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Example: Channelized DS3 IQ Interface Configuration

Figure 1: Channelized DS3 IQ Interface Example

Image g003028.gif

 

This example shows how to configure a channelized DS3 IQ interface. Figure 1 shows the breakdown of a DS3 interface into a variety of channels. The path that leads to NxDS0 channels is similar to the M13 with C-bit parity method seen previously in the complex OC12 configuration example (see Example: Complex Configuration for a Channelized OC12 IQ Interface). This method breaks the channelized DS3 IQ interface into channelized T1s before additional splits create DS0 time slots.

To create T1 channels, include the partition statement at the [edit interfaces ct3-fpc/pic/port] hierarchy level with the interface-type t1 option. To create channelized T1 channels, include the partition statement at the [edit interfaces ct3-fpc/pic/port] hierarchy level with the interface-type ct1 option.

After you have established a channelized T1 channel, you can split it into a maximum of 24 NxDS0 channels. To configure NxDS0 channels, include the partition statement at the [edit interfaces ct1-fpc/pic/port:channel] hierarchy level with the timeslots and interface-type ds options to create the desired number of NxDS0 channels or channel groups.

Although it is not part of the example shown, you can also create a clear channel T3 or a fractional T3 interface on a channelized DS3 IQ interface. To configure a clear channel T3 or fractional T3 interface, include the no-partition statement at the [edit interfaces ct3-fpc/pic /port] hierarchy level. After you commit this part of the configuration, a clear channel T3 interface is established. You can configure standard T3 options on this interface. To fractionalize the T3 interface, include the timeslots statement at the [edit interfaces t3-fpc/pic/port t3-options] hierarchy level.

Router A

[edit]interfaces {ct3-0/0/1 { # This is the controller level for the channelized DS3 IQ interface.partition 1 interface-type t1; # This creates the t1-0/0/1:1 channel.partition 2 interface-type ct1; # This creates the ct1-0/0/1:2 channel.partition 3-10 interface-type t1; # This creates channels t1-0/0/1:3 through :10.partition 11-28 interface-type ct1; # This creates channels ct1-0/0/1:11 to :28.}t1-0/0/1:1 {...}ct1-0/0/1:2 {partition 1 timeslots 1-10 interface-type ds; # These statements createpartition 2 timeslots 11-20 interface-type ds; # three channel groups.partition 3 timeslots 21-24 interface-type ds;}ds-0/0/1:2:1 { # This channel group contains 10 NxDS0s.unit 0 {family inet {address 10.25.1.2/24;}}}ds-0/0/1:2:2 { # This channel group contains 10 NxDS0s.unit 0 {family inet {address 10.25.2.2/24;}}}ds-0/0/1:2:3 { # This channel group contains 4 NxDS0s.unit 0 {family inet {address 10.25.3.2/24;}}}t1-0/0/1:3 {...}t1-0/0/1:10 {...}ct1-0/0/1:11 {...}ct1-0/0/1:28 {...}}

Verifying Your Work

To verify correct operation of a channelized DS3 IQ interface, use the following commands:

  • show interfaces
  • show interfaces controller
  • show interfaces interval (for T3, channelized T3, T1, and channelized T1 channels)

To view the interface names of the physical channelized DS3 IQ interface and the channels configured on this interface, use the show interfaces controller command:


user@RouterA> show interfaces controller ct3-0/0/1
Controller                                                           Admin Link
ct3-0/0/1                                                            up    up
# This is the physical channelized DS3 (channelized T3) IQ interface.
    t1-0/0/1:1                                                       up    up
# Channel 1 is a channelized T1 interface.
    ct1-0/0/1:2                                                      up    up
        ds-0/0/1:2:1                                                 up    up
        ds-0/0/1:2:2                                                 up    up
        ds-0/0/1:2:3                                                 up    up
    t1-0/0/1:3                                                       up    down
    t1-0/0/1:4                                                       up    up
    t1-0/0/1:5                                                       up    up
    t1-0/0/1:6                                                       up    up
    t1-0/0/1:7                                                       up    up
    t1-0/0/1:8                                                       up    up
    t1-0/0/1:9                                                       up    up
    t1-0/0/1:10                                                      up    up
# Channels 3 through 10 are T1 interfaces.
    ct1-0/0/1:11                                                     up    up
    ct1-0/0/1:12                                                     up    up
    ct1-0/0/1:13                                                     up    up
    ct1-0/0/1:14                                                     up    up
    ct1-0/0/1:15                                                     up    up
    ct1-0/0/1:16                                                     up    up
    ct1-0/0/1:17                                                     up    up
    ct1-0/0/1:18                                                     up    up
    ct1-0/0/1:19                                                     up    up
    ct1-0/0/1:20                                                     up    up
    ct1-0/0/1:21                                                     up    up
    ct1-0/0/1:22                                                     up    up
    ct1-0/0/1:23                                                     up    up
    ct1-0/0/1:24                                                     up    up
    ct1-0/0/1:25                                                     up    up
    ct1-0/0/1:26                                                     up    up
    ct1-0/0/1:27                                                     up    up
    ct1-0/0/1:28                                                     up    up
# Channels 11 through 28 are channelized T1 interfaces.

To view information about the physical channelized interface, include the ct3-fpc/pic/port option with the show interfaces command:


user@RouterA> show interfaces extensive ct3-0/0/1
Physical interface: ct3-0/0/1, Enabled, Physical link is Up
  Interface index: 30, SNMP ifIndex: 317, Generation: 29
  Link-level type: Controller, MTU: 4474, Clocking: Internal, Speed: T3,
  Loopback: None, FCS: 16, Mode: C/Bit parity, Parent: None
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : None
  Hold-times     : Up 0 ms, Down 0 ms
  Last flapped   : 2002-10-04 10:24:18 PDT (01:40:40 ago)
  Statistics last cleared: 2002-10-04 11:47:27 PDT (00:17:31 ago)
  Traffic statistics:
   Input  bytes  :                    0                    0 bps
   Output bytes  :                    0                    0 bps
   Input  packets:                    0                    0 pps
   Output packets:                    0                    0 pps
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Bucket drops: 0,
    Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0,
    L2 mismatch timeouts: 0, HS link CRC errors: 0, SRAM errors: 0
  Output errors:
    Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
  Active alarms  : None
  Active defects : None
  DS3 media:            Seconds        Count  State
    PLL Lock                  0            0  OK
    Reframing                 0            0  OK
    AIS                       0            0  OK
    LOF                       0            0  OK
    LOS                       0            0  OK
    IDLE                      0            0  OK
    YELLOW                    0            0  OK
    BPV                       0            0
    EXZ                       0            0
    LCV                       0            0
    PCV                       0            0
    CCV                       0            0
    LES                       0
    PES                       0
    PSES                      0
    CES                       0
    CSES                      0
    SEFS                      0
  HDLC configuration:
    Policing bucket: Disabled
    Shaping bucket : Disabled
    Giant threshold: 0, Runt threshold: 0
  DSU configuration:
    Compatibility mode: None, Scrambling: Disabled, Subrate: Disabled
    FEAC loopback: Inactive, Response: Disabled, Count: 0
  DS-3 BERT configuration:
    BERT time period: 10 seconds, Elapsed: 0 seconds
    Algorithm: 2^3 - 1, Pseudorandom (1), Induced error rate: 10e-0
  Packet Forwarding Engine configuration:
    Destination slot: 0 (0x00)
    CoS transmit queue             Bandwidth           Buffer Priority   Limit
                              %          bps   %        bytes
    0 best-effort            95     42499200  95            0      low    none
    3 network-control         5      2236800   5            0      low    none

To view information about a channelized T1 channel, include the ct1-fpc/pic /port:channel option with the show interfaces command:


user@RouterA> show interfaces extensive ct1-0/0/1:2
Physical interface: ct1-0/0/1:2, Enabled, Physical link is Up
  Interface index: 175, SNMP ifIndex: 1505, Generation: 174
  Link-level type: Controller, MTU: 1504, Clocking: Internal, Speed: T1,
  Loopback: None, FCS: 16, Framing: ESF, Parent: ct3-0/0/1 (Index 32)
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : None
  Hold-times     : Up 0 ms, Down 0 ms
  Last flapped   : 2002-10-04 12:08:23 PDT (00:05:57 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                    0                    0 bps
   Output bytes  :                    0                    0 bps
   Input  packets:                    0                    0 pps
   Output packets:                    0                    0 pps
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Policed discards: 0,
    L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0,
    HS link CRC errors: 0, SRAM errors: 0
  Output errors:
    Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
  DS1   alarms   : None
  DS1   defects  : AIS, LOF
  T1  media:            Seconds        Count  State
    SEF                       0            0  OK
    BEE                       1            1  OK
    AIS                     355            1  Defect Active
    LOF                     355            1  Defect Active
    LOS                       0            0  OK
    YELLOW                    0            0  OK
    BPV                       0            0
    EXZ                       0            0
    LCV                       0            0
    PCV                       0            0
    CS                        0            0
    LES                     355
    ES                      355
    SES                     355
    SEFS                    355
    BES                       0
    UAS                       0
  HDLC configuration:
    Policing bucket: Disabled
    Shaping bucket : Disabled
    Giant threshold: 1514, Runt threshold: 0
    Timeslots      : All active
    Line encoding: B8ZS, Byte encoding: Nx64K
    Buildout       : 0 to 132 feet
    Data inversion: Disabled
  DS1 BERT configuration:
    BERT time period: 10 seconds, Elapsed: 0 seconds
    Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
  Packet Forwarding Engine configuration:
    Destination slot: 0 (0x00)
    CoS transmit queue             Bandwidth           Buffer Priority   Limit
                              %          bps   %        bytes
    0 best-effort            95      1459200  95            0      low    none
    3 network-control         5        76800   5            0      low    none

To view information about an NxDS0 interface, include the ds-fpc/pic/port:channel option with the show interfaces command. In this case, the speed is 640 Kbps because this channel contains 10 DS0s (64 x 10 = 640).


user@RouterA> show interfaces extensive ds-0/0/1:2:1
Physical interface: ds-0/0/1:2:1, Enabled, Physical link is Up
  Interface index: 176, SNMP ifIndex: 1563, Generation: 175
  Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: 640kbps,
  Loopback: None, FCS: 16, Parent: ct1-0/0/1:2 (Index 175)
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Hold-times     : Up 0 ms, Down 0 ms
  Last flapped   : 2002-10-04 12:09:06 PDT (00:05:54 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                    0                    0 bps
   Output bytes  :                    0                    0 bps
   Input  packets:                    0                    0 pps
   Output packets:                    0                    0 pps
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Policed discards: 0,
    L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0,
    HS link CRC errors: 0
  Output errors:
    Carrier transitions: 1, Errors: 0, Drops: 0, Aged packets: 0
  Queue counters:       Queued packets  Transmitted packets      Dropped packets
    0 best-effort                    0                    0                    0
    1 expedited-fo                   0                    0                    0
    2 assured-forw                   0                    0                    0
    3 network-cont                   0                    0                    0
  Interface transmit queues:
              B/W  WRR       Packets        Bytes        Drops       Errors
    Queue0      0    0             0            0            0            0
    Queue1      0    0             0            0            0            0
  HDLC configuration:
    Giant threshold: 0, Runt threshold: 0
    Timeslots      : 1-10
    Byte encoding: Nx64K, Data inversion: Disabled
  Packet Forwarding Engine configuration:
    Destination slot: 0, PLP byte: 4 (0x10)
    CoS transmit queue             Bandwidth           Buffer Priority   Limit
                              %          bps   %        bytes
    0 best-effort            95       608000  95            0      low    none
    3 network-control         5        32000   5            0      low    none

Published: 2010-04-15

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