Example for Associating VRRP with EFM
In this example, Virtual Router Redundancy Protocol (VRRP) is associated with Ethernet in the First Mile (EFM).
Networking Requirements
On the network shown in Figure 4-20, Device C is dual-homed to Device A and Device B. A VRRP group is deployed on both Device A and Device B to improve link reliability.
If a link fails, negotiating the VRRP status takes a certain period of time. To speed up link switchovers, enable Bidirectional Forwarding Detection (BFD) to monitor links and configure a VRRP group to monitor a BFD session. If an interface or link on the master device fails, BFD rapidly detects the fault and notifies the VRRP group. A backup device then preempts the Master state and takes over. However, this method does not apply to some networks or devices that do not support BFD. If a device does not support BFD but supports EFM, you can use EFM to implement rapid switchovers.
On the network shown in Figure 4-20, Device C does not support BFD. Therefore, EFM is used to monitor the link between a router C and Device C, and peer BFD is used to monitor the link between Device A and Device B. Associate VRRP with EFM and peer BFD to implement a rapid master/backup VRRP switchover based on the status of EFM and peer BFD sessions.
Interfaces 1 and 2 in this example represent GE 0/1/1 and GE 0/1/2, respectively.
Configuration Roadmap
The configuration roadmap is as follows:
Assign an IP address to each interface and configure a routing protocol.
Create a VRRP group on the GE interfaces of Device A and Device B, and configure Device A as the master device and Device B as the backup device.
Enable peer BFD on Device A and Device B to monitor the link between them.
Enable EFM on Device A and Device B globally and on their GE interfaces.
Associate VRRP with peer BFD on Device B.
Associate VRRP with EFM on Device A.
This example provides only the configurations for Device A and Device B.
- To associate VRRP with EFM and peer BFD, perform the following operations:
- Associate VRRP with EFM on the master device. When an EFM session enters the Discovery state, the master device's VRRP status becomes Initialize.
- Associate VRRP with peer BFD on a backup device. When a peer BFD session goes Down, the backup device increases its own VRRP priority and preempts the Master state.
Data Preparation
To complete the configuration, you need the following data:
IP address of each interface on Device A and Device B (For details, see Configuration Files in this section.)
VRRP group ID: 10; virtual IP address: 10.1.1.111; Device A's VRRP priority: 160; Device B's VRRP priority: 140; Device B's VRRP priority increased by: 40
Interval at which errored frames are checked on GE 0/1/1: 5 seconds; interval at which errored frame seconds are checked on GE 0/1/1: 120 seconds
Local and remote discriminators of a peer BFD session
Procedure
- Assign IP addresses to Device A's and Device B's interfaces and configure Open Shortest Path First (OSPF) on Device A and Device B. For Device C configuration details, see Configuration Files in this section.# Configure Device A.
<HUAWEI> system-view[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~DeviceA] interface gigabitethernet 0/1/1
[~DeviceA-GigabitEthernet0/1/1] ip address 10.1.1.1 24
[*DeviceA-GigabitEthernet0/1/1] commit
[~DeviceA-GigabitEthernet0/1/1] quit
[~DeviceA] ospf 1
[*DeviceA-ospf-1] area 0
[*DeviceA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[*DeviceA-ospf-1-area-0.0.0.0] commit
[~DeviceA-ospf-1-area-0.0.0.0] quit
[~DeviceA-ospf-1] quit
# Configure Device B.<HUAWEI> system-view[~HUAWEI] sysname DeviceB
[*HUAWEI] commit
[~DeviceB] interface gigabitethernet 0/1/1
[~DeviceB-GigabitEthernet0/1/1] ip address 10.1.1.2 24
[*DeviceB-GigabitEthernet0/1/1] commit
[~DeviceB-GigabitEthernet0/1/1] quit
[~DeviceB] ospf 1
[*DeviceA-ospf-1] area 0
[*DeviceB-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[*DeviceB-ospf-1-area-0.0.0.0] commit
[~DeviceB-ospf-1-area-0.0.0.0] quit
[~DeviceB-ospf-1] quit
- Create a VRRP group and configure basic VRRP functions.
# Create VRRP group 10 on Device A and set its VRRP priority to 160.
[~DeviceA] interface gigabitethernet 0/1/1
[~DeviceA-GigabitEthernet0/1/1] vrrp vrid 10 virtual-ip 10.1.1.111
[*DeviceA-GigabitEthernet0/1/1] vrrp vrid 10 priority 160
[*DeviceA-GigabitEthernet0/1/1] commit
[~DeviceA-GigabitEthernet0/1/1] quit
# Create VRRP group 10 on Device B and set its VRRP priority to 140.
[~DeviceB] interface gigabitethernet0/1/1
[~DeviceB-GigabitEthernet0/1/1] vrrp vrid 10 virtual-ip 10.1.1.111
[*DeviceB-GigabitEthernet0/1/1] vrrp vrid 10 priority 140
[*DeviceB-GigabitEthernet0/1/1] commit
[~DeviceB-GigabitEthernet0/1/1] quit
- Configure basic BFD functions.
# Configure Device A.
[~DeviceA] bfd
[*DeviceA-bfd] commit
[~DeviceA-bfd] quit
[~DeviceA] bfd atob bind peer-ip 10.1.1.2 interface GigabitEthernet 0/1/1
[*DeviceA-bfd-session-atob] discriminator local 1
[*DeviceA-bfd-session-atob] discriminator remote 2
[*DeviceA-bfd-session-atob] commit
[~DeviceA-bfd-session-atob] quit
# Configure Device B.
[~DeviceB] bfd
[*DeviceB-bfd] commit
[~DeviceB-bfd] quit
[*DeviceB] bfd btoa bind peer-ip 10.1.1.1 interface GigabitEthernet 0/1/1
[*DeviceB-bfd-session-btoa] discriminator local 2
[*DeviceB-bfd-session-btoa] discriminator remote 1
[*DeviceB-bfd-session-btoa] commit
[~DeviceB-bfd-session-btoa] quit
After the configuration is complete, run the display bfd session command on Device A or Device B. The command output shows that a peer BFD session has been created. The following example uses the command output on Device A.
[~DeviceA] display bfd session all
(w): State in WTR (*): State is invalid -------------------------------------------------------------------------------- Local Remote PeerIpAddr State Type InterfaceName -------------------------------------------------------------------------------- 1 2 10.1.1.2 Up S_IP_IF GigabitEthernet0/1/1 -------------------------------------------------------------------------------- Total UP/DOWN Session Number : 1/0
- Configure EFM.
# Enable EFM on Device A globally and on its GE 0/1/1, and set the intervals at which errored frames and errored frame seconds are checked on GE 0/1/1 to 5 seconds and 120 seconds, respectively.
[~DeviceA] efm enable
[*DeviceA] interface gigabitethernet 0/1/1
[*DeviceA-GigabitEthernet0/1/1] efm enable
[*DeviceA-GigabitEthernet0/1/1] efm error-frame period 5
[*DeviceA-GigabitEthernet0/1/1] efm error-frame threshold 5
[*DeviceA-GigabitEthernet0/1/1] efm error-frame notification enable
[*DeviceA-GigabitEthernet0/1/1] efm error-frame-second period 120
[*DeviceA-GigabitEthernet0/1/1] commit
[~DeviceA-GigabitEthernet0/1/1] quit
# Enable EFM on Device B globally and on its GE 0/1/1, and set the intervals at which errored frames and errored frame seconds are checked on GE 0/1/1 to 5 seconds and 120 seconds, respectively.
[~DeviceB] efm enable
[*DeviceB] interface gigabitethernet 0/1/1
[*DeviceB-GigabitEthernet0/1/1] efm enable
[*DeviceB-GigabitEthernet0/1/1] efm error-frame period 5
[*DeviceB-GigabitEthernet0/1/1] efm error-frame threshold 5
[*DeviceB-GigabitEthernet0/1/1] efm error-frame notification enable
[*DeviceB-GigabitEthernet0/1/1] efm error-frame-second period 120
[*DeviceB-GigabitEthernet0/1/1] commit
After the configuration is complete, run the display efm session all command on Device A or Device B. The command output shows that an EFM session has been created. The following example uses the command output on Device A.
[~DeviceA] display efm session all Interface EFM State Loopback Timeout ---------------------------------------------------------------------- GigabitEthernet0/1/1 detect --
- Associate VRRP with peer BFD.
# Associate VRRP with peer BFD on Device B, and configure Device B to increase its own VRRP priority by 40 if the peer BFD session goes Down.
[~DeviceB-GigabitEthernet0/1/1] vrrp vrid 10 track bfd-session 2 increased 40
[*DeviceB-GigabitEthernet0/1/1] commit
[~DeviceB-GigabitEthernet0/1/1] quit
After the configuration is complete, run the display vrrp command on Device A and Device B. The command output on Device A shows that Device A is the master device. The command output on Device B shows that Device B is the backup device and that VRRP is associated with peer BFD.
[~DeviceA] display vrrp
GigabitEthernet0/1/1 | Virtual Router 10 State : Master Virtual IP : 10.1.1.111 Master IP : 10.1.1.1 Local IP : 10.1.1.1 PriorityRun : 160 PriorityConfig : 160 MasterPriority : 160 Preempt : YES Delay Time : 0s Hold Multiplier: 4 TimerRun : 1 TimerConfig : 1 Auth Type : NONE Virtual MAC : 00e0-fc12-7890 Check TTL : YES Config Type : normal-vrrp Backup-forward : disabled Create Time : 2013-03-11 12:57:42 Last Change Time : 2013-03-11 12:57:47
[~DeviceB]display vrrp
GigabitEthernet0/1/1 | Virtual Router 10 State : Backup Virtual IP : 10.1.1.111 Master IP : 10.1.1.1 Local IP : 10.1.1.2 PriorityRun : 140 PriorityConfig : 140 MasterPriority : 160 Preempt : YES Delay Time : 0s Hold Multiplier: 4 TimerRun : 1 TimerConfig : 1 Auth Type : NONE Virtual MAC : 00e0-fc12-7890 Check TTL : YES Config Type : normal-vrrp Backup-forward : disabled Track BFD : 2 Priority increased : 40 BFD-Session State : UP Create Time : 2013-03-11 12:58:02 Last Change Time : 2013-03-11 12:58:07
- Associate VRRP with EFM.
# Associate VRRP with EFM on Device A.
[~DeviceA] interface gigabitethernet 0/1/1
[*DeviceA-GigabitEthernet0/1/1] vrrp vrid 10 track efm interface GigabitEthernet0/1/1
[*DeviceA-GigabitEthernet0/1/1] commit
[~DeviceA-GigabitEthernet0/1/1] quit
- Verify the configuration.
# Run the shutdown command on Device A's GE 0/1/1 to simulate a link fault.
[*DeviceA] interface gigabitethernet 0/1/1
[*DeviceA-GigabitEthernet0/1/1] shutdown
[*DeviceA-GigabitEthernet0/1/1] commit
[*DeviceA-GigabitEthernet0/1/1] quit
# Run the display vrrp command on Device A. The command output shows that Device A's VRRP status is Initialize.
[~DeviceA] display vrrp
GigabitEthernet0/1/1 | Virtual Router 10 State : Initialize Virtual IP : 10.1.1.111 Master IP : 0.0.0.0 Local IP : 10.1.1.1 PriorityRun : 160 PriorityConfig : 160 MasterPriority : 0 Preempt : YES Delay Time : 0s Hold Multiplier: 4 TimerRun : 1 TimerConfig : 1 Auth Type : NONE Virtual MAC : 00e0-fc12-7890 Check TTL : YES Config Type : normal-vrrp Backup-forward : disabled Track EFM : GigabitEthernet0/1/1 EFM state : DOWN Create Time : 2013-03-11 12:57:42 Last Change Time : 2013-03-11 12:57:47
# Run the display vrrp command on Device B. The command output shows that Device B's VRRP status is Master.
[~DeviceB] display vrrp
GigabitEthernet0/1/1 | Virtual Router 10 State : Master Virtual IP : 10.1.1.111 Master IP : 10.1.1.2 Local IP : 10.1.1.2 PriorityRun : 180 PriorityConfig : 140 MasterPriority : 180 Preempt : YES Delay Time : 0s Hold Multiplier: 4 TimerRun : 1 TimerConfig : 1 Auth Type : NONE Virtual MAC : 00e0-fc12-7890 Check TTL : YES Config Type : normal-vrrp Backup-forward : disabled Track BFD : 2 Priority increased : 40 BFD-Session State : Down Create Time : 2013-03-11 12:58:02 Last Change Time : 2013-03-11 12:58:07
# Run the display efm session all command on Device A. The command output shows that the status of the EFM session is discovery.
[~DeviceA] display efm session all Interface EFM State Loopback Timeout ---------------------------------------------------------------------- GigabitEthernet0/1/0 discovery --
Configuration Files
Device A configuration file
# sysname DeviceA # efm enable # bfd # interface GigabitEthernet0/1/1 undo shutdown ip address 10.1.1.1 255.255.255.0 vrrp vrid 10 virtual-ip 10.1.1.111 vrrp vrid 10 priority 160 vrrp vrid 10 track efm interface GigabitEthernet0/1/1 efm enable efm error-frame period 5 efm error-frame threshold 5 efm error-frame notification enable efm error-frame-second period 120 # bfd atob bind peer-ip 10.1.1.2 interface gigabitethernet0/1/1 discriminator local 1 discriminator remote 2 commit # ospf 1 area 0.0.0.0 network 10.1.1.0 0.0.0.255 # return
Device B configuration file
# sysname DeviceB # efm enable # bfd # interface GigabitEthernet0/1/1 undo shutdown ip address 10.1.1.2 255.255.255.0 vrrp vrid 10 virtual-ip 10.1.1.111 vrrp vrid 10 priority 140 vrrp vrid 10 track bfd-session 2 increased 40 efm enable efm error-frame period 5 efm error-frame threshold 5 efm error-frame notification enable efm error-frame-second period 120 # bfd btoa bind peer-ip 10.1.1.1 interface gigabitethernet0/1/1 discriminator local 2 discriminator remote 1 commit # ospf 1 area 0.0.0.0 network 10.1.1.0 0.0.0.255 # return
Device C configuration file
# sysname DeviceC # vlan batch 10 # efm enable # interface Vlanif10 ip address 10.1.1.3 255.255.255.0 # interface GigabitEthernet0/1/1 portswitch undo shutdown port default vlan 10 efm enable efm error-frame period 5 efm error-frame threshold 5 efm error-frame notification enable efm error-frame-second period 120 # interface GigabitEthernet0/1/2 portswitch undo shutdown port default vlan 10 efm enable efm error-frame period 5 efm error-frame threshold 5 efm error-frame notification enable efm error-frame-second period 120 # return
