Cisco ASR 5000 Series Administration Manual page 49

Enhanced Charging Service Overview
supported features. By limiting the supported features, Fastpath eliminates the overhead of packets being subjected to
the large number of feature-based conditional checks in ECS.
Fastpath does not replace the existing data path, and works in parallel with the existing ECS data path. The Fastpath
feature is part of the Transactional Rule Matching (TRM) feature and requires TRM to be enabled.
Important:
and will be governed by only the
independently can no longer be used to turn on or turn off this functionality.
Feature Support
The following table provides information on the supported and unsupported features of Fastpath. Features that are listed
under the Optimized column in the table below indicate that the features are directly supported by Fastpath. Features
that are listed under the Eligible column in the table below indicate that a flow requiring the feature does not prevent
itfrom taking advantage of Fastpath. Features that are listed under the unsupported column in the table below indicate
that all packets in the flow that belong to the feature is not supported for Fastpath and will take the existing ECS data
path.
Important:
Table 4. Flow-level Support
Feature
Url Redirect
Charging Bucket Maintenance
ITC/BW control
Next Hop
TCP State based rules
Post-processing Rules
Flow limit - Discard/Redirect/Terminate-Flow/Terminate-Session
DSCP / IP TOS
ICSR
Session Recovery
Content Filtering(CF) Static
CF Dynamic
Socket Migration
Blacklisting
ICAP
NAT
From 16.0 release, Transactional Rule Matching and Fastpath functionalities have been merged,
transactional-rule-matching
The TRM feature is supported in SSI platform; earlier it was restricted only to ASR5500.
keyword alone. The keyword
Fastpath Optimized Fastpath Eligible
— Yes
— Yes
— Yes
— Yes
— Yes
— Yes
— Yes
— Yes
— Yes
— Yes
— —
— —
— —
— Yes
— —
Yes —
Cisco ASR 5x00 Enhanced Charging Services Administration Guide ▄
Enhanced Features and Functionality ▀
fastpath
Unsupported
—
—
—
—
—
—
—
—
—
—
Yes
Yes
Yes
—
Yes
—
49