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| Title | Size | Download |
|---|---|---|
| 02-WAN Interface Configuration | 118.78 KB |
Contents
Configuring a CE1 interface (in E1 mode)
Configuring a CE1 interface (in CE1 mode)
Configuring other CE1 interface parameters
Displaying and maintaining CE1 interfaces
Configuring other CT1 interface parameters
Displaying and maintaining CT1 interfaces
In terms of line type, wide area networks (WANs) fall into these types: X.25, Frame Relay (FR), ATM, and ISDN.
The router supports CE1 interfaces (see “CE1 interface”) and CT1 interfaces (see “CT1 interface”).
CE1 interface
Overview
In 1960s, the time division multiplexing (TDM) technology gained increasingly wide application in data communications systems along with the introduction of pulse code modulation (PCM) technology.
So far, there are two TDM systems in the data communications system.
· E1 system—Recommended by ITU-T- and widely used in Europe and P.R. China.
· T1 system—Recommended by ANSI- and widely used in North American and Japan. (Japan actually uses the J1 system. It is regarded as a T1 system due to the high level of similarity between them.)
A CE1 interface can work in either E1 mode (also called non-channelized mode) and CE1 mode (also called channelized mode).
· A CE1 interface in E1 mode equals an interface of 2.048 Mbps data bandwidth, on which, no timeslots are divided. Its logical features are the same as those of a synchronous serial interface. It supports the link layer protocols PPP and HDLC and the network protocol IP.
· A CE1 interface in CE1 mode is physically divided into 32 timeslots numbered 0 to 31. Among them, timeslot 0 is used to transmit synchronizing information. All the timeslots except timeslot 0 can be randomly divided into multiple channel sets and each set can be used as an interface upon timeslot bundling. The logical features of the interface thus created are the same as those of a synchronous serial interface. This interface supports link layer protocols PPP, HDLC, and FR, and network protocol IP.
Configuring a CE1 interface (in E1 mode)
To configure a CE1 interface in E1 mode:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Enter CE1 interface view. |
controller e1 number |
N/A |
|
3. Set the interface to operate in E1 mode. |
using e1 |
The default operating mode is CE1 mode. |
|
4. Set other interface parameters. |
Optional. |
After you set the CE1 interface to operate in E1 mode, the system automatically creates a serial interface numbered serial interface-number:0. This interface is logically equivalent to a synchronous serial interface where you can configure other settings such as:
· Parameters of data link protocols such as PPP and HDLC
· IP address
Configuring a CE1 interface (in CE1 mode)
To configure a CE1 interface in CE1 mode:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Enter CE1 interface view. |
controller e1 number |
N/A |
|
3. Set the interface to operate in CE1 mode. |
using ce1 |
Optional. The default operating mode is CE1 mode. |
|
4. Bundle timeslots on the interface into a channel set. |
channel-set set-number timeslot-list list |
N/A |
|
5. Set other interface parameters. |
Optional. |
A CE1 interface in CE1 mode can be used as a CE1 interface where a serial interface is created upon creation of a channel set. You may bundle the timeslots on a CE1 interface into up to 31 channel sets.
For each channel set, the system automatically creates a serial interface numbered serial interface-number:set-number. This interface is logically equivalent to a synchronous serial interface where you can configure other settings such as:
· Parameters of data link protocol such as PPP and HDLC
· IP addressing
Configuring other CE1 interface parameters
To configure other CE1 interface parameters:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Enter CE1 interface view. |
controller e1 number |
N/A |
|
3. Configure the interface description. |
description text |
Optional. The default description is Interface name Interface. |
|
4. Set the line code format. |
code { ami | hdb3 } |
Optional. The default is high density bipolar 3 (HDB3). |
|
5. Set the cable type. |
cable { long | short } |
Optional. The default cable type is long. |
|
6. Set the clock mode. |
clock { master | slave } |
Optional. The default is slave, that is, line clock. |
|
7. Enable automatic clock mode change. |
clock-change auto |
Optional. Disabled by default. |
|
8. Set the framing format. |
frame-format { crc4 | no-crc4 } |
Optional. The default is no-CRC4. |
|
9. Enable loopback and set the loopback mode. |
loopback { local | payload | remote } |
Optional. Loopback is disabled by default. |
|
10. Restore the default settings. |
default |
Optional. |
|
11. Disable the CE1 interface. |
shutdown |
Optional. A CE1 interface is enabled by default. |
|
12. Return to system view. |
quit |
N/A |
|
13. Enter the view of the synchronous serial interface created on the CE1 interface. |
· interface serial interface-number:set-number · interface serial interface-number:0 |
Use either command. |
|
14. Set the CRC mode. |
crc { 16 | 32 | none } |
Optional. By default, 16-bit CRC is adopted. |
|
15. Set the MTU. |
mtu mtu |
Optional. 1500 by default. |
|
16. Set the keepalive transmission interval. |
timer hold seconds |
Optional. 10 seconds by default. |
|
17. Specify the link layer protocol. |
link-protocol { fr | hdlc | ppp } |
Optional. PPP by default. Support for Frame Relay depends on the daughter cards. |
|
|
NOTE: Do not configure loopback on a CE1 interface configured with MP-group bundles. Otherwise, MP interface out-of-sequence problems will occur. |
Displaying and maintaining CE1 interfaces
|
Task |
Command |
Remarks |
|
Display the operating state of a CE1 interface. |
display controller e1 [ interface-number ] [ | { begin | exclude | include } regular-expression ] |
Available in any view |
|
Display the operating state of a serial interface. |
display interface serial [ interface-number:set-number ] [ | { begin | exclude | include } regular-expression ] |
Available in any view |
|
Clear the controller counter of a CE1 interface. |
reset counters controller e1 interface-number |
Available in user view |
CT1 interface
Overview
A CT1 interface can operate only in channelized mode. All the timeslots (numbered from 1 to 24) can be randomly divided into groups. Each of these groups can form one channel set for which the system automatically creates an interface logically equivalent to a synchronous serial interface. This interface supports link layer protocols PPP, HDLC, and FR, and network protocol IP.
Configuring a CT1 interface
To configure a CT1 interface:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Enter CT1 interface view. |
controller t1 number |
N/A |
|
3. Bundle timeslots on the interface into a channel set. |
channel-set set-number timeslot-list list [ speed { 56k | 64k } ] |
Up to 24 channel sets can be bundled. The default timeslot speed is 64 kbps. |
|
4. Set other interface parameters. |
Optional. |
For each channel set, the system automatically creates a serial interface numbered serial number:set-number. This interface is logically equivalent to a synchronous serial interface where you can make other configurations about:
· Data link protocol such as PPP and HDLC
· IP address
Configuring other CT1 interface parameters
To configure other CT1 interface parameters:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Enter CT1 interface view. |
controller t1 number |
N/A |
|
3. Configure the interface description. |
description text |
Optional. The default description is Interface name Interface. |
|
4. Set the cable length and cable attenuation. |
· cable long { 0db | -7.5db | -15db | -22.5db } · cable short { 133ft | 266ft | 399ft | 533ft | 655ft } |
Optional. The long 0db keywords apply by default. |
|
5. Set the line code format. |
code { ami | b8zs } |
Optional. The default is B8ZS1. |
|
6. Set the clock mode. |
clock { master | slave } |
Optional. The default is slave, that is, line clock. |
|
7. Set the framing format. |
frame-format { esf | sf } |
Optional. The default is ESF. |
|
8. Set the behavior of the interface on the FDL in ESF framing. |
fdl { ansi | att | both | none } |
Optional. The default is none, meaning that FDL is forbidden. |
|
9. Enable loopback. |
loopback { local | remote | payload } |
Optional. Disabled by default. |
|
10. Send remote loopback control code. |
sendloopcode { fdl-ansi-llb-down | fdl-ansi-llb-up | fdl-ansi-plb-down | fdl-ansi-plb-up | fdl-att-plb-down | fdl-att-plb-up | inband-llb-down | inband-llb-up } |
Optional. No remote loopback control code is sent by default. |
|
11. Restore the default settings. |
default |
Optional. |
|
12. Shut down the CT1 interface. |
shutdown |
Optional. A CT1 interface is enabled by default. |
|
13. Return to system view. |
quit |
N/A |
|
14. Enter the view of the synchronous serial interface created on the CT1 interface. |
interface serial interface-number:set-number |
N/A |
|
15. Set the CRC mode. |
crc { 16 | 32 | none } |
Optional. By default, 16-bit CRC is adopted. |
|
16. Set the MTU of the serial interface. |
mtu mtu |
Optional. 1500 bytes by default |
|
17. Set the keepalive transmission interval. |
timer hold seconds |
Optional. 10 seconds by default |
|
18. Configure the link layer protocol of the serial interface. |
link-protocol { fr | hdlc | ppp } |
Optional. PPP by default. Support for Frame Relay depends on the daughter cards. |
|
1. B8ZS = Bipolar 8 zeros substitution; 2. ESF = Extended super frame; 3. LOS = Loss of signal; 4. AIS = Alarm indication signal; 5. LFA = Loss of frame align |
||
Displaying and maintaining CT1 interfaces
|
Task |
Command |
Remarks |
|
Display the operating state of CT1 interfaces. |
display controller t1 [ interface-number ] [ | { begin | exclude | include } regular-expression ] |
Available in any view |
|
Display the operating state of a serial interface. |
display interface serial interface-number:set-number [ | { begin | exclude | include } regular-expression ] |
Available in any view |
|
Clear the controller counter of a CT1 interface. |
reset counters controller t1 interface-number |
Available in user view |
