Cisco ASR 900 Series Release Notes page 198

Limitations and Restrictions
In Release 3.9, the router keeps hardware and software-handled BFD echo mode sessions active
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during ISSU. Releases prior to 3.9 do not maintain hardware-offloaded BFD echo mode sessions
during ISSU.
If you downgrade from 3.9 to a prior release with a BFD echo mode configuration, you must increase
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the timer to 200ms or greater.
Bridge Domain Interface Limitation
• The mtu command is not supported on BDI interfaces; however the ip mtu command is supported.
Clocking and Timing Limitations
Only a single clocking input source can be configured within each group of eight ports (0-7 and
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8-15) on the T1/E1 interface module using the network-clock input-source command.
• Synchronous Ethernet clock sources are not supported with PTP. Conversely, PTP clock sources are
not supported with synchronous Ethernet. However, you can use hybrid clocking to allow the router
to obtain frequency using Synchronous Ethernet and phase using PTP.
PTP over Ethernet is not supported in multicast mode; only unicast mode is supported
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G.8265.1 telecom profile is not supported for PTP over Ethernet.
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The Cisco ASR 903 Router does not support a mix of IPv4 and Ethernet clock-ports when acting as
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a transparent clock or boundary clock.
Out-of-band clocking and the recovered-clock command are not supported.
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The Synchronization Status Message (SSM) is not currently on OC-3 and OC-12 interfaces.
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End-to-end Transparent Clock is not supported for PTP over Ethernet.
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Dying Gasp Limitations
The Cisco ASR 903 Router supports dying gasp under the following scenarios:
Ethernet OAM is disabled
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Interface is shut down
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Interface enters error-disabled state
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Router reload
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Dying Gasp is not supported in the event of a power failure.
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EFP Limitations
Trunk EFPs are not supported on port channel interfaces.
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Up to 1000 VLANs are supported for trunk EFP over etherchannel traffic.
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Ethernet IM Limitations
• The Cisco ASR 903 Router does not support the Facilities Data Link (FDL) on Ethernet interfaces.
The Cisco ASR 903 Router does not support the mac-address command on Gigabit Ethernet
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interface modules.
• 10 Gigabit Ethernet interface modules are not supported in slots 4 and 5.
When you install a Gigabit Ethernet IM in the topmost interface module slot (slot 5), the last
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interface (interface GigabitEthernet0/5/0) is not operational; the port is reserved for internal
communication.
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
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OL-26630-12