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[M/T] SONET interface goes down due to a change in default behavior with the corresponding 'max-queues-per-interface' knob usage

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Article ID: KB33633 KB Last Updated: 27 Dec 2018Version: 1.0
Summary:

This article provides information about the expected behavior with the number of interfaces that can be configured on T640 or M320 routers with a specific SONET PIC and FPC combination and the 'max-queues-per-interface' knob.

Symptoms:

For a Juniper router, having a specific combination of the following SONET PICs and FPCs (Type 1, Type 2 and Type 3 FPCs non-ES), the default queue number per interface supported is up to 8 different queues with the no 'max-queues-per-interface' knob configuration.

SONET PICs

4x OC-3 SONET or 4x STM-1 SDH
4x OC-3 SONET or 4x STM-1 SDH
4x OC-3 1x OC-12 SFP or 4x STM-1 1x STM-4 SFP
4x T3
4x E3

FPC (Type 1, Type 2, and Type 3 FPCs non-ES)

Type 1: T640-FPC1-E2
Type 2: M320-FPC2-E2
Type 3: T640-FPC3-E2
 

When using a combination of the above PICs and FPCs and defaults, with no configuration for 'max-queues-per-interface' knob, only ports 0 and 2 are enabled:

Example:

root@jtac-t640-lab> show chassis hardware detail
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                70268             T640
< >
FPC 3            REV 04   710-013553   JY7686            E2-FPC Type 1 >>>>>>>>
  CPU            REV 02   710-013563   JY5396            FPC CPU-Enhanced
  PIC 0          REV 14   750-012266   YE8094            4x 1GE(LAN), IQ2
    Xcvr 0       REV 01   740-038291   PUP1XQE           SFP-T
    Xcvr 1       REV 01   740-038291   PUP1YDG           SFP-T
    Xcvr 2       REV 01   740-038291   C221854           SFP-T
    Xcvr 3       REV 01   740-031851   AM152629EXS       SFP-SX
  PIC 1          REV 13   750-012266   WS9451            4x 1GE(LAN), IQ2
    Xcvr 0       REV 01   740-031851   AM152428RTH       SFP-SX
    Xcvr 1       REV 01   740-031851   AM152629FYS       SFP-SX
    Xcvr 2       REV 02   740-011613   PJ32S3Z           SFP-SX
    Xcvr 3       REV 01   740-031851   AM16092H48H       SFP-SX
  PIC 2          REV 10   750-002911   NB6288            4x F/E, 100 BASE-TX
  PIC 3          REV 05   750-014627   YL8867            4x OC-3 1x OC-12 SFP  >>>>>>>>>
  MMB 1          REV 05   710-008923   JW6136            MMB 3M 288-bit
  < >
root@jtac-t640-lab> show interfaces terse | match so-
so-3/3/0                up    up
so-3/3/0.0              up    down inet     146.188.15.177/30
so-3/3/2                up    up
so-3/3/2.0              up    down inet     146.188.2.217/30
Solution:

This is the expected behavior for the Junos OS versions (and later) listed in PR1129778, which is that the default queue number per interface supported is up to 8 different queues with the no 'max-queues-per-interface' knob configuration.

To get the ports 0-4 online with 4 queues per port, add the 'chassis fpc <> pic <> max-queues-per-interface 4' configuration:

root@jtac-t640-lab> edit
Entering configuration mode
[edit]
root@jtac-t640-lab# show | compare
[edit chassis fpc 3]
+    pic 3 {
+        max-queues-per-interface 4;
+    }

[edit]
root@jtac-t640-lab# commit
commit complete

Then with a combination of SONET PICs and FPCs, the ports of the PIC are enabled:

root@jtac-t640-lab> show interfaces terse | match so-3
so-3/3/0                up    up
so-3/3/0.0              up    up   inet     146.188.15.177/30
so-3/3/1                up    up
so-3/3/1.0              up    up   inet     146.188.15.185/30
so-3/3/2                up    up
so-3/3/2.0              up    down inet     146.188.2.217/30
so-3/3/3                up    up
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