Cisco ASR 900 Series User Manual

core which matches the ACL is redirected to the egress line card, where it is dropped due to the absence
of appropriate entries in the disposition table.
•
Pseudowires redundancy is not supported.
• Fragmentation of IP packets is not supported. The Don’t Fragment (DF) bit is set when the IP header is
inserted.
•
Path MTU is not supported.
•
Differential synchronization mode is not supported.
•
The optional Real-Time Protocol (RTP) header is not supported on CEMoUDP.
•
The Time To Live (TTL) value in the IP header is configurable under the pseudowire class. The default
value is 255.
•
Adaptive Clock Recovery is not supported.
Restrictions for Circuit Emulation Service over UDP on the Cisco ASR 900
Series Routers
•
The following are the only application protocols with same loopback as used by CEM over UDP that
are supported on router:
◦
SSH
◦
Syslog
◦
Radius
◦
SNMP
◦
NTP
The interfaces on the chassis may not work when cemoudp reserve bay configuration is unconfigured.
The CEM data sent by the peer may hog the CPU. We recommend to shutdown the core links connecting
the PE routers and add the configurations on the loopback interface.
Note
Information About Circuit Emulation Service over UDP
CES Overview
Circuit Emulation Service—Internetworking Function (CES-IWF) is a service based on ATM forum standards
that allows communications to occur between Constant Bit Rate (CBR) or AAL1 CES and ATM User Network
Interfaces (UNI); that is, between non-ATM telephony devices (such as classic private branch exchange (PBX)
or Time Division Multiplexing (TDM) and ATM devices.
MPLS Basic Configuration Guide, Cisco IOS XE Everest 16.5.1 (Cisco ASR 900 Series)
126
Circuit Emulation Service over UDP
Restrictions for Circuit Emulation Service over UDP on the Cisco ASR 900 Series Routers

Cisco ASR 900 Series Specifications

General

Brand	Cisco
Model	ASR 900 Series
Category	Network Router
Language	English