Restrictions
•
The ATM SPAs in the Cisco ASR 1000 Series Routers do not support APS reflector and reflector channel
modes. (These modes require a facing path terminating element [PTE], which is typically a Cisco ATM
switch.)
•
The ATM SPAs in the Cisco ASR 1000 Series Aggregation Services Routers do not support a data path
on the main interface. Data is only supported in subinterface configuration.
•
Link Fragmentation and Interleaving (LFI) processing is not supported.
•
Integrated Local Management Interface (ILMI) is not supported.
•
Multipoint subinterfaces are not supported in releases prior to Cisco IOS XE Release 2.5.
•
Routed Bridge Encapsulation Subinterface Grouping is not supported.
•
For best performance, we recommend the following maximums:
Releases Prior to Cisco IOS XE Release 2.5
In releases before Cisco IOS XE Release 2.5, an absolute maximum of 1,000 (1K) configured VCs per ATM
SPA (1,000 [1K] per interface) with the following recommended limitations:
•
A recommended maximum number of 1,000 PVCs on all point-to-point subinterfaces for all ATM
SPAs in a SIP.
◦
◦
A recommended maximum number of 1,024 PVCs using service policies for all ATM SPAs in a
SIP.
Cisco IOS XE Release 2.5 and Later
Beginning in Cisco IOS XE Release 2.5, the following recommended limits are supported:
•
4,000 VCs per interface
◦
◦
12,000 VCs per SPA
◦
32,000 VCs per system (Cisco ASR 1000 Series Router)
These limits are flexible and depend on all factors that affect performance in the router, such as processor
card, type of traffic, and so on.
Note
•
A maximum number of 4,000 PVCs configured with Modular QoS CLI (MQC) policy maps.
•
In the default configuration of the transmit path trace buffer, the ATM SPA does not support automatic
updates of remote host name and IP address (as displayed by the
show controllers atm
command). This
information is updated only when the interface is shut down and reactivated (using the
shutdown
and
no shutdown
commands). Information for the received path trace buffer, however, is automatically
updated.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS
XE Everest 16.5
52
OL-14127-17
Overview of the ATM SPAs
Restrictions