From the Cisco IOS XE 16.5.1 and 16.6.1 releases, In-Service Software Upgrade (ISSU) is not supported on the router to the latest releases. For more information on the compatible release versions, see ISSU Support Matrix.

The port restriction on 1-port OC-192 or 8-port low rate CEM interface module is on port pair groups. If you have OC48 configured on a port, the possible port pair groups are 0-1, 2-3, 4-5, 6-7. If one of the port within this port group is configured with OC48 rate, the other port cannot be used.

RS422 pinout works only on ports from 0 to 7.

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 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:

Packet Format

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.

T1 SAToP, T3 SAToP, and CT3 are supported on an UPSR ring only with local connect mode. Cross-connect configuration of T1, T3, and CT3 circuits to UPSR are not supported.

PTP is not supported when 8-port 10 Gigabit Ethernet interface module is in oversubscribed mode.

ISSU is not supported between a Cisco IOS XE 3S release and the Cisco IOS XE Amsterdam 17.1.x release.

This following restrictions are applicable only to Cisco 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 bi-directionally at the line rate.

Port channel 61-64 is not supported in the 16.11.1a release. The range of configurable port channel interfaces has been limited to 60.

In the Cisco IOS XE 16.12.1 and 17.1.1 releases, IPSec is not supported on the Cisco RSP3 module.

In the Cisco IOS XE 17.1.1 release, the EVPN EVI type is VLAN-based by default, and while configuring for the EVPN EVI type, it is recommended to configure the EVPN EVI type as VLAN-based, VLAN bundle and VLAN aware model.