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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-05
Chapter1 Overview of Cisco uBR7200 Series Software
cops tcp window-size
Transparent LAN Services (TLS) and L2 Tunneling ATM/SIDs
Cisco IOS 12.3(9a)BC introduces support for the Transparent LAN Service over Cable feature on the
Cisco uBR7246VXR router. This feature enhances existing Wide Area Network (WAN) support to
provide more flexible Managed Access for multiple Internet service provider (ISP) support over a hybrid
fiber-coaxial (HFC) cable network.
This feature allows service providers to create a Layer 2 tunnel by mapping an upstream service identifier
(SID) to an ATM permanent virtual connection (PVC) or a Virtual Local Area Network (VLAN).
For additional information about configuring TLS on the Cisco uBR7246VXR router, refer to the
following document on Cisco.com:
• Transparent LAN Service over Cable
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a0080159396.html
Transparent LAN Services (TLS) and L2 Virtual Private Networks
Cisco IOS Release 12.3(13a)BC introduces the following changes or requirements for the TLS feature with
Layer 2 VPNs:
• When the TLS feature is used with Layer 2 VPNs, the participating cable modems must have the
Baseline Privacy Interface security feature (BPI) enabled. Otherwise, the Cisco CMTS drops such
Layer 2 traffic in the upstream or downstream.
• Information about Customer Premises Equipment (CPE) does not display in the output of the
showcable modem command.
Note Configuring ATM L2VPN or 802.1q for a particular cable modem removes any previous cable modem
configuration on the Cisco uBR7246VXR router. For example, if TLS with 802.1q is configured on the
router for a particular cable modem, and then you configure ATM L2VPN for the same cable modem,
the Cisco uBR7246VXR router supports the latter and removes the former with no additional warning
or system messages.
Refer to the following documents on Cisco.com for additional TLS information:
• TLS for the Cisco CMTS
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a008015939
6.html
• TLS Over Cable - TAC Document #60027
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_configuration_example09186a0
08029160d.shtml