1. VRRP Interface Track 동작 과정

1) 구성도 및 Configuration

더보기 
< R1 : 설정 >
set bridge-domains VLAN10 vlan-id 10
set bridge-domains VLAN10 routing-interface irb.10
set interfaces ge-0/0/1 unit 0 family bridge interface-mode trunk
set interfaces ge-0/0/1 unit 0 family bridge vlan-id-list 10
set interfaces irb unit 10 family inet address 10.0.0.2/24 vrrp-group 10 virtual-address 10.0.0.1
set interfaces irb unit 10 family inet address 10.0.0.2/24 vrrp-group 10 priority 120
set interfaces irb unit 10 family inet address 10.0.0.2/24 vrrp-group 10 accept-data
더보기 
< R2 : 설정 >
set bridge-domains VLAN10 vlan-id 10
set bridge-domains VLAN10 routing-interface irb.10
set interfaces ge-0/0/1 unit 0 family bridge interface-mode trunk
set interfaces ge-0/0/1 unit 0 family bridge vlan-id-list 10
set interfaces irb unit 10 family inet address 10.0.0.3/24 vrrp-group 10 virtual-address 10.0.0.1
set interfaces irb unit 10 family inet address 10.0.0.3/24 vrrp-group 10 accept-data
더보기 
< SW : 설정 >
set bridge-domains VLAN10 vlan-id 10
set interfaces ge-0/0/0 unit 0 family bridge interface-mode trunk
set interfaces ge-0/0/0 unit 0 family bridge vlan-id-list 10
set interfaces ge-0/0/1 unit 0 family bridge interface-mode trunk
set interfaces ge-0/0/1 unit 0 family bridge vlan-id-list 10
set interfaces ge-0/0/2 unit 0 family bridge interface-mode access
set interfaces ge-0/0/2 unit 0 family bridge vlan-id 10
  • Juniper Default Priority : 100 
  • Juniper Default Preempt : Enable
  • IGP는 OSPF로 구성하였으며 OSPF Interface-Type은 Broadcast로 설정

 

2) VRRP Interface Track 필요성

  • VRRP 동작 과정 및 VRRP Preempt 동작 과정은 이미 알고 있다는 가정하에 설명 시작

  • Master 장비는 Advertisement Interval마다 VRRP Advertisement를 전송하여 자신이 생존했음을 통보

 

  • R1 Uplink가 Down되어도 R1은 Master 상태를 유지
  • PC1은 외부로 데이터 전송 시, 게이트웨이인 V-MAC을 가지고 있는 Master인 R1까지 전송되지만 R1은 OSPF Neighbor가 끊어졌으므로 라우팅 테이블에 D-IP에 대한 정보가 없으므로 전송 불가

 

root@R1> show vrrp 
Interface     State       Group   VR state VR Mode   Timer    Type   Address
irb.10        up             10   master   Active      A  0.363 lcl    10.0.0.2       
                                                                vip    10.0.0.1
root@R1> show route table inet.0 1.1.1.1 

root@R1>
  • R1은 VRRP Master로 동작하면서 라우팅 테이블에 1.1.1.1/32 네트워크가 없는 상태

 

< PC1 Ping Test >
VPCS> ping 1.1.1.1

*10.0.0.2 icmp_seq=1 ttl=255 time=5.186 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=2 ttl=255 time=5.563 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=3 ttl=255 time=4.121 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=4 ttl=255 time=4.230 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=5 ttl=255 time=4.621 ms (ICMP type:3, code:0, Destination network unreachable)

 

3) VRRP Interface Track 동작 과정

(1) VRRP Interfae Track Configuration

< R1 : VRRP Interface Track 설정 >
set interfaces irb unit 10 family inet address 10.0.0.2/24 vrrp-group 10 track interface ge-0/0/0 priority-cost 70
	## ge-0/0/0 Down 시, Priority 70 감소
set interfaces irb unit 10 family inet address 10.0.0.2/24 vrrp-group 10 track priority-hold-time 45
	## 45초 동안 대기 후, Priority 변경

 

(2) R1 Uplink Failure

  • R1 ge-0/0/0이 Down되어도 위에서 설정한 'priority-hold-time' 시간 동안 R1은 VRRP Priority 값을 변경하지 않고 동작

 

root@R1> show vrrp 
Interface     State       Group   VR state VR Mode   Timer    Type   Address
irb.10        up             10   master   Active      A  0.049 lcl    10.0.0.2       
                                                                vip    10.0.0.1
root@R1> show vrrp detail 
Physical interface: irb, Unit: 10, Address: 10.0.0.2/24
  Index: 328, SNMP ifIndex: 537, VRRP-Traps: disabled, VRRP-Version: 2
  Interface state: up, Group: 10, State: master, VRRP Mode: Active
  Priority: 120, Advertisement interval: 1, Authentication type: none
  Advertisement threshold: 3, Computed send rate: 0
  Preempt: yes, Accept-data mode: yes, VIP count: 1, VIP: 10.0.0.1           
  Advertisement Timer: 0.661s, Master router: 10.0.0.2
  Virtual router uptime: 01:11:25, Master router uptime: 00:01:45
  Virtual Mac: 00:00:5e:00:01:0a
  Preferred: yes 
  Tracking: enabled 
    Current priority: 120, Configured priority: 120 
    Priority hold time: 45, Remaining: 23.512, Pending priority: 50
    Interface tracking: enabled, Interface count: 1  
      Interface     Int state   Int speed   Incurred priority cost
      ge-0/0/0.0    down                0                      70
    Route tracking: disabled
  • Interface Track이 Enable되었고 ge-0/0/0이 Down된 것을 인지하였지만 'priority-hold-time' 동안 Priority 값을 변경하지 않고 유지하여 Master로 계속 동작

 

root@R1> show route table inet.0 1.1.1.1 

root@R1>
더보기 
< PC1 : Ping Test >
VPCS> ping 1.1.1.1 -c 1000 

84 bytes from 1.1.1.1 icmp_seq=1 ttl=63 time=5.419 ms
84 bytes from 1.1.1.1 icmp_seq=2 ttl=63 time=5.158 ms
1.1.1.1 icmp_seq=3 timeout
*10.0.0.2 icmp_seq=4 ttl=255 time=168.705 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=5 ttl=255 time=4.839 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=6 ttl=255 time=4.290 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=7 ttl=255 time=2.297 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=8 ttl=255 time=3.415 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=9 ttl=255 time=251.641 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=10 ttl=255 time=251.641 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=11 ttl=255 time=3.926 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=12 ttl=255 time=4.505 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=13 ttl=255 time=12.710 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=14 ttl=255 time=4.666 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=15 ttl=255 time=3.635 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=16 ttl=255 time=468.944 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=17 ttl=255 time=612.598 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=18 ttl=255 time=7.709 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=19 ttl=255 time=3.981 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=20 ttl=255 time=58.185 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=21 ttl=255 time=2.554 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=22 ttl=255 time=438.520 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=23 ttl=255 time=799.573 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=24 ttl=255 time=3.617 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=25 ttl=255 time=4.219 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=26 ttl=255 time=22.957 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=27 ttl=255 time=5.122 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=28 ttl=255 time=3.649 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=29 ttl=255 time=134.299 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=30 ttl=255 time=560.624 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=31 ttl=255 time=3.083 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=32 ttl=255 time=4.657 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=33 ttl=255 time=4.012 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=34 ttl=255 time=2.788 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=35 ttl=255 time=221.572 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=36 ttl=255 time=221.572 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=37 ttl=255 time=3.336 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=38 ttl=255 time=2.854 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=39 ttl=255 time=4.598 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=40 ttl=255 time=3.615 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=41 ttl=255 time=4.095 ms (ICMP type:3, code:0, Destination network unreachable)
*10.0.0.2 icmp_seq=42 ttl=255 time=4.095 ms (ICMP type:3, code:0, Destination network unreachable)
84 bytes from 1.1.1.1 icmp_seq=43 ttl=63 time=5.684 ms
84 bytes from 1.1.1.1 icmp_seq=44 ttl=63 time=5.643 ms
84 bytes from 1.1.1.1 icmp_seq=45 ttl=63 time=5.790 ms
84 bytes from 1.1.1.1 icmp_seq=46 ttl=63 time=5.787 ms
84 bytes from 1.1.1.1 icmp_seq=47 ttl=63 time=4.122 ms
84 bytes from 1.1.1.1 icmp_seq=48 ttl=63 time=4.997 ms
84 bytes from 1.1.1.1 icmp_seq=49 ttl=63 time=4.599 ms
84 bytes from 1.1.1.1 icmp_seq=50 ttl=63 time=4.627 ms
  • VRRP Priority 값을 변경하지 않으므로 PC1은 외부로 데이터 전송 시, 게이트웨이인 V-MAC을 가지고 있는 Master인 R1까지 전송되지만 R1은 OSPF Neighbor가 끊어져 라우팅 테이블에 D-IP에 대한 정보가 없으므로 PC1은 1.1.1.1과 통신 불가
  • 위 Ping Test는 R1 Uplink Down 시, Convergence될 때까지 진행한 결과로, R2가 Backup→Master로 변경될 때까지 통신 불가

 

  • R1은 'priority-hold-time' 후에 Priority를 감소하였지만 아직 Master로 동작

 

root@R1> show vrrp detail    
Physical interface: irb, Unit: 10, Address: 10.0.0.2/24
  Index: 328, SNMP ifIndex: 537, VRRP-Traps: disabled, VRRP-Version: 2
  Interface state: up, Group: 10, State: master, VRRP Mode: Active
  Priority: 50, Advertisement interval: 1, Authentication type: none
  Advertisement threshold: 3, Computed send rate: 0
  Preempt: yes, Accept-data mode: yes, VIP count: 1, VIP: 10.0.0.1           
  Advertisement Timer: 0.335s, Master router: 10.0.0.2
  Virtual router uptime: 01:51:43, Master router uptime: 00:00:49
  Virtual Mac: 00:00:5e:00:01:0a
  Preferred: yes 
  Tracking: enabled 
    Current priority: 50, Configured priority: 120 
    Priority hold time: 45, Not running 
    Interface tracking: enabled, Interface count: 1  
      Interface     Int state   Int speed   Incurred priority cost
      ge-0/0/0.0    down                0                      70
    Route tracking: disabled

 

(3) Master Device Change

  • R2는 본인보다 Priority가 낮은 VRRP Advertisement를 수신하고 Preempt 옵션이 동작하여 Master로 변경
  • PC1은 외부로 데이터 전송 시, 게이트웨이인 V-MAC을 가지고 있는 Master 장비인 R2로 전송되고 R2는 라우팅 테이블에 D-IP에 대한 정보가 있으므로 통신 가능

 

root@R1> show vrrp 
Interface     State       Group   VR state VR Mode   Timer    Type   Address
irb.10        up             10   backup   Active      D  2.857 lcl    10.0.0.2       
                                                                vip    10.0.0.1       
                                                                mas    10.0.0.3
root@R2> show vrrp 
Interface     State       Group   VR state VR Mode   Timer    Type   Address
irb.10        up             10   master   Active      A  0.044 lcl    10.0.0.3       
                                                                vip    10.0.0.1
root@R1> show vrrp detail 
Physical interface: irb, Unit: 10, Address: 10.0.0.2/24
  Index: 328, SNMP ifIndex: 537, VRRP-Traps: disabled, VRRP-Version: 2
  Interface state: up, Group: 10, State: backup, VRRP Mode: Active
  Priority: 50, Advertisement interval: 1, Authentication type: none
  Advertisement threshold: 3, Computed send rate: 0
  Preempt: yes, Accept-data mode: yes, VIP count: 1, VIP: 10.0.0.1           
  Dead timer: 2.451s, Master priority: 100, Master router: 10.0.0.3 
  Virtual router uptime: 01:13:20
  Preferred: yes 
  Tracking: enabled 
    Current priority: 50, Configured priority: 120 
    Priority hold time: 45, Not running 
    Interface tracking: enabled, Interface count: 1  
      Interface     Int state   Int speed   Incurred priority cost
      ge-0/0/0.0    down                0                      70
    Route tracking: disabled
  • Interface Track이 동작하여 Priority를 50으로 감소하였으며 Backup으로 동작 중이었던 R2는 Master로 동작

 

Oct  4 08:54:31  R1 mib2d[5931]: SNMP_TRAP_LINK_DOWN: ifIndex 526, ifAdminStatus down(2), ifOperStatus down(2), ifName ge-0/0/0
Oct  4 08:55:16  R1 vrrpd[16092]: VRRPD_NEW_BACKUP: Interface irb.10 (local address 10.0.0.2) became VRRP backup for group 10
  • R1은 로그 확인 결과 설정한 'priority-hold-time'과 비슷한 45s 후에 Master→Backup으로 변경

 

(4) R1 Uplink Recovery

  • R1 ge-0/0/0이 Up되어도 위에서 설정한 'Priority-hold-time' 시간 동안 R1은 VRRP Priority 값을 변경하지 않고 동작

 

root@R1> show vrrp 
Interface     State       Group   VR state VR Mode   Timer    Type   Address
irb.10        up             10   backup   Active      D  3.353 lcl    10.0.0.2       
                                                                vip    10.0.0.1       
                                                                mas    10.0.0.3
root@R2> show vrrp 
Interface     State       Group   VR state VR Mode   Timer    Type   Address
irb.10        up             10   master   Active      A  0.062 lcl    10.0.0.3       
                                                                vip    10.0.0.1
root@R1> show vrrp detail 
Physical interface: irb, Unit: 10, Address: 10.0.0.2/24
  Index: 328, SNMP ifIndex: 537, VRRP-Traps: disabled, VRRP-Version: 2
  Interface state: up, Group: 10, State: backup, VRRP Mode: Active
  Priority: 50, Advertisement interval: 1, Authentication type: none
  Advertisement threshold: 3, Computed send rate: 0
  Preempt: yes, Accept-data mode: yes, VIP count: 1, VIP: 10.0.0.1           
  Dead timer: 2.513s, Master priority: 100, Master router: 10.0.0.3 
  Virtual router uptime: 01:17:53
  Preferred: yes 
  Tracking: enabled 
    Current priority: 50, Configured priority: 120 
    Priority hold time: 45, Remaining: 34.048, Pending priority: 120
    Interface tracking: enabled, Interface count: 1  
      Interface     Int state   Int speed   Incurred priority cost
      ge-0/0/0.0    up                 1g                       0
    Route tracking: disabled
  • Interface Track이 Enable되었고 ge-0/0/0이 Up된 것을 인지하였지만 'priority-hole-time'동안 Priority 값을 변경하지 않고 유지하여 Backup으로 계속 동작

 

root@R2> show route table inet.0 1.1.1.1 

inet.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

1.1.1.1/32         *[OSPF/10] 14:02:51, metric 100
                    > to 1.1.3.1 via ge-0/0/0.0
더보기 
< PC1 : Ping Test >
VPCS> ping 1.1.1.1 -c 1000

84 bytes from 1.1.1.1 icmp_seq=1 ttl=63 time=5.757 ms
84 bytes from 1.1.1.1 icmp_seq=2 ttl=63 time=5.199 ms
84 bytes from 1.1.1.1 icmp_seq=3 ttl=63 time=6.005 ms
84 bytes from 1.1.1.1 icmp_seq=4 ttl=63 time=5.261 ms
84 bytes from 1.1.1.1 icmp_seq=5 ttl=63 time=5.689 ms
84 bytes from 1.1.1.1 icmp_seq=6 ttl=63 time=5.340 ms
84 bytes from 1.1.1.1 icmp_seq=7 ttl=63 time=5.055 ms
84 bytes from 1.1.1.1 icmp_seq=8 ttl=63 time=4.720 ms
84 bytes from 1.1.1.1 icmp_seq=9 ttl=63 time=5.657 ms
84 bytes from 1.1.1.1 icmp_seq=10 ttl=63 time=5.892 ms
84 bytes from 1.1.1.1 icmp_seq=11 ttl=63 time=4.176 ms
84 bytes from 1.1.1.1 icmp_seq=12 ttl=63 time=4.653 ms
84 bytes from 1.1.1.1 icmp_seq=13 ttl=63 time=5.483 ms
84 bytes from 1.1.1.1 icmp_seq=14 ttl=63 time=5.320 ms
84 bytes from 1.1.1.1 icmp_seq=15 ttl=63 time=4.310 ms
84 bytes from 1.1.1.1 icmp_seq=16 ttl=63 time=4.382 ms
84 bytes from 1.1.1.1 icmp_seq=17 ttl=63 time=4.674 ms
84 bytes from 1.1.1.1 icmp_seq=18 ttl=63 time=5.813 ms
84 bytes from 1.1.1.1 icmp_seq=19 ttl=63 time=6.623 ms
84 bytes from 1.1.1.1 icmp_seq=20 ttl=63 time=4.602 ms
84 bytes from 1.1.1.1 icmp_seq=21 ttl=63 time=5.067 ms
84 bytes from 1.1.1.1 icmp_seq=22 ttl=63 time=5.184 ms
84 bytes from 1.1.1.1 icmp_seq=23 ttl=63 time=4.456 ms
84 bytes from 1.1.1.1 icmp_seq=24 ttl=63 time=4.737 ms
84 bytes from 1.1.1.1 icmp_seq=25 ttl=63 time=5.797 ms
84 bytes from 1.1.1.1 icmp_seq=26 ttl=63 time=6.725 ms
84 bytes from 1.1.1.1 icmp_seq=27 ttl=63 time=5.130 ms
84 bytes from 1.1.1.1 icmp_seq=28 ttl=63 time=5.843 ms
84 bytes from 1.1.1.1 icmp_seq=29 ttl=63 time=3.634 ms
84 bytes from 1.1.1.1 icmp_seq=30 ttl=63 time=5.463 ms
84 bytes from 1.1.1.1 icmp_seq=31 ttl=63 time=3.953 ms
84 bytes from 1.1.1.1 icmp_seq=32 ttl=63 time=4.682 ms
84 bytes from 1.1.1.1 icmp_seq=33 ttl=63 time=5.733 ms
84 bytes from 1.1.1.1 icmp_seq=34 ttl=63 time=6.185 ms
84 bytes from 1.1.1.1 icmp_seq=35 ttl=63 time=4.959 ms
84 bytes from 1.1.1.1 icmp_seq=36 ttl=63 time=5.640 ms
84 bytes from 1.1.1.1 icmp_seq=37 ttl=63 time=4.677 ms
84 bytes from 1.1.1.1 icmp_seq=38 ttl=63 time=4.680 ms
84 bytes from 1.1.1.1 icmp_seq=39 ttl=63 time=5.099 ms
84 bytes from 1.1.1.1 icmp_seq=40 ttl=63 time=5.145 ms
84 bytes from 1.1.1.1 icmp_seq=41 ttl=63 time=6.402 ms
84 bytes from 1.1.1.1 icmp_seq=42 ttl=63 time=6.663 ms
84 bytes from 1.1.1.1 icmp_seq=43 ttl=63 time=5.076 ms
84 bytes from 1.1.1.1 icmp_seq=44 ttl=63 time=4.362 ms
84 bytes from 1.1.1.1 icmp_seq=45 ttl=63 time=4.639 ms
84 bytes from 1.1.1.1 icmp_seq=46 ttl=63 time=4.590 ms
84 bytes from 1.1.1.1 icmp_seq=47 ttl=63 time=6.674 ms
84 bytes from 1.1.1.1 icmp_seq=48 ttl=63 time=5.184 ms
84 bytes from 1.1.1.1 icmp_seq=49 ttl=63 time=6.193 ms
84 bytes from 1.1.1.1 icmp_seq=50 ttl=63 time=5.629 ms
  • R2 라우팅 테이블에 D-IP인 1.1.1.1/32에 대한 네트워크 정보가 있으므로 PC1은 1.1.1.1과 통신 가능
  • 위 Ping Test는 R1 Uplink Recovery 시, Convergence될 때까지 진행한 결과로, 'priority-hold-time' 동안 R2가 Master로 동작하므로 R1이 Backup→Master로 변경되어도 문제없이 통신 가능

 

  • R1은 'priority-hold-time' 후에 Priority를 120으로 원복하였지만 아직 Backup으로 동작

 

root@R1> show vrrp detail    
Physical interface: irb, Unit: 10, Address: 10.0.0.2/24
  Index: 328, SNMP ifIndex: 537, VRRP-Traps: disabled, VRRP-Version: 2
  Interface state: up, Group: 10, State: backup, VRRP Mode: Active
  Priority: 120, Advertisement interval: 1, Authentication type: none
  Advertisement threshold: 3, Computed send rate: 0
  Preempt: yes, Accept-data mode: yes, VIP count: 1, VIP: 10.0.0.1           
  Dead timer: 0.000s, Master priority: 100, Master router: 10.0.0.3 
  Virtual router uptime: 12:02:39
  Preferred: yes 
  Tracking: enabled 
    Current priority: 120, Configured priority: 120 
    Priority hold time: 45, Not running 
    Interface tracking: enabled, Interface count: 1  
      Interface     Int state   Int speed   Incurred priority cost
      ge-0/0/0.0    up                 1g                       0
    Route tracking: disabled

 

(5) Master Device Change

  • R1은 본인보다 Priority가 낮은 VRRP Advertisement를 수신하고 Preempt 옵션이 동작하여 Master로 변경
  • PC1은 외부로 데이터 전송 시, 게이트웨이인 V-MAC을 가지고 있는 Master 장비인 R1로 전송되고 R1은 라우팅 테이블에 D-IP에 대한 정보가 있으므로 통신 가능

 

root@R1> show vrrp 
Interface     State       Group   VR state VR Mode   Timer    Type   Address
irb.10        up             10   master   Active      A  0.201 lcl    10.0.0.2       
                                                                vip    10.0.0.1
root@R1> show vrrp detail 
Physical interface: irb, Unit: 10, Address: 10.0.0.2/24
  Index: 328, SNMP ifIndex: 537, VRRP-Traps: disabled, VRRP-Version: 2
  Interface state: up, Group: 10, State: master, VRRP Mode: Active
  Priority: 120, Advertisement interval: 1, Authentication type: none
  Advertisement threshold: 3, Computed send rate: 0
  Preempt: yes, Accept-data mode: yes, VIP count: 1, VIP: 10.0.0.1           
  Advertisement Timer: 0.502s, Master router: 10.0.0.2
  Virtual router uptime: 01:19:55, Master router uptime: 00:01:27
  Virtual Mac: 00:00:5e:00:01:0a
  Preferred: yes 
  Tracking: enabled 
    Current priority: 120, Configured priority: 120 
    Priority hold time: 45, Not running 
    Interface tracking: enabled, Interface count: 1  
      Interface     Int state   Int speed   Incurred priority cost
      ge-0/0/0.0    up                 1g                       0
    Route tracking: disabled
  • Interface Track이 동작하여 Priority를 120으로 원복하였으며 Backup으로 동작 중이었던 R1은 Master로 동작

 

Oct  4 09:01:09  R1 mib2d[5931]: SNMP_TRAP_LINK_UP: ifIndex 526, ifAdminStatus up(1), ifOperStatus up(1), ifName ge-0/0/0
Oct  4 09:01:55  R1 vrrpd[16092]: VRRPD_NEW_MASTER: Interface irb.10 (local address 10.0.0.2) became VRRP master for group 10 with master reason priority
  • R1은 로그 확인 결과 설정한 'priority-hold-time'과 비슷한 45s 후에 Backup→Master로 변경

 

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