Table Of Contents
Release Notes for the Cisco 10000 Series ESR
for Cisco IOS Release 12.2(2)BY2
February 21, 2002
These release notes provide information about Cisco IOS Release 12.2(2)BY2, which provides broadband aggregation features for the Cisco 10000 series edge services router (ESR). These release notes are identical to the release notes for Cisco IOS Release 12.2(2)BY1, but were updated to include fixes for caveats discovered and resolved since the release of Cisco IOS Release 12.2(2)BY1 (see the "Resolved Problems in Cisco IOS Release 12.2(2)BY2" section).
These release notes are updated as needed to describe new features, memory requirements, hardware support, software platform deferrals, and changes to the microcode and related documents.
Cisco IOS Release 12.2(2)BY2 is based on the following releases:
•Cisco IOS Release 12.2(2)BY1
•Cisco IOS Release 12.0(19)SL for features specific to the Cisco 10000 series ESR
•Cisco IOS Release 12.2B for platform-independent features
For a list of the software caveats that apply to Cisco IOS Release 12.2(2)BY2, see the "Caveats in Cisco IOS Release 12.2(2)BY1" section.
To review the release notes for Cisco IOS Release 12.0(19SL, go to www.cisco.com and click Technical Documents > Aggregation > Cisco 10000 Series Edge Services Routers > Cisco 10000 Series ESR Release Notes > Release Notes for the Cisco 10000 Series ESR for Cisco IOS Release 12.0(19)SL.
To review the release notes for Cisco IOS Release 12.2, go to www.cisco.com and click Technical Documents. Select Release 12.2 from the Cisco IOS Software drop-down menu. Then click Cisco IOS Release Notes > Cisco IOS Release 12.2.
This document contains the following sections:
Upgrading to a New Software Release
For specific information about upgrading your Cisco 10000 series ESR to a new software release, see the Cisco 10000 Series ESR Software Configuration Guide.
For general information about upgrading to a new software release, see the product bulletin Cisco IOS Upgrade Ordering Instructions located at:
For additional information about ordering Cisco IOS software, refer to the Cisco IOS Software Releases URL:
This broadband aggregation image requires that you have the PRE1 version (part number ESR-PRE1) of the Performance Routing Engine (PRE) installed in the Cisco 10000 series ESR chassis. You can verify which PRE is installed in the ESR by using the show version command.
New Features in Cisco IOS Release 12.2(2)BY1
This release of Cisco IOS software brings broadband aggregation to the Cisco 10000 series ESR, and enables the router to emulate an L2TP Network Server (LNS)/home gateway upstream from a DSL access network. In this role, the ESR connects to an L2TP Access Concentrator (LAC), terminates the point-to-point protocol (PPP) layer, and assigns a network layer configuration to the remote client. The ESR then routes or forwards the remote client data to the backbone network.
The following new features and improvements are supported in Cisco IOS Release 12.2(2)BY1 to provide broadband aggregation. If you need more information on configuring these features, see the Cisco IOS Wide-Area Networking Configuration Guide, Release 12.2.
In addition to the standard protocols supported by the Cisco 10000 series ESR, this release supports the following protocols for broadband aggregation:
•PPP sessions encapsulated in L2TP tunnels
•Routing with Bridged Encapsulations (RBE)
•PPPoX and RBE autosense for LLC/SNAP encapsulation
•PPPoX autosense for SNAP
•PPPoA autosense for MUX encapsulation
•PPPoE and RBE on a VC
Scalability for broadband aggregation for the Cisco 10000 series ESR includes support for the following:
•Up to 32,000 L2TP tunneled PPP sessions or PTA subscribers
•Up to 32,000 VCs (in high VC Count mode only).
•Up to 4,000 VCs (with full functionality)
•Up to 3200 tunnels
AAA and Address Assignment
The following new AAA and address assignment features are supported in this release:
•RADIUS based authentication
•IP address assignment from local pools (both configured using CLI and downloaded using RADIUS)
•IP address assignment from RADIUS servers (as part of AAA)
•DHCP relay agent support for unnumbered interfaces
•RADIUS request with VPI/VCI information
Accounting, Network Management, and Configuration
New router accounting, management, and configuration features in this release include:
•Range based CLI
•Support for Cisco-VPDN-MGMT-MIB
•RADIUS interim accounting
•RADIUS VPI/VCI accounting
•Configuration using RADIUS AV pairs
Cisco 10000 Series ESR Software Features
Table 1 lists the leased line features based on Cisco IOS Release 12.0(19)SL, and supported in the Cisco 10000 series ESR.
Limitations and Restrictions
This section describes any limitations and restrictions that you should review before you use the Cisco 10000 series ESR.
Features Removed to Enable Broadband Aggregation
To add broadband aggregation to this release, it was necessary to remove some software features that are standard features in the Cisco 10000 series ESR. The following software features were removed:
•Multi Link Frame Relay
Applying ACLs to Virtual Access Interfaces
In Cisco IOS Release 12.2(2)BY1, if you apply an ACL to a virtual access interface template, the ACL is ignored and has no effect.
Controlling the Rate of Logging Messages
It is important that you limit the rate that system messages are logged by the Cisco 10000 series ESR. This helps to avoid a situation in which the router becomes unstable and the CPU is overloaded. To control the output of messages from the system, use the logging rate-limit command.
We recommend that you configure the logging rate-limit command as follows:Router(config)# logging rate-limit console all 10 except critical
This rate-limits all messages to the console to 10 per second, except for messages with critical priority (level 3) or greater.
For more information on the logging rate-limit command, see the Cisco IOS Configuration Fundamentals Command Reference.
Testing Performance of High-Speed Interfaces
Cisco IOS software running on the Cisco 10000 series ESR has multiple queues for all classes of traffic over high-speed interfaces. The software selects a queue based on the source and destination address for the packet. This ensures that a traffic flow always uses the same queue and the packets are transmitted in proper order.
When the Cisco 10000 series ESR is installed in a real network, the high-speed interfaces work efficiently to spread traffic flow equally over the queues. However, using single traffic streams in a laboratory environment may result in less-than-expected performance.
Therefore, to ensure accurate test results, you should test the throughput of the gigabit Ethernet, POS, or ATM uplink with multiple source or destination addresses.
Tip To determine if traffic is being properly distributed, use the show hardware pxf cpu queue command.
This section contains important issues that you should be aware of with Cisco IOS Release 12.2(2)BY1 and previous releases.
High VC Count Mode
The new High VC Count mode enables the Cisco 10000 series ESR to support 32,000 VCs with PPPoE, PPPoA, or RBE protocols. The High VC Count mode is set on a per-port basis, and imposes certain limitations, regardless of how the VCs are defined. The following limitations apply in High VC Count mode:
•ACLs and Service-Policies only apply to the physical interface, not to individual VCs
•All VCs on a physical interface must reside in the same VRF
•PVC Discovery is not supported.
•OAM Management is not supported.
To set the router to High VC Count mode, use the no atm pxf queuing command.
The following example shows High VC Count mode enabled on an atm port:Router(config)# interface atm 2/0/3Router(config-if)# no atm pxf queuing
Provisioning for Scaling
Cisco engineers have identified several configuration parameters that enable the Cisco 10000 series ESR to scale the configuration. Please ensure that you have the following commands and parameters in your configuration.
If you plan on running RADIUS authentication, set the small, middle, and big buffers to 15000, 12000, and 8000, respectively. You can use the buffers command to do this. For example:Router(config)# buffers small perm 15000Router(config)# buffers mid perm 12000Router(config)# buffers big perm 8000
For typical RADIUS servers, if the RADIUS server is only a few hops away from the router, we recommend that you set the RADIUS server retransmit rate to 5, and the RADIUS server timeout rate to 15, by using the radius-server command. For example:Router(config)# radius-server retransmit 5Router(config)# radius-server timeout 15
L2TP Tunnel Settings
It is mandatory that you configure an L2TP tunnel password with Cisco IOS Release 12.2(2)BY1. You can do this by using the l2tp tunnel password command. For example:Router(config)# vpdn-group tunnel1Router(config-if)# l2tp tunnel password 7
The nosession-timeout command determines how long a tunnel will persist when there are no sessions in it. You should set this timeout to 30. For example:Router(config)# vpdn-group tunnel1Router(config-if)# l2tp tunnel nosession-timeout 30
You should also configure the L2TP tunnel receive window to 100, with the minimum retransmit timeout of 2, and a maximum retransmit timeout of 8. For example:Router(config)# vpdn-group tunnel1Router(config-if)# l2tp tunnel receive-window 100Router(config-if)# l2tp tunnel retransmit timeout min 2Router(config-if)# l2tp tunnel retransmit timeout max 8
If you configure ATM subinterfaces for L2TP tunnels, configure aal5snap encapsulation to avoid a condition where a flapping interface could cause the system to be overloaded with ARP requests. You can do this using the encapsulation command. For example:Router(config)# interface atm 5/0/0.4Router(config-if-atm-vc)# encaps aal5snap
To keep the LNS from timing out a PPP authentication process, you should set the ppp timeout to 100 by using the ppp timeout authentication command. For example:Router(config)# interface Virtual-Template1Router(config-if)# ppp timeout authentication 100
Cisco Discovery Protocol
The Cisco Discovery Protocol (CDP) is disabled by default. To maximize scalability with the Cisco 10000 series ESR when running the Cisco IOS Release 12.2(2)BY1 broadband aggregation image, do not enable CDP.
Gratuitous ARP Requests
To maximize the performance of the router, you need to disable gratuitous ARP requests, by using the no ip gratuitous-arp command. For example:Router(config)# no ip gratuitous-arp
The keepalive command is an interface-specific command. If you configure a virtual-template with any form of the keepalive command, including the no keepalive command, or the keepalive [seconds] command, the subinterfaces will not be used with that virtual-template interface.
Trunk Interface Input Queue
To ensure high scalability, you should set the trunk interface input hold queue to a high value. For example:Router(config)# int gig1/0/0Router(config-if)# hold-queue 4096 in
Note The OC-12 ATM line card trunk interface input hold queue defaults to 27230, and in Cisco laboratory tests, the OC-12 ATM line card has achieved the highest scalability at this setting. We recommend that you do not change the default setting.
AAA Authentication on the NME Port
If you use AAA authentication on the NME port, set both the in and out interface hold queues to 4096. For example:Router(config)# int fe 0/1Router(config-if)# hold-queue 4096 inRouter(config-if)# hold-queue 4096 out
Virtual Templates and PPP Session Scaling
If you configure a virtual template using interface-specific commands, the Cisco 10000 series ESR does not achieve the highest possible PPP session scaling. To verify that the router has no interface-specific commands within the virtual-template configuration that would limit PPP scaling, use the test virtual-template <number> sub interface command.
In the following example, the output of the test virtual-template <number> sub interface command indicates that subinterfaces cannot be created using the virtual template. Two interface-specific commands are set: carrier-delay and ip rtp priority.Router(config)# test virtual-template 11 subinterfaceSubinterfaces cannot be created using Virtual-Template11Interface specific commands:carrier-delay 45ip rtp priority 2000 2010 500
If you do not use the SNMP management tools of the router to monitor PPP sessions, you can prevent the virtual-access subinterfaces from being registered with the SNMP functionality of the router and using memory by using the no virtual-template snmp command. For example:Router(config)# no virtual-template snmp
Table 2 lists interface-specific commands that prevent the Cisco 10000 series ESR from attaining the highest possible PPP session scaling.
Inserting a New Line Card
Unlike other Cisco routers, if you insert a new or different line card into a Cisco 10000 series ESR chassis slot that previously had a line card installed, the line card initially reports that it is administratively up.
Resolved Problems in Cisco IOS Release 12.2(2)BY2
This section lists problems found since the release of Cisco IOS Release 12.2(2)BY1, and are fixed in Cisco IOS Release 12.2(2)BY2.
An error can occur with management protocol processing. Please use the following URL for further information:
Caveats in Cisco IOS Release 12.2(2)BY1
Table 3 describes the caveats for the Cisco 10000 series ESR running Cisco IOS Release 12.2(2)BY1.
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