BFD
1.BFD Introduction 2. Static routing calls BFD 3.OSPF call call BFD BFD 4.VRRP
BFD: Bidirectional Forwarding Detection Bidirectional Forwarding check
Action: troubleshooting millisecond, usually in combination Layer protocols (e.g., static routing, VRRP, OSPF, BGP, etc.) to achieve a quick check of a link failure.
FIG 1: R1 R2 a route to 2.2.2.2 There are two lines, high above the link bandwidth, the routing take the above route,
However, when one side of a fault line R2, then R1 can not be timely sensing line failure, so a BFD quick check can be completed within the switching circuit milliseconds.
1. Check the static BFD
# R1 configuration
[Huawei]sysnam R1
[R1]inteface Ethernet0/0/1
[R1-Ethernet0/0/1]ip address 21.1.1.10 255.255.255.0
[R1-Ethernet0/0/1]quit
[R1]interface Ethernet0/0/0
[R1-Ethernet0/0/0]ip address 12.1.1.10 255.255.255.0
[R1-Ethernet0/0/0]quit
[R1]interface loopback 0
[R1-loopback0]ip address 1.1.1.1 32
[R1-loopback0]quit
[R1]bfd
[R1-bfd]quit
[R1]bfd 1 bind peer-ip 12.1.1.11 source-ip 12.1.1.10
[R1-bfd-session-1]discriminator local 2
[R1-bfd-session-1]discriminator remot 1
[R1-bfd-session-1]commit
[R1-bfd-session-1]quit
[R1]
[R1]ip route-static 2.2.2.2 32 21.1.1.11
[R1]ip route-static 2.2.2.2 32 12.1.1.11 pre 55 track bfd-session 1
# R2 configuration
[Huawei]sysnam R2
[R2] inteface Ethernet0 / 0/1 // enter the interface
[R2-Ethernet0 / 0/1] ip address 21.1.1.11 255.255.255.0 // Configure IP addresses
[R2-Ethernet0/0/1]quit
[R2]interface Ethernet0/0/0
[R2-Ethernet0/0/0]ip address 12.1.1.11 255.255.255.0
[R2-Ethernet0/0/0]quit
[R2]interface loopback 0
[R2-loopback0]ip address 2.2.2.2 32
[R2-loopback0]quit
[R2] bfd // enable BFD globally
[R2-bfd]quit
[R2] bfd 1 bind peer-ip 12.1.1.1 0 source-ip 12.1.1.11. // Create a BFD process 1
[R2-bfd-session-1] discriminator local 1 // local ID, identification needs two routers symmetric to each other
[R2-bfd-session-1] discriminator remot 2 // distal end is
[R2-bfd-session-1] commit // submitted BFD Configuration
[R2-bfd-session-1]quit
[R2]ip route-static 1.1.1.1 32 21.1.1.10
[R2] ip route-static 1.1.1.1 32 12.1.1.10 pre 55 track bfd-session 1 // static call routing at BFD
[R2]
# R10 view the configuration of BFD
<R10>display bfd session static
Local Remote PeerIpAddr State Type InterfaceName
1 2 12.1.1.11 Up S_IP_PEER -Total UP/DOWN Session Number : 1/0
<R10>
View detailed configuration of BFD on # R10
<R10>display bfd session static verbose
Session MIndex : 256 (Multi Hop) State : Up Name : 1
Local Discriminator : 1 Remote Discriminator : 2
Session Detect Mode : Asynchronous Mode Without Echo Function
BFD Bind Type : Peer IP Address
Bind Session Type : Static
Bind Peer IP Address : 12.1.1.11
Bind Interface : -
Track Interface : -
Bind Source IP Address : 12.1.1.10
FSM Board Id : 0 TOS-EXP : 7
Min Tx Interval (ms) : 1000 Min Rx Interval (ms) : 1000
Actual Tx Interval (ms): 1000 Actual Rx Interval (ms): 1000
Local Detect Multi : 3 Detect Interval (ms) : 3000
Echo Passive : Disable Acl Number : -
Destination Port : 3784 TTL : 254
Proc Interface Status : Disable Process PST : Disable
WTR Interval (ms) : -
Active Multi : 3
Last Local Diagnostic : No Diagnostic
Bind Application : No Application Bind
Session TX TmrID : - Session Detect TmrID : -
Session Init TmrID : - Session WTR TmrID : -
Session Echo Tx TmrID : -
PDT Index : FSM-0 | RCV-0 | IF-0 | TOKEN-0
Session Description : -
Total UP/DOWN Session Number : 1/0
<R10>
2. Dynamic BFD: OSPF BFD call to accelerate the convergence
# R1 configuration
[R1]interface Ethernet0/0/0
[R1-Ethernet0/0/0]ip address 12.1.1.1 24
[R1-Ethernet0/0/0]quit
[R1]interface Loopback0
[R1-loopback0]ip address 1.1.1.1 255.255.255.255
[R1-loopback0]quit
[R1] router id 1.1.1.1 // router Router-ID
[R1] ospf 10 // open the OSPF process 10
[R1-ospf-10] area 0 // The OSPF area 10 0
[R1-ospf-10-0.0.0.0] network 12.1.1.0 0.0.0.255 / / route announcement at the region 0 OSPF10
[R1-ospf-10-0.0.0.0]network 1.1.1.1 0.0.0.0
[R1-ospf-10-0.0.0.0]quit
[R1-ospf-10]quit
[R1] bfd // Enable global BFD check
[R1-bfd]quit
[R1] ospf 10 // The OSPF process 10
[R1-ospf-10] bfd all-interfaces enable // open at BFD for OSPF
[R1-ospf-10]quit
[R1]
# R2 configuration
[R2]interface Ethernet0/0/0
[R2-Ethernet0/0/0]ip address 12.1.1.1 24
[R2-Ethernet0/0/0]quit
[R2] interface Loopback0 // back into the ring opening
[R2-loopback0] ip address 1.1.1.1 255.255.255.255 // port loopback address configure
[R2-loopback0]quit
[R2]router id 1.1.1.1
[R2]ospf 10
[R2-ospf-10]area 0
[R2-ospf-10-0.0.0.0]network 12.1.1.0 0.0.0.255
[R2-ospf-10-0.0.0.0]network 1.1.1.1 0.0.0.0
[R2-ospf-10-0.0.0.0]quit
[R2-ospf-10]quit
[R2] bfd // check the global enable BFD
[R2-bfd]quit
[R2] ospf 10 // 10 into the process of OSPF
[R2-ospf-10]bfd all-interfaces enable
[R2-ospf-10]quit
[R2]
# R10 under dynamic display of BFD neighbor
<R10>display bfd session dynamic
Local Remote PeerIpAddr State Type InterfaceName
8192 8192 21.1.1.11 Up D_IP_IF GigabitEthernet0/0/0
8193 8193 12.1.1.11 Up D_IP_IF GigabitEthernet0/0/1
Total UP/DOWN Session Number : 2/0
<R10>
For more information on the configuration of BFD # R10
<R10>display bfd session all verbose
Session MIndex : 257 (One Hop) State : Up Name : dyn_8192
Local Discriminator : 8192 Remote Discriminator : 8192
Session Detect Mode : Asynchronous Mode Without Echo Function
BFD Bind Type : Interface(GigabitEthernet0/0/0)
Bind Session Type : Dynamic
Bind Peer IP Address : 21.1.1.11
NextHop Ip Address : 21.1.1.11
Bind Interface : GigabitEthernet0/0/0
FSM Board Id : 0 TOS-EXP : 7
Min Tx Interval (ms) : 1000 Min Rx Interval (ms) : 1000
Actual Tx Interval (ms): 1000 Actual Rx Interval (ms): 1000
Local Detect Multi : 3 Detect Interval (ms) : 3000
Echo Passive : Disable Acl Number : -
Destination Port : 3784 TTL : 255
Proc Interface Status : Disable Process PST : Disable
WTR Interval (ms) : -
Active Multi : 3
Last Local Diagnostic : No Diagnostic
Bind Application : OSPF
Session TX TmrID : - Session Detect TmrID : -
Session Init TmrID : - Session WTR TmrID : -
Session Echo Tx TmrID : -
PDT Index : FSM-0 | RCV-0 | IF-0 | TOKEN-0
Session Description : -
Session MIndex : 258 (One Hop) State : Up Name : dyn_8193
Local Discriminator : 8193 Remote Discriminator : 8193
Session Detect Mode : Asynchronous Mode Without Echo Function
BFD Bind Type : Interface(GigabitEthernet0/0/1)
Bind Session Type : Dynamic
Bind Peer IP Address : 12.1.1.11
NextHop Ip Address : 12.1.1.11
Bind Interface : GigabitEthernet0/0/1
FSM Board Id : 0 TOS-EXP : 7
Min Tx Interval (ms) : 1000 Min Rx Interval (ms) : 1000
Actual Tx Interval (ms): 1000 Actual Rx Interval (ms): 1000
Local Detect Multi : 3 Detect Interval (ms) : 3000
Echo Passive : Disable Acl Number : -
Destination Port : 3784 TTL : 255
Proc Interface Status : Disable Process PST : Disable
WTR Interval (ms) : -
Active Multi : 3
Last Local Diagnostic : No Diagnostic
Bind Application : OSPF
Session TX TmrID : - Session Detect TmrID : -
Session Init TmrID : - Session WTR TmrID : -
Session Echo Tx TmrID : -
PDT Index : FSM-1 | RCV-0 | IF-0 | TOKEN-0
Session Description : -
Total UP/DOWN Session Number : 2/0
<R10>
3.VRRP linkage BFD
Topology topology
Specifically located:
# R10 Configuration
[R10] interface GigabitEthernet0 / 0/0 // enter the interface GigabitEthernet0 / 0/0
[R10-GigabitEthernet0 / 0/0] ip address 21.1.1.10 255.255.255.0 // Configure IP addresses
[R10-GigabitEthernet0 / 0/0] quit // Exit Interface
[R10]bfd
[R10-bfd]quit
[R10] bfd 5 bind peer-ip 112.1.1.12 source-ip 112.1.1.10 // configure static BFD-5
[R10-bfd-session-5] discriminator local 100 // 100 configure the local values
[R10-bfd-session-5] discriminator remote 200 // 200 disposed distal values
[R10-bfd-session-5] commit // submitted BFD Configuration
[R10-bfd-session-5]quit
[R10]bfd bb bind peer-ip 112.1.1.12 source-ip 112.1.1.10 auto
[R10-bfd-session-bb]quit
[R10]
[R10]interface GigabitEthernet0/0/1
[R10-GigabitEthernet0/0/1]ip address 12.1.1.10 255.255.255.0
[R10-GigabitEthernet0/0/1]vrrp vrid 10 virtual-ip 12.1.1.1
[R10-GigabitEthernet0/0/1]vrrp vrid 10 priority 105
[R10-GigabitEthernet0 / 0/1] vrrp vrid 10 track bfd-session 100 // VRRP BFD100 local call identifier of the BFD
[R10-GigabitEthernet0/0/1]quit
[R10]interface loopback 0
[R10-loopback0]ip address 10.10.10.10 255.255.255.25
[R10-loopback0]quit
[R10]
# R11 configuration
[R11]interface GigabitEthernet0/0/0
[R11-GigabitEthernet0/0/0]ip address 21.1.1.11 255.255.255.0
[R11-GigabitEthernet0/0/0]quit
[R11]interface GigabitEthernet0/0/1
[R11-GigabitEthernet0/0/1]ip address 12.1.1.11 255.255.255.0
[R11-GigabitEthernet0/0/1]vrrp vrid 10 virtual-ip 12.1.1.1
[R11-GigabitEthernet0/0/1]quit
[R11]interface loopback 0
[R11-loopback0]ip address 11.11.11.11 255.255.255.25
[R11-loopback0]quit
[R11]
# R12 configuration
[R12]interface GigabitEthernet0/0/0
[R12-GigabitEthernet0/0/0]ip address 112.1.1.12 255.255.255.0
[R12-GigabitEthernet0/0/0]quit
[R12]
[R12]bfd 5 bind peer-ip 112.1.1.12 source-ip 112.1.1.10
[R12-bfd-session-5] discriminator local 200 // Local identifier configured BFD
[R12-bfd-session-5] discriminator remote 100 // remote configuration identification BFD
[R12-bfd-session-5] commit // configuration submitted BFD
[R12-bfd-session-5]quit
[R12] bfd bb bind peer-ip 112.1.1.10 source-ip 112.1.1.12 auto // automatic detection mechanism configured BFD
[R12]interface loopback 0
[R12-loopback0]ip address 12.12.12.12 255.255.255.255
[R12-loopback0]quit
[R12]
View BFD session on R10
[R10]display bfd session all
Local Remote PeerIpAddr State Type InterfaceName
8192 8192 21.1.1.11 Up D_IP_IF GigabitEthernet0/0/0
8193 8193 12.1.1.11 Up D_IP_IF GigabitEthernet0/0/1
100 200 112.1.1.12 Up S_IP_PEER -
Total UP/DOWN Session Number : 3/0
[R10]
View VRRP Configuration (VRRP priorities change after a broken link) on # R10
<R10>display vrrp
GigabitEthernet0/0/1 | Virtual Router 10
State : Backup
Virtual IP : 12.1.1.1 Master IP : 12.1.1.11
PriorityRun : 95 PriorityConfig : 105
MasterPriority : 100 Preempt : YES Delay Time : 0 s
TimerRun : 1 s TimerConfig : 1 s
Auth type : NONE Virtual MAC : 0000-5e00-010a
Check TTL : YES Config type : normal-vrrp
Backup-forward : disable Track BFD : bb Priority reduced : 10
BFD-session state : DOWN Create time : 2020-03-29 14:35:24 UTC-08:00
Last change time : 2020-03-29 15:29:32 UTC-08:00
<R10>
# R10 after the peer link reply priority
<R10>display vrrp
GigabitEthernet0/0/1 | Virtual Router 10
State : Master
Virtual IP : 12.1.1.1 Master IP : 12.1.1.10
PriorityRun : 105 PriorityConfig : 105
MasterPriority : 105 Preempt : YES Delay Time : 0 s
TimerRun : 1 s TimerConfig : 1 s
Auth type : NONE Virtual MAC : 0000-5e00-010a
Check TTL : YES Config type : normal-vrrp
Backup-forward : disable Track BFD : bb Priority reduced : 10
BFD-session state : UP Create time : 2020-03-29 14:35:24 UTC-08:00
Last change time : 2020-03-29 15:37:00 UTC-08:00
<R10>
Note: VRRP BFD Linkage: If the associated VRRP typically have layer two device isolation, can now be achieved by means of BFD failure detection.