CHAPTER
6-1
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-10
6
Broadband Scalability and Performance
The infrastructure of a service provider must be capable of supporting the services that an enterprise
customer or Internet service provider (ISP) wants to offer its subscribers. The service provider must also
be able to scale up to an expanding subscriber base. You can configure the Cisco ASR1000 Series
Routers for high broadband scalability.
This chapter provides information about the following topics:
• PPP Sessions and L2TP Tunnel Scaling, page 6-1
• IP Sessions Scaling, page 6-3
• Layer 4 Redirect Scaling, page 6-3
• Configuring the Cisco ASR 1000 Series Router for High Scalability, page 6-3
• Using the cisco-avpair="lcp:interface-config" RADIUS Attribute, page 6-6
PPP Sessions and L2TP Tunnel Scaling
The ASR 1000 Series Routers are deployed in a variety of broadband deployment models for terminating
Point-to-Point Protocol (PPP) Sessions and initiating or terminating Layer 2 Tunneling Protocol (L2TP)
tunnels. The maximum number of PPP sessions and L2TP tunnels is dependent on the hardware
combination.
Table 6-1 lists the hardware combinations and the maximum number of PPP sessions and
L2TP tunnels that are supported in Cisco IOS XE Release 3.3. For information about the restrictions for
PPP sessions and L2TP tunnel scaling, see the
“Restrictions for PPP Sessions and L2TP Tunnel Scaling”
section on page 6-2.
Ta b l e 6-1 Maximum Number of PPP Sessions and L2TP Tunnels Supported on ASR 1000
Hardware
Chassis RP ESP PPP Session L2TP Tunnel
1001 Integrated ESP-2.5G or
ESP-5G
8000 4000
1002 Integrated
RP1
ESP-5G 12000 6000
1004, 1006 RP1 ESP-10G or
ESP-20G
24000 12000
1004, 1006 RP2 ESP-20G 32000 16000
1004, 1006, 1013 RP2 ESP-40G 32000
1
, 48000, or 64000 64000
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