Installation guide

24
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.1 T
78-10643-04 Rev. B0
New and Changed Information
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MPLS VPN Support for Subinterfaces and Interface Bundles
Cisco IOS Release 12.1(2)T includes MPLS support as part of its VPN offerings for cable subinterfaces
and interface bundles. The software offers enhancements made to tags placed on the fronts of packets
that contain forwarding information used to make switching decisions for cable interfaces and bundles.
This tag switching infrastructure combines advanced routing protocol capabilities to define IP VPNs by
selectively advertising IP reachability information to just those subscribers within the same VPN or
extranet on a cable interface.
The MPLS-VPN approach of creating VPNs for individual ISPs requires subinterfaces to be configured
on cable interfaces or bundles. Refer to the “Cable Subinterfaces and Interface Bundling” section on
page 33 for definitions of subinterfaces and interface bundles. One subinterface is required for each ISP.
The subinterfaces are tied to VPN Routing Forwarding (VRF) tables for respective ISPs.
Apart from creating one subinterface for an ISP, an additional subinterface is created on the cable
interface bound to the management VPN. The management VPN is the one that connects the
Cisco uBR7200 series to a Provider Enterprise (PE) router that connects to management servers such
as CNR and ToD. MPLS VPN support also allows interfaces to be bound to a VRF table where each
VRF belongs to an ISP. This allows Cisco uBR7200 series downstream and upstream plant segments to
be shared by multiple ISPs. PCs behind respective CMs obtain their IP addresses from the respective
ISP address pool. Traffic coming from those CMs is routed to the ISP’s point of interconnect router.
For MPLS commands, refer to Cisco MPLS VPN Solutions Command Reference.
The Cisco uBR7200 series support a CM-to-cable subinterface association by mapping the SIDs that
are assigned to that CM to the subinterface. This mapping is created by gleaning DHCP reply messages
meant for the PC. The IP address stored in the DHCP reply is matched for its subnet value against the
subnet value configured for each of the subinterfaces over a physical interface or a cable bundle. The
Table 7 Cable Modem Card LEDs
LED Label Color State Description
Enabled Green On Indicates that the cable modem card is operating normally:
receiving DC power from the router midplane and enabled for
operation.
N/A Off Either the card is shut down or the slot is not working.
Upstream Green On For each upstream port, indicates that the upstream path is
enabled.
N/A Off Either the port is not configured, shut down, or the slot is not
working.
Downstream Green On For each downstream port, indicates that the downstream path is
enabled.
N/A Off Either the port is not configured, shut down, or the slot is not
working.
MGR ACT
(MC16S only)
Green On With Release 12.0.7 XR2 or Release 12.1(1a)T1, indicates that a
spectrum group has been configured.
With Release 12.1.(2)T, indicates that the MC16S Spectrum
Management Card has initiated an upstream frequency hop from
a potentially “noisy” channel to a cleaner channel.
N/A Off Either the port is not configured, shut down, or the slot is not
working.