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Contents
- Virtual Router Redundancy Service
- Finding Feature Information
- Restrictions for VRRS
- Information About VRRS
- VRRS Overview
- Using VRRS with VRRP
- VRRS Servers and Clients
- VRRS Pathways and Pathway Manager
- VRRS Pathways
- VRRS Pathway Manager
- How to Configure VRRS
- Configuring VRRPv3 Control Groups
- Configuring VRRS Pathways
- Verifying VRRS
- Configuration Examples for VRRS
- Example: Configuring VRRPv3 Control Groups
- Example: Configuring VRRS pathways
- Additional References
- Feature Information for Virtual Router Redundancy Service
Virtual Router Redundancy Service
Virtual Router Redundancy Service (VRRS) provides a multiclient information abstraction and management service between the Virtual Router Redundancy Protocol (VRRP), VRRS pathways and optional VRRS clients. The VRRS multiclient service provides a consistent interface with VRRP by abstracting over several First Hop Redundancy Protocols (FHRPs) and providing an idealized view of their state. VRRS manages data updates, allowing interested clients to register in one place and receive updates for named VRRP groups.
VRRP acts as a server that pushes VRRP status information out to VRRS pathways, and all registered VRRS clients. Pathways and clients obtain status on all essential information provided by VRRP, including current and previous redundancy states, active and inactive Layer 2 and Layer 3 addresses, and, in some cases, information about other redundant gateways in the network. Pathways use this information in order to provide scaled first-hop gateway redundancy across scaled interface environments. VRRS clients will also use this information to provide stateless and stateful redundancy information to clients and protocols.
 Note | In this module, VRRP and VRRPv3 are used interchangeably. |
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Restrictions for VRRS
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VRRS plug-ins must be configured on subinterfaces that are not configured with VRRP, but which share a physical interface with a VRRP group it is following.
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VRRP Version 2 (VRRPv2) is configurable only on Gigabit Ethernet interfaces.
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VRRS is currently only available for use with VRRP Version 3 (VRRPv3).
Information About VRRS
VRRS Overview
VRRS improves the scalability of VRRP. VRRS provides a stateless redundancy service to VRRS pathways and applications (VRRS clients) by monitoring VRRP. VRRS provides a database of the current VRRP state and provides a "push" data service to the VRRS pathways and clients with which it communicates. VRRP acts as a VRRS server. VRRS clients are other Cisco processes or applications that use VRRP to provide or withhold a service or resource dependent upon the state of the group. VRRS pathways are special VRRS clients that use the VRRS database information in order to provide scaled first-hop gateway redundancy across scaled interface environments.
The VRRS by itself is limited to maintaining its own state. Linking a VRRS client to a VRRP group provides a mechanism that allows VRRS to provide a service to client applications so that they can implement stateless or stateful failover. Stateless failover is failover without syncing of state. Stateful failover requires communication with a nominated backup before failure so that operational data is not lost when failover occurs.
VRRS pathways operate in a similar way to clients, but are integrated with the VRRS architecture. They provide a means to scale first-hop gateway redundancy by allowing the user the opportunity to configure a virtual address across hundreds of interfaces. The "virtual gateway" state of a VRRS pathway follows the state of an FHRP VRRS server.
Using VRRS with VRRP
VRRP provides server support for VRRS. The VRRP server pushes state and status information to VRRS when an internal update occurs. VRRS updates its internal database upon receiving a server update, and then sends push notifications to each of the VRRS clients associated with the shared name. Clients are interested in the protocol state, virtual MAC (vMAC) address, and virtual IP address information associated with a group. The association name between a client and a VRRP group is a character name string. The information provided by VRRS allows clients to perform various activities that are dependent on the state of the associated VRRP group.
VRRP notifies VRRS of its current state (master, backup, or nonoperational initial state [INIT]). The VRRP state is then passed on to pathways or clients. A VRRP group should be configured with a name to activate VRRS. Pathways or clients should be configured with the same name to bind them with VRRS.
The VRRP group name associates the VRRP group with any clients that are configured as part of VRRS with the same name.
VRRS Servers and Clients
VRRP acts as the VRRS server. Pathways and clients act on the VRRP server state. When a VRRP group changes state, VRRS pathways and clients act by altering their behaviour (performing tasks such as shutting down interfaces or appending accounting logs) depending on the state received from VRRS.
VRRS Pathways and Pathway Manager
VRRS Pathways
- vMAC address insertion and removal into the hardware driver using MACdb.
- Virtual IP (vIP) insertion and removal using the IPv4 and IPv6 APIs.
- Provision to associate the vIP with the interface burned-in address (BIA) MAC.
- Provision to associate the vMAC address with the interface-owned vIP.
- Maintain the association of a vMAC with a vIP on a LAN using the Address Resolution Protocol (ARP) or Neighbor Discovery Protocol.
- Maintain the switching cache (content-addressable memory or [CAM]) of connected Layer 2 devices on the LAN.
- Checkpoints all data and the pathway state with a High Availability module.
A Pathway will provide some of the above features using its association with either the VRRS Pathway L2 Controller or the VRRS Pathway L3 Controller.
VRRS Pathway Manager
The VRRS Pathway Manager provides the following features:
- Creates an association between one or more VRRS pathway instances and a single VRRS database name entry.
- Pushes configuration and state information to associated registered pathways in response to a push from VRRS.
- Provides debugging and show output to the user. The output is related to the state and configuration of the VRRS pathway manager.
- Is Online Insertion and Removal (OIR)-aware and manages pathways that may be affected by OIR events.
- Is Virtual Routing and Forwarding (VRF)-aware and manages pathways that may be affected by VRF events.
How to Configure VRRS
Configuring VRRPv3 Control Groups
DETAILED STEPS
Configuring VRRS Pathways
DETAILED STEPS
| Command or Action | Purpose | |||
|---|---|---|---|---|
Step 1 |
enable
Example: Device> enable |
Enables privileged EXEC mode. | ||
Step 2 |
configure
terminal
Example: Device# configure terminal |
Enters global configuration mode. | ||
Step 3 |
fhrp
version
vrrp
v3
Example: Device(config)# fhrp version vrrp v3 |
Enables the ability to configure VRRPv3 and VRRS.
| ||
Step 4 |
interface
type
number
Example: Device(config)# interface vlan 42 |
Enters interface configuration mode. | ||
Step 5 |
ip address
ip-address
mask
Example: Device(config-if)# ip address 209.165.201.25 255.255.255.224 |
Configures the IP address on the interface. | ||
Step 6 |
vrrs
pathway
vrrs-leader-name
Example: Device(config-if)# vrrs pathway group1 |
Defines the VRRS pathway for a VRRS group and enters VRRS pathway configuration mode. | ||
Step 7 |
mac
address
mac-address
Example: Device(config-if-vrrs-pw)# mac address fe24.fe24.fe24 |
Specifies a MAC address used by a pathway. | ||
Step 8 |
address
ip-address
Example: Device(config-if-vrrs-pw)# address 209.165.201.10 |
Defines the virtual IP for a pathway. | ||
Step 9 |
end
Example: Device(config-if-vrrs-pw)# end |
Returns to privileged EXEC mode. |
Verifying VRRS
Perform this task to verify VRRS functions.
Note | The show commands are not in any specific order. The show vrrs pathway command for different pathway states (active, inactive, and "not ready") is displayed below. |
DETAILED STEPS
| Step 1 |
enable
Enables privileged EXEC mode. Example: Device> enable
| ||||||||||||||||||||||||||||||||||||||||
| Step 2 |
show
vrrs
pathway
Displays VRRS pathway information for an active pathway with the tag name "group1" and VRRP in master state on the VLAN interface. Example:
Device# show vrrs pathway
Pathway ["group1"@Vlan42]
State is ACTIVE [VRRS push "ACTIVE"]
Virtual MAC is fe24.fe24.fe24 [Active] (0)
Address-family is v4
Options: Default Pathway=0, Owner Mode=0, Accept-Mode=1, Configured vMAC=1
Evaluation: No Shut=1, Connected=1, OIR=1, L2 Ready=1, L3 Ready=1, vMAC Ready=1,
vIP Ready=1
Virtual Address List: 209.165.201.10
| ||||||||||||||||||||||||||||||||||||||||
| Step 3 |
show
vrrs
pathway
Displays VRRS pathway information for an inactive pathway with the tag name "group1" and VRRP in backup state on the Ethernet 0/1 interface. Example:
Device# show vrrs pathway
Pathway ["group1"@Et0/1]
State is INACTIVE [VRRS push "BACKUP"]
Virtual MAC is 0101.0101.0101 [Reserved] (0)
Address-family is v4
Options: Default Pathway=0, Owner Mode=0, Accept-Mode=1, Configured vMAC=1
Evaluation: No Shut=1, Connected=1, OIR=1, L2 Ready=1, L3 Ready=1, vMAC Ready=1,
vIP Ready=1
Virtual Address List: 209.165.201.10
| ||||||||||||||||||||||||||||||||||||||||
| Step 4 |
show
vrrs
pathway
Displays VRRS pathway information for a "not ready" pathway with the tag name "group1" and VRRP in backup state on the Ethernet 0/1 interface. Example:
Device# show vrrs pathway
Pathway ["group1"@Et0/1]
State is NOT READY [VRRS push "INIT"]
Virtual MAC is 0101.0101.0101 [Reserved] (0)
Address-family is v4
Options: Default Pathway=0, Owner Mode=0, Accept-Mode=1, Configured vMAC=1
Evaluation: No Shut=1, Connected=1, OIR=1, L2 Ready=1, L3 Ready=1, vMAC Ready=1,
vIP Ready=1
Virtual Address List: 209.165.201.10
| ||||||||||||||||||||||||||||||||||||||||
| Step 5 |
show
vrrs
server
Displays VRRS server information. Example:
Device# show vrrs pathway
Pathway ["group1"@Et0/1]
State is INACTIVE [VRRS push "BACKUP"]
Virtual MAC is 0101.0101.0101 [Reserved] (0)
Address-family is v4
Options: Default Pathway=0, Owner Mode=0, Accept-Mode=1, Configured vMAC=1
Evaluation: No Shut=1, Connected=1, OIR=1, L2 Ready=1, L3 Ready=1, vMAC Ready=1,
vIP Ready=1
Virtual Address List: 209.165.201.10
The table below describes significant fields in the sample output:
|
Configuration Examples for VRRS
Example: Configuring VRRPv3 Control Groups
The following example shows how to configure a VRRPv3 control group:
Device> enable Device# configure terminal Device(config)# fhrp version vrrp v3 Device(config)# interface vlan 40 Device(config-if)# ip address 209.165.200.230 255.255.255.224 Device(config-if)# vrrp 1 address-family ipv4 Device(config-if-vrrp)# address 209.165.202.141 Device(config-if-vrrp)# vrrs leader group1 Device(config-if-vrrp)# end
Note | In the above example, the fhrp version vrrp v3 command is used in global configuration mode. |
Example: Configuring VRRS pathways
The following example shows how to configure a VRRS pathway:
Device> enable Device# configure terminal Device(config)# fhrp version vrrp v3 Device(config)# interface vlan 42 Device(config-if)# ip address 209.165.201.25 255.255.255.224 Device(config-if)# vrrs pathway group1 Device(config-if-vrrs-pw)# mac address fe24.fe24.fe24 Device(config-if-vrrs-pw)# address 209.165.201.10 Device(config-if-vrrs-pw)# end
Note | In the above example, the fhrp version vrrp v3 command is used in global configuration mode. |
Additional References
Related Documents
Technical Assistance
| Description | Link |
|---|---|
|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for Virtual Router Redundancy Service
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
| Table 1 | Feature Information for Virtual Router Redundancy Service |
| Feature Name | Releases | Feature Information |
|---|---|---|
|
Virtual Router Redundancy Service |
Cisco IOS XE Release 3.8S |
The VRRS feature provides a multiclient information abstraction and management service between VRRP, VRRS pathways, and optional VRRS clients The following commands were introduced or modified: debug vrrs all, debug vrrs database, debug vrrs log, debug vrrs pathway, and show vrrs. |