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Cisco Bug: CSCvu84348 - Early-Fast-Discard classification not persistent across reload on 4th and 5th generation ASR9k cards

Last Modified

Sep 17, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.1.3.CE

Description (partial)

Symptom:
Early-Fast-Discard (EFD) classification configuration is not persistent across reload.

Configure a non-default value of early-fast-discard classification (e.g. ip-prec 4) for a lightspeed card. Verify configuration is applied and enabled.

##show run hw-module location 0/0/CPU0 early-fast-discard
hw-module location 0/0/CPU0 early-fast-discard
 ip-prec 4
!
#show hw-module early-fast-discard location 0/0/CPU0
                Node: 0/0/CPU0:
<snip>
IP Packet COS   Priority
     0            Low
     1            Low
     2            Low
     3            Low
     4            High
     5            High
     6            High
     7            High

Reload the line card.

#admin hw-module location 0/0 reload

Once line card is up, configuration is still present, but not not applied in HW. Default precedence values are applied instead.

#show run hw-module location 0/0/CPU0 early-fast-discard
hw-module location 0/0/CPU0 early-fast-discard
 ip-prec 4
!

#show hw-module early-fast-discard location 0/0/CPU0
                Node: 0/0/CPU0:
<snip>
IP Packet COS   Priority
     0            Low
     1            Low
     2            Low
     3            Low
     4            Low
     5            Low
     6            High
     7            High

Conditions:
Observed on 4th and 5th generation Ethernet line cards (aka Lightspeed) of ASR 9000 series routers. Not observed on 3rd generation Ethernet line cards (aka Tomahawk).

Trigger is a line card or router reload.
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