Figure 7: Channelized T1 IQ Interface Example
The following example shows two ways to configure a channelized T1 IQ interface. Figure 7 shows a fractional T1 method and the NxDS0 method seen previously in the complex OC12 configuration example (see Example: Complex Configuration for a Channelized OC12 IQ Interface). The NxDS0 method breaks the channelized T1 IQ interface into discrete DS0 blocks, whereas the fractional method creates a clear channel T1 that is segmented by time slots.
To configure NxDS0 channels, include the partition statement at the [edit interfaces ct1-fpc/pic/port] hierarchy level. Include the timeslots and interface-type ds options to create the desired number of NxDS0 interfaces in time slots 1 through 24.
To configure a clear channel T1 on a channelized T1 IQ interface, include the no-partition statement with the interface-type t1 option at the [edit interfaces ct1-fpc/pic/port] hierarchy level. After you commit this configuration, you can create a fractional T1 on the clear channel T1 interface. To do so, include the timeslots statement at the [edit interfaces t1-fpc/pic/port t1-options] hierarchy level and specify the number of DS0 blocks to be allowed in the fractional T1 interface. The minimum number of 64-Kbps DS0 blocks you can configure is 1 and the maximum is 24.
Usually, you configure loopback statements at the controller level for all IQ-based channelized interfaces. One exception for channelized T1 IQ interfaces is that you must configure a payload loopback on a T1 IQ interface instead of the controller-level channelized T1 IQ interface. To configure, include the payload option at the [edit interfaces t1-fpc/pic/port t1-options loopback] hierarchy level.
Router A—NxDS0 Method
- [edit]
- interfaces {
-
- ct1-2/3/7 {
- partition 1 timeslots 10 interface-type ds; # Creates NxDS0 channel ds-2/3/7:1.
- partition 2 timeslots 1-9 interface-type ds; # Creates
a channel group with
- } #
9 NxDS0s.
-
- ds-2/3/7:1 {
-
- unit 0 {
-
- family inet {
- address 10.25.1.2/24;
- }
- }
- }
-
- ds-2/3/7:2 {
-
- unit 0 {
-
- family inet {
- address 10.25.2.2/24;
- }
- }
- }
- }
Router A—Fractional T1 Method
- [edit]
- interfaces {
-
- ct1-2/3/8 {
- no-partition interface-type t1; # This creates a single
T1 channel: t1-2/3/8.
- }
-
- t1-2/3/8 {
-
- t1-options {
- timeslots 1-2; # This statement enables only 2 of the 24 NxDS0 time slots
- } #
available on t1-2/3/8.
-
- unit 0 {
-
- family inet {
- address 10.255.126.2/24;
- }
- }
- }
- }
To verify correct operation of a channelized T1 IQ interface, use the following commands:
To view the interface names of the physical channelized T1 IQ interface and the resulting interfaces configured on the channelized IQ interface, use the show interfaces controller command:
user@RouterA> show interfaces controller
ct1-2/3/7
Controller Admin Link
ct1-2/3/7 up up
ds-2/3/7:1 up up
ds-2/3/7:2 up up
# ct1-2/3/7 is the physical channelized T1 IQ interface, and ds-2/3/7:1 and ds-2/3/7:2 are the resulting N xDS0 interfaces.
user@RouterA> show interfaces controller ct1-2/3/8
Controller Admin Link
ct1-2/3/8 up up
t1-2/3/8 up up
# ct1-2/3/8 is the physical channelized T1 IQ interface, and t1-2/3/8 is the resulting T1 interface.
To view information about the physical channelized interface, include the ct1-fpc/pic/port option with the show interfaces command:
user@RouterA> show interfaces ct1-2/3/7
Physical interface: ct1-2/3/7, Enabled, Physical link is Up
Interface index: 18, SNMP ifIndex: 1128, Generation: 27
Link-level type: Controller, Clocking: Internal, Speed: T1,
Loopback: None, Framing: ESF, Parent: None
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps 16384
Link flags : None
Hold-times : Up 0 ms, Down 0 ms
CoS queues : 4 supported
Last flapped : 2005-08-01 18:00:12 PDT (1d 00:31 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Statistics last cleared: Never
DS1 alarms : None
DS1 defects : None
Line encoding: B8ZS
user@RouterA> show interfaces ct1-2/3/8
Physical interface: ct1-2/3/8, Enabled, Physical link is Up
Interface index: 25, SNMP ifIndex: 1134, Generation: 28
Link-level type: Controller, Clocking: Internal, Speed: T1,
Loopback: None, Framing: ESF, Parent: None
FCS: 16, Framing: G704, Parent: None
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps 16384
Link flags : None
Hold-times : Up 0 ms, Down 0 ms
CoS queues : 4 supported
Last flapped : 2005-08-01 18:00:11 PDT (1d 00:30 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Statistics last cleared: Never
DS1 alarms : None
DS1 defects : None
Line encoding: B8ZS
To view information about an NxDS0 interface, include the ds-fpc/pic/port:channel option with the show interfaces command:
user@RouterA> show interfaces
ds-2/3/7:1 detail
Physical interface: ds-2/3/7:1, Enabled, Physical link is Up
Interface index: 73, SNMP ifIndex: 1202, Generation: 325
Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: 64kbps, Loopback: None,
FCS: 16, Parent: ct1-2/3/7 Interface index 18
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps 16384
Link flags : Keepalives
Hold-times : Up 0 ms, Down 0 ms
Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
Keepalive statistics:
Input : 11 (last seen 00:00:02 ago)
Output: 10 (last sent 00:00:06 ago)
LCP state: Opened
NCP state: inet: Opened, inet6: Opened, iso: Opened, mpls: Not-configured
CHAP state: Not-configured
CoS queues : 4 supported
Last flapped : 2005-08-03 12:30:37 PDT (00:10:26 ago)
Statistics last cleared: Never
Traffic statistics:
Input bytes : 559 56 bps
Output bytes : 656 56 bps
Input packets: 33 0 pps
Output packets: 36 0 pps
Queue counters: Queued packets Transmitted packets Dropped packets
0 best-effort 40 40 0
1 expedited-fo 0 0 0
2 assured-forw 0 0 0
3 network-cont 0 0 0
Logical interface ds-2/3/7:1.0 (Index 36) (SNMP ifIndex 1266) (Generation 153)
Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
Protocol inet, MTU: 1500, Generation: 352, Route table: 0
Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 10.25.1/24, Local: 10.25.1.2, Broadcast: 10.25.1.255,
Generation: 445
Protocol iso, MTU: 1500, Generation: 353, Route table: 0
Flags: Is-Primary
Protocol inet6, MTU: 1500, Generation: 354, Route table: 0
Flags: Is-Primary
Addresses, Flags: Is-Preferred
Destination: fe80::/64, Local: fe80::2a0:a5ff:fe3d:ac6, Broadcast: Unspecified,
Generation: 446
Addresses, Flags: Is-Preferred Is-Primary
Destination: feee::10:25:1:0/126, Local: feee::10:25:1:2,
Broadcast: Unspecified, Generation: 448
To view information about a T1 or fractional T1 interface, include the t1-fpc/pic /port option with the show interfaces command. The Speed: field shows if the interface is a full T1(T1) or a fractional T1 (increments of 64 Kbps). In this case, t1-2/3/8 is a fractional T1 using two 64-Kbps time slots for a total speed of 128 Kbps.
user@RouterA> show interfaces t1-2/3/8
detail
Physical interface: t1-2/3/8, Enabled, Physical link is Up
Interface index: 89, SNMP ifIndex: 1278, Generation: 341
Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: 128kbps,
Loopback: None, FCS: 16, Parent: ct1-2/3/8 Interface index 25
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps 16384
Link flags : Keepalives
Hold-times : Up 0 ms, Down 0 ms
Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
Keepalive statistics:
Input : 4 (last seen 00:00:05 ago)
Output: 3 (last sent 00:00:09 ago)
LCP state: Opened
NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:
Not-configured
CHAP state: Not-configured
CoS queues : 4 supported
Last flapped : 2005-08-03 12:30:37 PDT (01:17:36 ago)
Statistics last cleared: Never
Traffic statistics:
Input bytes : 189 0 bps
Output bytes : 478 0 bps
Input packets: 13 0 pps
Output packets: 28 0 pps
Queue counters: Queued packets Transmitted packets Dropped packets
0 best-effort 28 28 0
1 expedited-fo 0 0 0
2 assured-forw 0 0 0
3 network-cont 0 0 0
DS1 alarms : None
DS1 defects : None
Logical interface t1-2/3/8.0 (Index 52) (SNMP ifIndex 1279) (Generation 169)
Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
Protocol inet, MTU: 1500, Generation: 401, Route table: 0
Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 10.255.126/24, Local: 10.255.126.2,
Broadcast: 10.255.126.255, Generation: 525
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