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Cisco Bug: CSCvr94728 - Non-existing service policy can be configured on virtual interface if not bound yet to any physical

Last Modified

Oct 09, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.6.2.BASE

Description (partial)

Symptom:
Inexistent QoS policy-map can be applied to a virtual interface if it's not associated yet to any physical interface.

Example of a BVI that's not bound yet to any physical interface:

RP/0/RP0/CPU0:ncs5501#sh run formal | i BVI10
Building configuration...
interface BVI10
interface BVI10 ipv4 address 21.21.21.2 255.255.255.0
RP/0/RP0/CPU0:ncs5501#sh run policy-map Non-Existing
% No such configuration item(s)

RP/0/RP0/CPU0:ncs5501#conf
RP/0/RP0/CPU0:ncs5501(config)#
RP/0/RP0/CPU0:ncs5501(config)#interface BVI10
RP/0/RP0/CPU0:ncs5501(config-if)#service-policy output Non-Existing
RP/0/RP0/CPU0:ncs5501(config-if)#commit
RP/0/RP0/CPU0:ncs5501(config-if)#

As a consequence, interface manager may continuously report errors while trying to configure additional virtual interfaces:

RP/0/RP0/CPU0:Oct 17 06:24:50.279 UTC: ifmgr[244]: %PKT_INFRA-IFMGR-6-IMPLICIT_DOWNLOAD_FAIL : After 833 minutes of retries, implicit download of 18 interfaces is still failing (first intf Null0, error: Success)

Show commands related to interfaces that are still pending download by ifmgr are resulting in a sysdb error:

RP/0/RP0/CPU0:Oct 14 14:46:47.772 UTC: sysdb_svr_local[180]: %SYSDB-SYSDB-6-TIMEOUT_EDM : EDM request for 'oper/show_int/vlan/if/Bundle-Ether1018' from 'intf_mgbl' (jid 1243, node 0/RP0/CPU0). No response from 'vlan_ma' (jid 296, node 0/RP0/CPU0) within the timeout period (100 seconds)

Further symptoms may include:

LC/0/0/CPU0:Oct 14 02:06:44.897 UTC: fia_driver[216]: %PLATFORM-OFA-4-WARN_ERR : NPU command request timedout, collect /var/log/npu_timeout.log from LC

LC/0/0/CPU0:Oct 14 19:58:53.252 UTC: pifibm_server_lc[212]: %OS-BCDL-7-MSG_STALL : group pa_ff: No data message received for the last 360 seconds on the subgroup: 1

RP/0/RP0/CPU0:Oct 14 08:24:21.107 UTC: arp[348]: ARP-ERROR: No media found for interface Bundle-Ether1014

Conditions:
All following conditions must be met:
1) Virtual interface is not bound to any physical interface. Possible use cases:
1.1) BVI: BVI interface is not bound to any bridge domain with configured attachment circuits. 
1.2) Bundle-Ether: Bundle-Ether interface is configured, but without any members.
1.3) PWHE: PW-Ether interface is configured, but it's not bound to any generic-interface-list.
2) Inexistent QoS service policy is applied to the virtual interface.

All DNX platforms are affected: NCS5500, NCS5000, NCS540, NCS560.
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