Chapter 43: BSoD L2VPN
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 1080
Additional Information
Customers using the ARRIS implementation of BSoD L2VPN should be aware of the following:
The ARRIS CMTS provides the point-to-point L2VPN service model but not the point-to-multipoint model described in
the DOCSIS spec.
Each modem using BSoD must have a unique config file with its own unique Q-tag or Q-tag pair.
Modems using BSoD must have BPI+ enabled.
The chassis must be equipped with the following modules: RCM, 16D CAMs or XD CAMs, and 12U or 24U CAMs.
Single and Dual Q-tags are supported, other types of Network System Interface (NSI) encapsulation are not supported.
The CMTS supports a maximum of 16,000 dual-tag L2VPNs.
The CMTS supports a maximum of 4,093 single-tag L2VPNs.
FlexPath bonded modems do not support this feature.
The use of L2VPN non-compliant modems is permitted in this implementation per the DOCSIS BSoD spec, but results in
leaky L2VPN tunnels which fail to exclude unencrypted ARP and IP broadcasts. If you wish to configure BSoD using non-
compliant modems, and if these non-compliant modems are PPPoE clients, then the leakage is benign because such
clients ignore non-PPPoE traffic.
BSoD tunnels are not considered to be a part of general ISP traffic; therefore, they are not included in Legal Intercept
captures.
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