Chapter 15: Interface IP Configuration
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Operational Guidelines
The C4/c CMTS can support multiple VRFs with the following restrictions:
Static routing is supported in all 11 VRFs
OSPFv2 can be supported in up to 5 VRFs
OSPFv3 can be supported in up to 5 VRFs
IS-IS can be supported in up to 5 VRFs
RIPv2 can be supported in up to 5 VRFs
BGP is supported in the default VRF.
Multiple protocols can operate in the same VRF (e.g., a common example is to have RIPv2 and OSPFv2 operate in the
same VRF with RIP being redistributed into OSPFv2).
Even though the CLI may allow for configurations beyond the restrictions described here (e.g., more than 11 VRFs),
those configurations are not supported.
Note: Up to a maximum of 64 VRFs are supported if MPLS L3VPN is used and if auto-import is disabled. If not, then a
maximum of only 32 VRFs is supported.
Overview of the Sample Procedure
The configuration example that follows is for demonstration purposes. Such a configuration is not likely to be encountered
in the field, but it serves to show what commands are available.
In the example below we use the default VRF and create four additional ones.
This sample procedure has RIP being redistributed into OSPF and OSPF being redistributed into RIP in every VRF. This is
not a recommended configuration. MSOs might configure one VRF with RIP into OSPF and another VRF with OSPF into
RIP, but in most cases you will see only RIP redistributed into OSPF.
This procedure also has one RCM interface and one cable-mac in each VRF. You can have multiple interfaces (RCM or
cable-macs) in a VRF. One VRF does not have to match the other VRFs in terms of the number of interfaces. The default
VRF, for example, could have three RCM ports and four cable-macs. VRF1 could have only one RCM port and three
cable-macs, and so on.