IPsec is not supported in Cisco IOS XE Everest 16.6.1 release.
In-Service Software Upgrade (ISSU) is not supported in the Cisco IOS XE Everest 16.6.1 release.
The ip cef accounting command is not supported on the router.
Crash may be observed on the router when:
EoMPLS, CEM, ATM and IMA Pseudowire Redundancy (PW-redundancy) configurations exist while switchover and fail-back of the
pseudowires are being triggered, and the show platform hardware pp active pw eompls command is executed.
Configuration sync does not happen on the Standby RSP when the active RSP has Cisco Software Licensing configured, and the standby RSP has Smart Licensing
configured on the router. If the active RSP has Smart Licensing configured, the state of the standby RSP is undetermined.
The state could be pending or authorized as the sync between the RSP modules is not performed.
Evaluation mode feature licenses may not be available to use after disabling, and enabling the smart licensing on the ASR
903 RSP2 module. A reload of the router is required.
Ingress counters are not incremented for packets of the below format on the RSP3 module for the 10 Gigabit Ethernet interfaces,
100 Gigabit Ethernet interfaces, and 40 Gigabit Ethernet interfaces:
MAC header---->Vlan header---->Length/Type
When these packets are received on the RSP3 module, the packets are not dropped, but the counters are not incremented.
ISSU is not supported between a Cisco IOS XE 3S Release and the Cisco IOS XE Everest 16.6.1.
This is applicable only to Cisco ASR 903 RSP2 module.
Traffic is dropped when packets of size 64 to 100 bytes are sent on 1G and 10G ports.
For 64-byte packets, traffic drop is seen at 70% and beyond of the line rate.
For 90-byte packets, traffic drop is seen at 90% and beyond of the line rate.
For 95-byte packets, traffic drop is seen at 95% and beyond of the line rate.
Traffic is dropped when:
Traffic is sent on a VRF interface.
Traffic is sent across layer 2 and layer 3.
However, traffic is not dropped when the packet size is greater than 100 bytes, even if the packets are sent bidirectionally
at the line rate.
Effective with Cisco IOS XE Everest 16.6.1, the Port-channel (PoCH) scale is
reduced to 24 from 48 for Cisco ASR 900 RSP3 module.