10-11-2017 03:50 AM - edited 03-08-2019 12:20 PM
I built a simple ospf lab with 2 3560's (really extreme simple) and single area design with area 0.
the show ip route issued on my core prints some weird metrics that I don't understand yet:
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback1
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/1001] via 10.254.0.2, 01:09:06, GigabitEthernet0/2
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O 10.0.10.0/24 [110/2000] via 10.254.0.2, 01:09:06, GigabitEthernet0/2
O 10.0.1.0/24 [110/2000] via 10.254.0.2, 01:09:06, GigabitEthernet0/2
O 10.0.20.0/24 [110/2000] via 10.254.0.2, 01:09:06, GigabitEthernet0/2
C 10.254.0.0/30 is directly connected, GigabitEthernet0/2
It's a 3 tier campus design where the access layer is l2 based. Connection between core and distribution is 1 gig cable and distribution to access are 4 fa cables via etherchannel.
However, I issued the ospf auto-cost bandwith 1000000 command but still...why do I get those metrics with that high value ???
10-11-2017 04:32 AM
10-11-2017 04:41 AM
upper device:
GigabitEthernet0/2 is up, line protocol is up (connected) Internet Address 10.254.0.1/30, Area 0 Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1000 Enabled by interface config, including secondary ip addresses Transmit Delay is 1 sec, State BDR, Priority 1 Designated Router (ID) 2.2.2.2, Interface address 10.254.0.2 Backup Designated router (ID) 1.1.1.1, Interface address 10.254.0.1 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:01 Supports Link-local Signaling (LLS) Cisco NSF helper support enabled IETF NSF helper support enabled Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 1 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 2.2.2.2 (Designated Router) Suppress hello for 0 neighbor(s) Message digest authentication enabled Youngest key id is 1
below device:
GigabitEthernet0/2 is up, line protocol is up (connected) Internet Address 10.254.0.2/30, Area 0 Process ID 1, Router ID 2.2.2.2, Network Type BROADCAST, Cost: 1000 Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 2.2.2.2, Interface address 10.254.0.2 Backup Designated router (ID) 1.1.1.1, Interface address 10.254.0.1 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:01 Supports Link-local Signaling (LLS) Cisco NSF helper support enabled IETF NSF helper support enabled Index 5/5, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 2 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 1.1.1.1 (Backup Designated Router) Suppress hello for 0 neighbor(s) Message digest authentication enabled Youngest key id is 1
10-11-2017 05:15 AM
10-11-2017 04:15 PM
Hello
This is due to your auto-cost reference bandwidth it has increase 1gb port from cost of 1 to a cost of a 1000
default cost
100mb - cost 1
1000mb -cost 1
auto-cost reference bandwidth 1000
100mb - cost 10
1000mb -cost 1
auto-cost reference bandwidth 10000
100mb - cost 100
1000mb -cost 10
auto-cost reference bandwidth 100000
100mb - cost 1000
1000mb -cost 100
auto-cost reference bandwidth 1000000
100mb - cost 10000
1000mb -cost 1000
res
Paul
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