6-3
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-10
Chapter 6 Broadband Scalability and Performance
IP Sessions Scaling
IP Sessions Scaling
The ASR 1000 Series Routers can be deployed as an IP session aggregator. The maximum number of IP
sessions that can be supported depends on the hardware combination.
Table 6-2
lists the hardware
combination and the maximum number of IP sessions that are supported.
The session limits apply to all variety of IP session initiators: DHCP, unclassified Mac address,
unclassified IP, and RADIUS proxy.
Note
RP1 with 2GB DRAM is not recommended for IP sessions deployment.
Layer 4 Redirect Scaling
The ASR1000 supports the ability to redirect IP traffic within an ISG traffic class. Layer 4 redirect
scaling is performed by the Quantum Flow Processor (QFP). The scaling limits are dependent on the
ESP.
Table 6-3
lists the ESP and the default per-session limit.
Configuring the Cisco ASR 1000 Series Router for High
Scalability
The Cisco ASR 1000 Series Routers provide powerful performance and scalability for embedded
services.
To achieve maximum scaling on the 1001, 1002, and 1004 chassis, IOS software redundancy must be
disabled. For more information about restrictions and limitations, see the
“Restrictions for PPP Sessions
and L2TP Tunnel Scaling” section on page 6-2
.
Table 6-2
Maximum Number of IP Sessions Supported on ASR 1000 Hardware
Chassis
RP
ESP
IP Session
ISG Traffic Class
1001
Integrated
ESP-2.5G or ESP-5G
8000
24000
1002
Integrated RP1
ESP-5G
12000
36000
1004, 1006
RP1
ESP-10G or ESP-20G
24000
72000
1004, 1006, 1013
RP2
ESP-20G or ESP-40G
32000
96000
Table 6-3
Maximum Number of Per-Session Limit Per ESP
ESP
L4 Redirect Translations
Default Per-Session Limit
ESP-2.5G
256K
128
ESP-5G
256K
128
ESP-10G
512K
128
ESP-20G
1 Million
128
ESP-40G
1 Million
128
