Table Of Contents

Virtual Routing and Forwarding

Technology Description

VRF

VRF-Lite (Multi-VRF)

Information Model Objects (IMOs)

Virtual Routing Forwarding (VRF) Entity

Equivalent Routing Entry

Virtual Routing Entry

Multi Protocol BGP Entity

Equivalent Cross Virtual Routing Entry

Cross Virtual Routing Entry

Vendor-Specific Inventory and IMOs

Network Topology

Service Alarms

Virtual Routing and Forwarding

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This chapter describes the level of support that Cisco ANA provides for Virtual Routing and Forwarding (VRF), as follows:

•Technology Description

•Information Model Objects (IMOs)

•Vendor-Specific Inventory and IMOs

•Network Topology

•Service Alarms

Technology Description

VRF

Virtual Routing and Forwarding (VRF) is an IP technology that allows multiple instances of a routing table to coexist on the same router at the same time. Because the routing instances are independent, the same or overlapping IP addresses can be used without conflict. "VRF" is also used to refer to a routing table instance that can exist in one or multiple instances per each VPN on a Provider Edge (PE) router.

VRF-Lite (Multi-VRF)

VRF-Lite is an application based on VRF that extends the concept of VRF to the Customer Edge (CE) router on the customer's premises. It supports multiple, overlapping, independent routing and forwarding tables per customer.

Any routing protocol supported by normal VRF can be used in a VRF-Lite CE implementation. The CE supports traffic separation between customer networks. As there is no MPLS functionality on the CE, no label exchange happens between the CE and PE.

Information Model Objects (IMOs)

This section describes the following IMOs:

•Virtual Routing Forwarding (VRF) Entity (IVrf)

•Equivalent Routing Entry (IRoutingEntries)

•Virtual Routing Entry (IVrfEntry)

•Multi Protocol BGP Entity (IMpBgp)

•Equivalent Cross Virtual Routing Entry (ICrossVrf)

•Cross Virtual Routing Entry (ICrossVrfRoutingEntry)

Virtual Routing Forwarding (VRF) Entity

The Virtual Routing Forwarding (VRF) Entity object describes the routing and address resolution protocols' independent forwarding component of a MPLS-BGP based VPN router. It is bound by its Logical Sons attribute to all the Network layer IP Interface objects among which it is routing IP packets.

Table 11-1 Virtual Routing Forwarding (VRF) Entity (IVrf)  

Attribute Name	Attribute Description	Scheme	Polling Interval
Virtual Routing Table	Array of Equivalent Routing Entries	IPCore	Configuration
Exported Route Targets	Array of route target identifiers	IPCore	Configuration
Imported Route Targets	Array of route target identifiers	IPCore	Configuration
Address Families	List of the address families (IPv4, IPv6, or both)	IPCore	Configuration
Route Distinguisher	Route distinguisher	IPCore	Configuration
ARP Entity	Address Resolution Entity (ARP Entity) (see Internet Protocol)	IPCore	Configuration
Name	VRF name	IPCore	Configuration
Logical Sons	Array of all IP Interfaces among which this Virtual Routing Forwarding (VRF) Entity is routing IP packets	IPCore	N/A
Description	Description of the VRF	IPCore	Configuration
Import Route-map	Name of the VRF import route map used to import IP prefixes into the VRF.	IPCore	Configuration
Export Route-map	Name of the VRF export route map used to export IP prefixes from the VRF.	IPCore	Configuration

Equivalent Routing Entry

The Equivalent Routing Entry and Virtual Routing Entry objects describe a routing table's entries. Each is an array of Virtual Routing Entries sharing a single IP Subnetwork destination.

Table 11-2 Equivalent Routing Entry (IRoutingEntries)  

Attribute Name	Attribute Description	Scheme	Polling Interval
Routing Entries	Array of Virtual Routing Entries sharing a single destination	IPCore	Configuration

Virtual Routing Entry

Table 11-3 Virtual Routing Entry (IVrfEntry) 

Attribute Name	Attribute Description	Scheme	Polling Interval
Next Hop BGP Address	Next hop BGP IP address	IPCore	Configuration
Incoming and Outgoing Inner Label	Incoming and outgoing inner MPLS label	IPCore	Configuration
Outer Label	Outer MPLS label	IPCore	Configuration
Destination IP Subnet	Final destination IP subnet	IPCore	Configuration
Next Hop IP Address	Next hop IP address	IPCore	Configuration
Type	Route entry type (Null, Other, Invalid, Direct, Indirect, Static)	IPCore	Configuration
Routing Protocol Type	Routing protocol type (Null, Other, Local, Network Managed, ICMP, EGP, GGP, Hello, RIP, IS-IS, ES-IS, Cisco IGRP, BBN SPF IGP, OSPF, BGP, EIGRP)	IPCore	Configuration
Outgoing Interface Name	Outgoing IP interface name	IPCore	Configuration

Multi Protocol BGP Entity

The Multi Protocol BGP Entity object describes the BGP component of a MPLS-BGP based VPN router. It is bound by its Logical Sons attribute to all Virtual Routing Forwarding (VRF) Entity objects among which it is routing IP packets.

Table 11-4 Multi Protocol BGP Entity (IMpBgp)  

Attribute Name	Attribute Description	Scheme	Polling Interval
BGP Identifier	Border Gateway Protocol (BGP) identifier	IPCore	Configuration
Local Autonomous System	Local peer autonomous system	IPCore	Configuration
Cross Virtual Routing Table	Array of Equivalent Cross Virtual Routing Entry	IPCore	Configuration
BGP Neighbors	Array of BGP neighbor entries (see Routing Protocols)	IPCore	Configuration
Logical Sons	Array of all Virtual Routing Forwarding (VRF) Entity objects among which this Multi Protocol BGP Entity is routing IP packets	IPCore	N/A

Equivalent Cross Virtual Routing Entry

The Equivalent Cross Virtual Routing Entry and Cross Virtual Routing Entry objects describe the first dimension of a cross virtual routing table, as an array of Cross Virtual Routing Entry objects sharing a single Virtual Routing Forwarding (VRF) Entity destination.

Table 11-5 Equivalent Cross Virtual Routing Entry (ICrossVrf)  

Attribute Name	Attribute Description	Scheme	Polling Interval
Virtual Routing Entries	Array of Cross Virtual Routing Entry objects sharing a single destination	IPCore	Configuration
Virtual Routing Entity Name	Virtual Routing Entity (VRF) name	IPCore	Configuration

Cross Virtual Routing Entry

Table 11-6 Cross Virtual Routing Entry (ICrossVrfRoutingEntry)  

Attribute Name	Attribute Description	Scheme	Polling Interval
Outgoing Virtual Routing Entity Identifier	Outgoing virtual routing entity Object Identifier (OID)	IPCore	Configuration
Incoming and Outgoing Virtual Routing Tags	Incoming and outgoing virtual routing tags	IPCore	Configuration
Destination IP Subnet	Final destination IP subnet	IPCore	Configuration
Next Hop IP Address	Next hop IP address	IPCore	Configuration
Type	Route entry type (Null, Other, Invalid, Direct, Indirect, Static)	IPCore	Configuration
Routing Protocol Type	Routing protocol type (Null, Other, Local, Network Managed, ICMP, EGP, GGP, Hello, RIP, IS-IS, ES-IS, Cisco IGRP, BBN SPF IGP, OSPF, BGP, EIGRP)	IPCore	Configuration
Outgoing Interface Name	Outgoing IP interface name	IPCore	Configuration

Vendor-Specific Inventory and IMOs

There are no vendor-specific inventory or IMOs for this technology.

Network Topology

Cisco ANA discovers MPLS-BGP-based VPN network topology by searching for the existence of the local Virtual Routing Forwarding (VRF) Entity's imported route targets in any remote side's VRF entity exported route targets.

Service Alarms

The following alarm is supported for this technology:

•Duplicate IP on VPN Found/Duplicate IP on VPN Fixed. This alarm is disabled by default.

For detailed information about alarms and correlation, see the Cisco Active Network Abstraction 3.7 User Guide.