-
This documentation has been moved.
-
Implementing IPv6 Addressing and Basic Connectivity
-
Implementing DHCP for IPv6
-
Implementing EIGRP for IPv6
-
Configuring First Hop Redundancy Protocols in IPv6
-
Implementing First Hop Security in IPv6
-
Implementing IS-IS for IPv6
-
Implementing IPv6 for Network Management
-
Implementing Mobile IPv6
-
Implementing IPv6 Multicast
-
Implementing Multiprotocol BGP for IPv6
-
Implementing NetFlow for IPv6
-
Implementing OSPF for IPv6
-
Implementing IPv6 over MPLS
-
Implementing IPv6 VPN over MPLS
-
Implementing Policy-Based Routing for IPv6
-
Implementing QoS for IPv6
-
Implementing RIP for IPv6
-
Implementing Static Routes for IPv6
-
Implementing Traffic Filters and Firewalls for IPv6 Security
-
Implementing Tunneling for IPv6
-
Feedback
Table Of Contents
Configuring First Hop Redundancy Protocols
in IPv6Prerequisites for First Hop Redundancy Protocols in IPv6
Information About First Hop Redundancy Protocols in IPv6
GLBP Virtual MAC Address Assignment
GLBP Virtual Gateway Redundancy
GLBP Virtual Forwarder Redundancy
GLBP Gateway Weighting and Tracking
HSRP IPv6 Virtual MAC Address Range
How to Configure First Hop Redundancy Protocols in IPv6
Configuring and Customizing GLBP
Configuring GLBP Authentication
Configuring GLBP Weighting Values and Object Tracking
Enabling an HSRP Group for IPv6 Operation
Enabling and Verifying an HSRP Group for IPv6 Operation
Configuration Examples for First Hop Redundancy Protocols in IPv6
Example: Customizing GLBP Configuration:
Example: GLBP MD5 Authentication Using Key Strings
Example: GLBP MD5 Authentication Using Key Chains
Example: GLBP Text Authentication
Example: Enabling GLBP Configuration
Example: Enabling and Verifying an HSRP Group for IPv6 Operation
Example: Configuration and Verification for an HSRP Group
Example: Configuring HSRP Global IPv6 Addresses
Feature Information for First Hop Redundancy Protocols in IPv6
Configuring First Hop Redundancy Protocols
in IPv6
First Published: November 28, 2006Last Updated: September 26, 2011IPv6 routing protocols ensure router-to-router resilience and failover. However, in situations in which the path between a host and the first-hop router fails, or the first-hop router itself fails, first hop redundancy protocols (FHRPs) ensure host-to-router resilience and failover.
The Gateway Load Balancing Protocol (GLBP) FHRP protects data traffic from a failed router or circuit, while allowing packet load sharing between a group of redundant routers. The Hot Standby Router Protocol (HSRP) protects data traffic in case of a gateway failure.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see 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 for First Hop Redundancy Protocols in IPv6" section.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
•
Prerequisites for First Hop Redundancy Protocols in IPv6
•
•
•
•
Prerequisites for First Hop Redundancy Protocols in IPv6
•
•
•
Information About First Hop Redundancy Protocols in IPv6
GLBP for IPv6
•
•
•
•
GLBP for IPv6 Overview
The Gateway Load Balancing Protocol feature provides automatic router backup for IPv6 hosts configured with a single default gateway on an IEEE 802.3 LAN. Multiple first hop routers on the LAN combine to offer a single virtual first-hop IPv6 router while sharing the IPv6 packet forwarding load. GLBP performs a similar function for the user as HSRP. HSRP allows multiple routers to participate in a virtual router group configured with a virtual IPv6 address. One member is elected to be the active router to forward packets sent to the virtual IPv6 address for the group. The other routers in the group are redundant until the active router fails. These standby routers have unused bandwidth that the protocol is not using. Although multiple virtual router groups can be configured for the same set of routers, the hosts must be configured for different default gateways, which results in an extra administrative burden. The advantage of GLBP is that it additionally provides load balancing over multiple routers (gateways) using a single virtual IPv6 address and multiple virtual MAC addresses. The forwarding load is shared among all routers in a GLBP group rather than being handled by a single router while the other routers stand idle. Each host is configured with the same virtual IPv6 address, and all routers in the virtual router group participate in forwarding packets.
GLBP Benefits
GLBP for IPv6 provides the following benefits:
Load Sharing
You can configure GLBP in such a way that traffic from LAN clients can be shared equitably among multiple routers.
Multiple Virtual RoutersGLBP supports up to 1024 virtual routers (GLBP groups) on each physical interface of a router and up to four virtual forwarders per group.
Preemption
The redundancy scheme of GLBP enables you to preempt an active virtual gateway with a higher priority backup virtual gateway that has become available. Forwarder preemption works in a similar way, except that forwarder preemption uses weighting instead of priority and is enabled by default.
Authentication
You can also use the industry-standard Message Digest algorithm 5 (MD5) algorithm for improved reliability, security, and protection against GLBP-spoofing software. A router within a GLBP group with a different authentication string than other routers will be ignored by other group members. You can alternatively use a simple text password authentication scheme between GLBP group members to detect configuration errors.
GLBP Active Virtual Gateway
Members of a GLBP group elect one gateway to be the active virtual gateway (AVG) for that group. Other group members provide backup for the AVG in the event that the AVG becomes unavailable. The function of the AVG is that it assigns a virtual MAC address to each member of the GLBP group. Each gateway assumes responsibility for forwarding packets sent to the virtual MAC address assigned to it by the AVG. These gateways are known as active virtual forwarders (AVFs) for their virtual MAC address.
The IPv6 neighbor discovery process uses Internet Control Message Protocol (ICMP) in IPv6 messages and solicited-node multicast addresses to determine the link-layer address of a neighbor on the same network (local link), verify the reachability of a neighbor, and track neighboring routers. The IPv6 neighbor discovery process uses ICMPv6 messages and solicited-node multicast addresses to determine the link-layer address of a neighbor on the same network (local link), verify the reachability of a neighbor, and track neighboring routers. The AVG is responsible for answering ICMPv6 Neighbor Discovery requests for the virtual IPv6 address. Load sharing is achieved by the AVG replying to the ICMPv6 Neighbor Discovery requests with different virtual MAC addresses.
In Figure 1, Router A is the AVG for a GLBP group, and is responsible for the IPv6 link-local address FE80::260:3EFF:FE11:6770. Router A is also an AVF for the virtual MAC address 0007.b400.0101. Router B is a member of the same GLBP group and is designated as the AVF for the virtual MAC address 0007.b400.0102. Client 1 has a default gateway IPv6 address of FE80::260:3EFF:FE11:6770 and a gateway MAC address of 0007.b400.0101. Client 2 shares the same default gateway IP address but receives the gateway MAC address 0007.b400.0102 because Router B is sharing the traffic load with Router A.
Figure 1 GLBP Topology
If Router A becomes unavailable, Client 1 will not lose access to the WAN because Router B will assume responsibility for forwarding packets sent to the virtual MAC address of Router A, and for responding to packets sent to its own virtual MAC address. Router B will also assume the role of the AVG for the entire GLBP group. Communication for the GLBP members continues despite the failure of a router in the GLBP group.
GLBP Virtual MAC Address Assignment
A GLBP group allows up to four virtual MAC addresses per group. The AVG is responsible for assigning the virtual MAC addresses to each member of the group. Other group members request a virtual MAC address after they discover the AVG through hello messages. Gateways are assigned the next MAC address in sequence. A virtual forwarder that is assigned a virtual MAC address by the AVG is known as a primary virtual forwarder. Other members of the GLBP group learn the virtual MAC addresses from hello messages. A virtual forwarder that has learned the virtual MAC address is referred to as a secondary virtual forwarder.
GLBP Virtual Gateway Redundancy
GLBP operates virtual gateway redundancy in the same way as HSRP. One gateway is elected as the AVG, another gateway is elected as the standby virtual gateway, and the remaining gateways are placed in a listen state.
If an AVG fails, the standby virtual gateway will assume responsibility for the virtual IPv6 address. A new standby virtual gateway is then elected from the gateways in the listen state.
GLBP Virtual Forwarder Redundancy
GLBP virtual forwarder redundancy is similar to virtual gateway redundancy with an AVF. If the AVF fails, one of the secondary virtual forwarders in the listen state assumes responsibility for the virtual MAC address.
The new AVF is also a primary virtual forwarder for a different forwarder number. GLBP migrates hosts away from the old forwarder number using two timers that start as soon as the gateway changes to the active virtual forwarder state. GLBP uses the hello messages to communicate the current state of the timers.
The redirect time is the interval during which the AVG continues to redirect hosts to the old virtual forwarder MAC address. When the redirect time expires, the AVG stops using the old virtual forwarder MAC address in ICMPv6 ND replies, although the virtual forwarder will continue to forward packets that were sent to the old virtual forwarder MAC address.
The secondary hold time is the interval during which the virtual forwarder is valid. When the secondary hold time expires, the virtual forwarder is removed from all gateways in the GLBP group. The expired virtual forwarder number becomes eligible for reassignment by the AVG.
GLBP Gateway Priority
GLBP gateway priority determines the role that each GLBP gateway plays and the results if the AVG fails.
Priority also determines if a GLBP router functions as a backup virtual gateway and the order of ascendancy to becoming an AVG if the current AVG fails. You can configure the priority of each backup virtual gateway with a value of 1 through 255 using the glbp priority command.
In Figure 1, if Router A—the AVG in a LAN topology—fails, an election process takes place to determine which backup virtual gateway should take over. In this example, Router B is the only other member in the group so it will automatically become the new AVG. If another router existed in the same GLBP group with a higher priority, then the router with the higher priority would be elected. If both routers have the same priority, the backup virtual gateway with the higher IPv6 address would be elected to become the active virtual gateway.
By default, the GLBP virtual gateway preemptive scheme is disabled. A backup virtual gateway can become the AVG only if the current AVG fails, regardless of the priorities assigned to the virtual gateways. You can enable the GLBP virtual gateway preemptive scheme using the glbp preempt command. Preemption allows a backup virtual gateway to become the AVG, if the backup virtual gateway is assigned a higher priority than the current AVG.
GLBP Gateway Weighting and Tracking
GLBP uses a weighting scheme to determine the forwarding capacity of each router in the GLBP group. The weighting assigned to a router in the GLBP group can be used to determine whether it will forward packets and, if so, the proportion of hosts in the LAN for which it will forward packets. Thresholds can be set to disable forwarding when the weighting falls below a certain value. When the weighting rises above another threshold, forwarding is automatically reenabled.
The GLBP group weighting can be automatically adjusted by tracking the state of an interface within the router. If a tracked interface goes down, the GLBP group weighting is reduced by a specified value. Different interfaces can be tracked to decrement the GLBP weighting by varying amounts.
By default, the GLBP virtual forwarder preemptive scheme is enabled with a delay of 30 seconds. A backup virtual forwarder can become the AVF if the current AVF weighting falls below the low weighting threshold for 30 seconds. You can disable the GLBP forwarder preemptive scheme using the no glbp forwarder preempt command or change the delay using the glbp forwarder preempt delay minimum command.
HSRP for IPv6
•
HSRP for IPv6 Overview
The HSRP is an FHRP designed to allow for transparent failover of the first-hop IP router. HSRP provides high network availability by providing first-hop routing redundancy for IP hosts on Ethernet configured with a default gateway IP address. HSRP is used in a group of routers for selecting an active router and a standby router. In a group of router interfaces, the active router is the router of choice for routing packets; the standby router is the router that takes over when the active router fails or when preset conditions are met.
IPv6 hosts learn of available IPv6 routers through IPv6 neighbor discovery RA messages. These are multicast periodically, or may be solicited by hosts. HSRP is designed to provide only a virtual first hop for IPv6 hosts.
An HSRP IPv6 group has a virtual MAC address that is derived from the HSRP group number, and a virtual IPv6 link-local address that is, by default, derived from the HSRP virtual MAC address. Periodic RAs are sent for the HSRP virtual IPv6 link-local address when the HSRP group is active. These RAs stop after a final RA is sent when the group leaves the active state.
Periodic RAs for the interface link-local address stop after a final RA is sent while at least one virtual IPv6 link-local address is configured on the interface. No restrictions occur for the interface IPv6 link-local address other than that mentioned for the RAs. Other protocols continue to receive and send packets to this address.
HSRP uses a priority mechanism to determine which HSRP configured router is to be the default active router. To configure a router as the active router, you assign it a priority that is higher than the priority of all the other HSRP-configured routers. The default priority is 100, so if you configure just one router to have a higher priority, that router will be the default active router.
HSRP IPv6 Virtual MAC Address Range
HSRP IPv6 uses a different virtual MAC address block than does HSRP for IP:
0005.73A0.0000 through 0005.73A0.0FFF (4096 addresses)
HSRP IPv6 UDP Port Number
Port number 2029 has been assigned to HSRP IPv6.
HSRP Global IPv6 Address
The HSRP global IPv6 address feature allows users to configure multiple nonlink local addresses as virtual addresses, and it allows for the storage and management of multiple global IPv6 virtual addresses in addition to the existing primary link-local address. If an IPv6 address is used, it must include an IPv6 prefix length. If a link-local address is used, it must not have a prefix.
Figure 2 depicts a deployment scenario that uses an HSRP IPv6 global virtual interface:
Figure 2 Scenario Using Gan HSRP IPv6 Global Virtual Interface
In Figure 2, the provider equipment (PE) routers need to inject a route to reach the customer premises equipment (CPE) from the backbone routers. Because there are two CPEs, HSRP is convenient to use. The static route will be set with a link-local next hop (FE80::1:1:1:CAFE). If this address is injected in the backbone, this route is useless with a link-local next hop, as link-local addresses only have scope within the Layer 2 local LAN space. To address this issue, the next hop of the static route toward the virtual address must be set to a nonlink-local address, so backbone routers can route packets to the PE routers. At the next-hop address resolution, the active HSRP group member will reply to neighbor solicitation (NS) messages sent to the nonlink-local address.
How to Configure First Hop Redundancy Protocols in IPv6
•
•
Configuring and Customizing GLBP
Customizing GLBP behavior is optional. Be aware that as soon as you enable a GLBP group, that group is operating. It is possible that if you first enable a GLBP group before customizing GLBP, the router could take over control of the group and become the AVG before you have finished customizing the feature. Therefore, if you plan to customize GLBP, it is a good idea to do so before enabling GLBP.
This section contains the following optional procedures:
•
•
Customizing GLBP
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
DETAILED STEPS
Configuring GLBP Authentication
The following sections describe configuration tasks for GLBP authentication. The task you perform depends on whether you want to use text authentication, a simple MD5 key string, or MD5 key chains for authentication.
•
•
•
GLBP MD5 authentication provides greater security than the alternative plain text authentication scheme. MD5 authentication allows each GLBP group member to use a secret key to generate a keyed MD5 hash that is part of the outgoing packet. A keyed hash of an incoming packet is generated and, if the hash within the incoming packet does not match the generated hash, the packet is ignored.
The key for the MD5 hash can either be given directly in the configuration using a key string or supplied indirectly through a key chain.
A router will ignore incoming GLBP packets from routers that do not have the same authentication configuration for a GLBP group. GLBP has three authentication schemes:
•
•
•
GLBP packets will be rejected in any of the following cases:
•
•
•
Configuring GLBP MD5 Authentication Using a Key String
Configuring GLBP MD5 authentication protects the router against spoofing software and uses the industry-standard MD5 algorithm for improved reliability and security.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
DETAILED STEPS
Configuring GLBP MD5 Authentication Using a Key Chain
Key chains allow a different key string to be used at different times according to the key chain configuration. GLBP will query the appropriate key chain to obtain the current live key and key ID for the specified key chain.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
DETAILED STEPS
Configuring GLBP Text Authentication
This method of authentication provides minimal security. Use MD5 authentication if security is required.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
DETAILED STEPS
Configuring GLBP Weighting Values and Object Tracking
GLBP weighting is used to determine whether a router can act as a virtual forwarder. Initial weighting values can be set and optional thresholds specified. Interface states can be tracked and a decrement value set to reduce the weighting value if the interface goes down. When the GLBP router weighting drops below a specified value, the router will no longer be an active virtual forwarder. When the weighting rises above a specified value, the router can resume its role as an active virtual forwarder.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
DETAILED STEPS
Enabling and Verifying GLBP
GLBP is designed to be easy to configure. Each gateway in a GLBP group must be configured with the same group number, and at least one gateway in the GLBP group must be configured with the virtual IPv6 address to be used by the group. All other required parameters can be learned.
Prerequisites
If VLANs are in use on an interface, the GLBP group number must be different for each VLAN.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
DETAILED STEPS
Troubleshooting the GLBP
Prerequisites
This task requires a router running GLBP to be attached directly to a console.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
DETAILED STEPS
Enabling an HSRP Group for IPv6 Operation
HSRP version 2 must be enabled on an interface before HSRP IPv6 can be configured:
•
Enabling HSRP Version 2
SUMMARY STEPS
1.
2.
3.
4.
DETAILED STEPS
Enabling and Verifying an HSRP Group for IPv6 Operation
In this task, when you enter the standby ipv6 command, a modified EUI-64 format interface identifier is generated in which the EUI-64 interface identifier is created from the relevant HSRP virtual MAC address.
In IPv6, a router on the link advertises in RA messages any site-local and global prefixes, and its willingness to function as a default router for the link. RA messages are sent periodically and in response to router solicitation messages, which are sent by hosts at system startup.
A node on the link can automatically configure site-local and global IPv6 addresses by appending its interface identifier (64 bits) to the prefixes (64 bits) included in the RA messages. The resulting 128-bit IPv6 addresses configured by the node are then subjected to duplicate address detection to ensure their uniqueness on the link. If the prefixes advertised in the RA messages are globally unique, then the IPv6 addresses configured by the node are also guaranteed to be globally unique. Router solicitation messages, which have a value of 133 in the Type field of the ICMPv6 packet header, are sent by hosts at system startup so that the host can immediately autoconfigure without needing to wait for the next scheduled RA message.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
DETAILED STEPS
Configuration Examples for First Hop Redundancy Protocols in IPv6
•
•
•
•
•
•
Example: Customizing GLBP Configuration:
In the following example, Router A, shown in Figure 1, is configured with a number of GLBP commands:
interface fastethernet 0/0ipv6 address 2001:DB8:0001:0001:/64glbp 10 timers 5 18glbp 10 timers redirect 600 7200glbp 10 load-balancing host-dependentglbp 10 priority 254glbp 10 preempt delay minimum 60Example: GLBP MD5 Authentication Using Key Strings
The following example configures GLBP MD5 authentication using a key string:
!interface Ethernet 0/1ipv6 address 2001:DB8:0001:0001:/64glbp 2 authentication md5 key-string ThisStringIsTheSecretKeyglbp 2 ipv6 FE80::260:3EFF:FE11:6770Example: GLBP MD5 Authentication Using Key Chains
In the following example, GLBP queries the key chain "AuthenticateGLBP" to obtain the current live key and key ID for the specified key chain:
key chain AuthenticateGLBPkey 1key-string ThisIsASecretKeyinterface Ethernet 0/1ipv6 address 2001:DB8:0001:0001:/64glbp 2 authentication md5 key-chain AuthenticateGLBPglbp 2 ipv6 FE80::E0:F727:E400:AExample: GLBP Text Authentication
The following example configures GLBP text authentication using a text string:
interface fastethernet 0/0ipv6 address 2001:DB8:0001:0001:/64glbp 10 authentication text stringxyzglbp 10 ipv6 FE80::60:3E47:AC8:8Example: GLBP Weighting
In the following example, Router A, shown in Figure 1, is configured to track the IP routing state of the POS interfaces 5/0 and 6/0, an initial GLBP weighting with upper and lower thresholds is set, and a weighting decrement value of 10 is set. If POS interfaces 5/0 and 6/0 go down, the weighting value of the router is reduced.
track 1 interface POS 5/0 ip routingtrack 2 interface POS 6/0 ip routinginterface fastethernet 0/0glbp 10 weighting 110 lower 95 upper 105glbp 10 weighting track 1 decrement 10glbp 10 weighting track 2 decrement 10glbp 10 forwarder preempt delay minimum 60Example: Enabling GLBP Configuration
In the following example, the router is configured to enable GLBP, and the virtual IPv6 address of 2001:DB8:0002:0002:/64 is specified for GLBP group 10:
interface fastethernet 0/0ipv6 address 2001:DB8:0001:0001:/64glbp 10 ipv6 FE80::60:3E47:AC8:8In the following example, GLBP for IPv6 is enabled for GLBP group 15:
interface fastethernet 0/0ipv6 address 2001:DB8:0001:0001:/64glbp 10 ipv6Example: Enabling and Verifying an HSRP Group for IPv6 Operation
This section has the following examples:
•
•
Example: Configuration and Verification for an HSRP Group
The following example shows configuration and verification for an HSRP group for IPv6 that consists of Router1 and Router2. The show standby command is issued for each router to verify the router's configuration.
Router 1 Configuration
interface FastEthernet0/0.100description DATA VLAN for PCsencapsulation dot1Q 100ipv6 address 2001:DB8:CAFE:2100::BAD1:1010/64standby version 2standby 101 priority 120standby 101 preempt delay minimum 30standby 101 authentication esestandby 101 track Serial0/1/0.17 90standby 201 ipv6 autoconfigstandby 201 priority 120standby 201 preempt delay minimum 30standby 201 authentication esestandby 201 track Serial0/1/0.17 90Router1# show standbyFastEthernet0/0.100 - Group 101 (version 2)State is Active2 state changes, last state change 5w5dActive virtual MAC address is 0000.0c9f.f065Local virtual MAC address is 0000.0c9f.f065 (v2 default)Hello time 3 sec, hold time 10 secNext hello sent in 2.296 secsAuthentication text "ese"Preemption enabled, delay min 30 secsActive router is localPriority 120 (configured 120)Track interface Serial0/1/0.17 state Up decrement 90IP redundancy name is "hsrp-Fa0/0.100-101" (default)FastEthernet0/0.100 - Group 201 (version 2)State is Active2 state changes, last state change 5w5dVirtual IP address is FE80::5:73FF:FEA0:C9Active virtual MAC address is 0005.73a0.00c9Local virtual MAC address is 0005.73a0.00c9 (v2 IPv6 default)Hello time 3 sec, hold time 10 secNext hello sent in 2.428 secsAuthentication text "ese"Preemption enabled, delay min 30 secsActive router is localStandby router is FE80::20F:8FFF:FE37:3B70, priority 100 (expires in 7.856 sec)Priority 120 (configured 120)Track interface Serial0/1/0.17 state Up decrement 90IP redundancy name is "hsrp-Fa0/0.100-201" (default)Router 2 Configuration
interface FastEthernet0/0.100description DATA VLAN for Computersencapsulation dot1Q 100ipv6 address 2001:DB8:CAFE:2100::BAD1:1020/64standby version 2standby 101 preemptstandby 101 authentication esestandby 201 ipv6 autoconfigstandby 201 preemptstandby 201 authentication eseRouter2# show standbyFastEthernet0/0.100 - Group 101 (version 2)State is Standby7 state changes, last state change 5w5dActive virtual MAC address is 0000.0c9f.f065Local virtual MAC address is 0000.0c9f.f065 (v2 default)Hello time 3 sec, hold time 10 secNext hello sent in 0.936 secsAuthentication text "ese"Preemption enabledMAC address is 0012.7fc6.8f0cStandby router is localPriority 100 (default 100)IP redundancy name is "hsrp-Fa0/0.100-101" (default)FastEthernet0/0.100 - Group 201 (version 2)State is Standby7 state changes, last state change 5w5dVirtual IP address is FE80::5:73FF:FEA0:C9Active virtual MAC address is 0005.73a0.00c9Local virtual MAC address is 0005.73a0.00c9 (v2 IPv6 default)Hello time 3 sec, hold time 10 secNext hello sent in 0.936 secsAuthentication text "ese"Preemption enabledActive router is FE80::212:7FFF:FEC6:8F0C, priority 120 (expires in 7.548 sec)MAC address is 0012.7fc6.8f0cStandby router is localPriority 100 (default 100)IP redundancy name is "hsrp-Fa0/0.100-201" (default)Example: Configuring HSRP Global IPv6 Addresses
The following example shows three HSRP global IPv6 addresses with an explicitly configured link-local address:
interface Ethernet0/0no ip addressipv6 address 2001::DB8:1/64standby version 2standby 1 ipv6 FE80::1:CAFÉstandby 1 ipv6 2001::DB8:2/64standby 1 ipv6 2001:DB8::3/64standby 1 ipv6 2001:DB8::4/64endAdditional References
Related Documents
IPv6 link-local addresses and stateless autoconfiguration
"Implementing IPv6 Addressing and Basic Connectivity," Cisco IOS IPv6 Configuration Guide
IPv6 commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples
Configuring HSRP in IPv4
"Configuring HSRP," Cisco IOS IP Application Services Configuration Guide
Standards
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
—
MIBs
None
To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:
RFCs
Technical Assistance
Feature Information for First Hop Redundancy Protocols in IPv6
Table 1 lists the features in this module and provides links to specific configuration information.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note
Table 1 Feature Information for First Hop Redundancy Protocols for IPv6
FHRP—GLBP Support for IPv6
12.2(58)SE
12.2(33)SXI
12.4(6)TGLBP protects data traffic from a failed router or circuit while allowing packet load sharing between a group of redundant routers.
The following section provides information about this feature:
•
•
•
The following commands were introduced or modified for this feature: glbp forwarder preempt, glbp ipv6, glbp load-balancing, glbp preempt, glbp priority, glbp name, glbp timers, glbp timers redirect, glbp weighting, glbp weighting track, track interface.
GLBP MD5 Authentication
12.2(18)S
12.3(2)TMD5 authentication provides greater security than the alternative plain text authentication scheme. MD5 authentication allows each GLBP group member to use a secret key to generate a keyed MD5 hash that is part of the outgoing packet. A keyed hash of an incoming packet is generated and, if the hash within the incoming packet does not match the generated hash, the packet is ignored.
The following section provides information about this feature:
•
•
•
•
The following commands were introduced or modified for this feature: glbp authentication, key, key chain, key-string (authentication), show glbp, show key chain.
IPv6 Services—HSRP for IPv6
12.4(4)T 12.2(33)SRB
12.2(33)SXIThe HSRP is an FHRP designed to allow for transparent failover of the first-hop IPv6 router.
The following sections provide information about this feature:
•
•
The following commands were introduced or modified by this feature: show standby, standby ipv6, standby preempt, standby priority.
HSRP—Global IPv6 Addresses
12.2(33)SXI4
15.0(1)SYThe HSRP global IPv6 address feature allows users to configure multiple non-link local addresses as virtual addresses.
The following sections provide information about this feature:
•
•
The following command was modified by this feature: standby ipv6.
Glossary
•
•
•
•
•
•
•
•
•
•
Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
© 2006-2011 Cisco Systems, Inc. All rights reserved.
