hi:
i am using Packet tracer to test OSPF DR and BDR bidding.
according to text book, if the interface's router ID is the highest , it will become DR and the next highest will be BDR.
but in my test, i don't see this happening .
R1's conf
interface Loopback101
ip address 100.100.100.100 255.255.255.0
!
interface FastEthernet0/0
ip address 1.1.1.10 255.0.0.0
duplex auto
speed auto
!
interface FastEthernet1/0
no ip address
duplex auto
speed auto
shutdown
!
interface Serial2/0
no ip address
shutdown
!
interface Serial3/0
no ip address
shutdown
!
interface FastEthernet4/0
no ip address
shutdown
!
interface FastEthernet5/0
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 1
!
ip classless
!
!
!
!
!
!
!
line con 0
line vty 0 4
login
!
!
!
end
R1's "show ip protocols"
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 100.100.100.100
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
0.0.0.0 255.255.255.255 area 1
Routing Information Sources:
Gateway Distance Last Update
1.1.1.1 110 00:00:43
Distance: (default is 110)
R2's conf
hostname R2
!
!
interface Loopback1
ip address 10.10.10.10 255.255.255.0
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet1/0
ip address 1.1.1.1 255.0.0.0
duplex auto
speed auto
!
interface Serial2/0
no ip address
shutdown
!
interface Serial3/0
no ip address
shutdown
!
interface FastEthernet4/0
no ip address
shutdown
!
interface FastEthernet5/0
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 1
!
ip classless
!
!
!
!
!
!
!
line con 0
line vty 0 4
login
!
!
!
end
R2's IP protocol details
Routing Protocol is "ospf 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.10.10.10
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
0.0.0.0 255.255.255.255 area 1
Routing Information Sources:
Gateway Distance Last Update
1.1.1.10 110 00:01:51
Distance: (default is 110)
obviously R1 has higher router ID.
but at the end
R1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.10.10.10 1 FULL/BDR 00:00:35 1.1.1.1 FastEthernet0
R2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
100.100.100.100 1 FULL/DR 00:00:35 1.1.1.10 FastEthernet1/0
as it shows from above data, R2 was chosen as DR despite that R1 has higher Router ID and they both have same priority number.
please help me out on this, i have been thinking for hours.
