot/port: channel-group
Note:
Slot/port ---- it is for the 7000 or 7500 series, so the slot and port number are differentiated.
Linecode ---- the default value is HDB3.
Framing ---- the default value is crc4, which must match the carrier's parameters.
Channel-group-each E1 can be divided into 30 channel-groups, corresponding to the channel-group and time slot. The channel-group is 0-30, and the timeslots is 1-31.
Interface serial ---- after defining E1 channel-group, we assign the group to a virtual serial port

3. Use the E1 line as an example to connect multiple 64 k leased lines.

Related commands:
Task commands
Enter controller Configuration Mode controller {t1 | e1} number
Select Frame Type framing {crc4 | no-crc4}
Select line-code type linecode {ami | b8zs | hdb3}
Establishes a logical channel group and time slot ing channel-group number timeslots range1
Show controllers e1 [slot/port] 2
Note: 1. when the link is T1, the channel-group number is 0-23, and the Timeslot range is 1-24. When the link is E1, the channel-group number is 0-30, timeslot range: 1-31.
2. Use show controllers e1 to observe the controller status. The following figure shows the normal status of controllers when the frame type is crc4.
Router # show controllers e1
E1 0/0 is up.
Applique type is Channelized E1-unbalanced
Framing is CRC4, Line Code is HDB3 No alarms detected.
Data in current interval (725 seconds elapsed ):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours) 0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
The following example shows how to connect three 64 k leased lines with a frame type of NO-CRC4 and a non-balanced link. The router configuration is as follows:
Shanxi # wri t
Building configuration...
Current configuration:
!
Version 11.2:
No service udp-small-servers
No service tcp-small-servers
!
Hostname shanxi
!
Enable secret 5 $1 $ XN08 $ Ttr8nfLoP9.2RgZhcBzkk/
Enable password shanxi
!
!
Ip subnet-zero
!
Controller E1 0
Framing NO-CRC4
Channel-group 0 timeslots 1
Channel-group 1 timeslots 2
Channel-group 2 timeslots 3
!
Interface Ethernet0
Ip address YYY.118.40.1 255.255.0.0
Media-type 10 BaseT
!
Interface Ethernet1
No ip address
Shutdown
!
Interface Serial0: 0
Ip address TTT.119.96.1 255.255.255.252
No ip mroute-cache
!
Interface Serial0: 1
Ip address TTT.119.96.5 255.255.255.252
No ip mroute-cache
!
Interface Serial0: 2
Ip address TTT.119.96.9 255.255.255.252
No ip mroute-cache
!
No ip classless
Ip route YYY.210.40.0 255.255.255.0 Serial0: 0
Ip route YYY.210.41.0 255.255.255.0 Serial0: 1
Ip route YYY.210.42.0 route 255.255.0 Serial0: 2
!
Line con 0
Line aux 0
Line vty 0 4
Password shanxi
Login
!
End