===== Przykładowa konfiguracja OSPF =====
Topologia sieci:
\ internet /
'--------' .--. 10.7.8.8.--.
| 10.6.7.7( R7 )-----------( R8 )
| / '--'10.7.8.7 '--'
| / /24
.--. 10.4.5.5.--. 10.5.6.6.--. /24┌─┴─┐
( R4 )----------( R5 )----------( R6 )---------┤ ⇄ │
'--'10.4.5.4 '--'10.5.6.5 '--'10.6.7.6 └─┬─┘
/24 /24 \
\ .--.
10.6.7.9( R9 )---------------…
'--' 172.18.0.6/16
OSPF ma działać między R5,R6,R7,R8 i R9
Router R4 ma być trasą domyślną i nie używa OSPF
Router R6 ma wbudowany switch na którym są podłączone R7 i R9.
Konfiguracja adresów IP i trasy domyślej na R5:
R5(config)#int gi4
R5(config-if)#ip addr 10.5.6.5 255.255.255.0
R5(config-if)#no shut
R5(config)#int gi5
R5(config-if)#ip addr 10.4.5.5 255.255.255.0
R5(config-if)#no shut
R5(config)#ip route 0.0.0.0 0.0.0.0 10.4.5.4
R5#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is 10.4.5.4 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 10.4.5.4
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C 10.4.5.0/24 is directly connected, GigabitEthernet5
L 10.4.5.5/32 is directly connected, GigabitEthernet5
C 10.5.6.0/24 is directly connected, GigabitEthernet4
L 10.5.6.5/32 is directly connected, GigabitEthernet4
Konfiguracja OSPF na R5:
R5(config)#router ospf 1
R5(config-router)#passive-interface GigabitEthernet 5
R5(config-router)#network 10.4.5.0 0.0.0.255 area 0
R5(config-router)#network 10.5.6.0 0.0.0.255 area 0
R5(config-router)#default-information originate
Wyznaczone trasy na R5:
R5#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is 10.4.5.4 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 10.4.5.4
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C 10.4.5.0/24 is directly connected, GigabitEthernet5
L 10.4.5.5/32 is directly connected, GigabitEthernet5
C 10.5.6.0/24 is directly connected, GigabitEthernet4
L 10.5.6.5/32 is directly connected, GigabitEthernet4
O 10.6.7.0/24 [110/2] via 10.5.6.6, 00:00:30, GigabitEthernet4
O 10.7.8.0/24 [110/3] via 10.5.6.6, 00:00:30, GigabitEthernet4
O 172.18.0.0/16 [110/12] via 10.5.6.6, 00:00:30, GigabitEthernet4
Wyniki wybranych komend diagnostycznych na R5:
R5#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.6.7.6 1 FULL/DR 00:00:31 10.5.6.6 GigabitEthernet4
R5#show ip ospf database
OSPF Router with ID (10.5.6.5) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.5.6.5 10.5.6.5 65 0x80000005 0x00128D 2
10.6.7.6 10.6.7.6 96 0x80000008 0x009FCE 2
10.7.8.7 10.7.8.7 157 0x80000006 0x00FD60 2
10.7.8.8 10.7.8.8 151 0x80000003 0x00208C 1
172.18.0.6 172.18.0.6 234 0x80000006 0x00D96E 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.5.6.6 10.6.7.6 96 0x80000001 0x00B317
10.6.7.9 172.18.0.6 234 0x80000002 0x0079F4
10.7.8.8 10.7.8.8 165 0x80000001 0x00C9EC
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 10.5.6.5 104 0x80000001 0x007028 1
R5#show ip ospf database router 172.18.0.6
OSPF Router with ID (10.5.6.5) (Process ID 1)
Router Link States (Area 0)
LS age: 344
Options: (No TOS-capability, No DC)
LS Type: Router Links
Link State ID: 172.18.0.6
Advertising Router: 172.18.0.6
LS Seq Number: 80000006
Checksum: 0xD96E
Length: 48
Number of Links: 2
Link connected to: a Stub Network
(Link ID) Network/subnet number: 172.18.0.0
(Link Data) Network Mask: 255.255.0.0
Number of MTID metrics: 0
TOS 0 Metrics: 10
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.6.7.9
(Link Data) Router Interface address: 10.6.7.9
Number of MTID metrics: 0
TOS 0 Metrics: 100
Konfiguracja na R6:
R6(config)#interface GigabitEthernet4
R6(config-if)#ip address 10.5.6.6 255.255.255.0
R6(config-if)#no shutdown
R6(config)#interface Vlan1
R6(config-if)#ip address 10.6.7.6 255.255.255.0
R6(config)#router ospf 1
R6(config-router)network 10.5.6.0 0.0.0.255 area 0
R6(config-router)network 10.6.7.0 0.0.0.255 area 0
Tablica tras na R6:
R6#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is 10.5.6.5 to network 0.0.0.0
O*E2 0.0.0.0/0 [110/1] via 10.5.6.5, 00:06:22, GigabitEthernet4
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O 10.4.5.0/24 [110/2] via 10.5.6.5, 00:06:22, GigabitEthernet4
C 10.5.6.0/24 is directly connected, GigabitEthernet4
L 10.5.6.6/32 is directly connected, GigabitEthernet4
C 10.6.7.0/24 is directly connected, Vlan1
L 10.6.7.6/32 is directly connected, Vlan1
O 10.7.8.0/24 [110/2] via 10.6.7.7, 00:07:31, Vlan1
O 172.18.0.0/16 [110/11] via 10.6.7.9, 00:12:27, Vlan1
Polecenia diagnostnycze OSPF na R6:
R6#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 4)
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 10.6.7.6
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
10.5.6.0 0.0.0.255 area 0
10.6.7.0 0.0.0.255 area 0
Routing Information Sources:
Gateway Distance Last Update
10.7.8.7 110 00:37:36
10.5.6.5 110 00:04:29
10.7.8.8 110 00:10:39
172.18.0.6 110 00:00:51
Distance: (default is 110)
R6#show ip ospf
Routing Process "ospf 1" with ID 10.6.7.6
Start time: 10:42:24.620, Time elapsed: 00:42:38.106
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
Supports NSSA (compatible with RFC 3101)
Supports Database Exchange Summary List Optimization (RFC 5243)
Event-log enabled, Maximum number of events: 1000, Mode: cyclic
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
EXCHANGE/LOADING adjacency limit: initial 300, process maximum 300
Number of external LSA 1. Checksum Sum 0x007028
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Reference bandwidth unit is 100 mbps
Area BACKBONE(0)
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:01:12.114 ago
SPF algorithm executed 25 times
Area ranges are
Number of LSA 8. Checksum Sum 0x049427
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 1
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
R6#show ip ospf interface
GigabitEthernet4 is up, line protocol is up
Internet Address 10.5.6.6/24, Area 0, Attached via Network Statement
Process ID 1, Router ID 10.6.7.6, Network Type BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.6.7.6, Interface address 10.5.6.6
Backup Designated router (ID) 10.5.6.5, Interface address 10.5.6.5
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:06
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/2/2, flood queue length 0
Next 0x0(0)/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 10.5.6.5 (Backup Designated Router)
Suppress hello for 0 neighbor(s)
Vlan1 is up, line protocol is up
Internet Address 10.6.7.6/24, Area 0, Attached via Network Statement
Process ID 1, Router ID 10.6.7.6, Network Type BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.6.7.6, Interface address 10.6.7.6
Backup Designated router (ID) 10.7.8.7, Interface address 10.6.7.7
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:09
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/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 2, Adjacent neighbor count is 2
Adjacent with neighbor 10.7.8.7 (Backup Designated Router)
Adjacent with neighbor 172.18.0.6
Suppress hello for 0 neighbor(s)
R6#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.5.6.5 1 FULL/BDR 00:00:37 10.5.6.5 GigabitEthernet4
10.7.8.7 1 FULL/BDR 00:00:38 10.6.7.7 Vlan1
172.18.0.6 1 FULL/DROTHER 00:00:32 10.6.7.9 Vlan1
R6#show ip ospf database
OSPF Router with ID (10.6.7.6) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.5.6.5 10.5.6.5 316 0x80000013 0x00F59B 2
10.6.7.6 10.6.7.6 195 0x8000000D 0x005319 2
10.7.8.7 10.7.8.7 196 0x8000000B 0x00B1AA 2
10.7.8.8 10.7.8.8 335 0x80000004 0x001E8D 1
172.18.0.6 172.18.0.6 102 0x80000010 0x0065DB 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.5.6.6 10.6.7.6 355 0x80000002 0x00B118
10.6.7.6 10.6.7.6 202 0x80000002 0x009C5C
10.7.8.8 10.7.8.8 335 0x80000002 0x00C7ED
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 10.5.6.5 357 0x80000001 0x007028 1
R6#show ip ospf database network
OSPF Router with ID (10.6.7.6) (Process ID 1)
Net Link States (Area 0)
LS age: 372
Options: (No TOS-capability, DC)
LS Type: Network Links
Link State ID: 10.5.6.6 (address of Designated Router)
Advertising Router: 10.6.7.6
LS Seq Number: 80000002
Checksum: 0xB118
Length: 32
Network Mask: /24
Attached Router: 10.6.7.6
Attached Router: 10.5.6.5
LS age: 219
Options: (No TOS-capability, DC)
LS Type: Network Links
Link State ID: 10.6.7.6 (address of Designated Router)
Advertising Router: 10.6.7.6
LS Seq Number: 80000002
Checksum: 0x9C5C
Length: 36
Network Mask: /24
Attached Router: 10.6.7.6
Attached Router: 10.7.8.7
Attached Router: 172.18.0.6
LS age: 352
Options: (No TOS-capability, DC)
LS Type: Network Links
Link State ID: 10.7.8.8 (address of Designated Router)
Advertising Router: 10.7.8.8
LS Seq Number: 80000002
Checksum: 0xC7ED
Length: 32
Network Mask: /24
Attached Router: 10.7.8.8
Attached Router: 10.7.8.7
R6#show ip ospf database router
OSPF Router with ID (10.6.7.6) (Process ID 1)
Router Link States (Area 0)
LS age: 356
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 10.5.6.5
Advertising Router: 10.5.6.5
LS Seq Number: 80000013
Checksum: 0xF59B
Length: 48
AS Boundary Router
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.5.6.6
(Link Data) Router Interface address: 10.5.6.5
Number of MTID metrics: 0
TOS 0 Metrics: 1
Link connected to: a Stub Network
(Link ID) Network/subnet number: 10.4.5.0
(Link Data) Network Mask: 255.255.255.0
Number of MTID metrics: 0
TOS 0 Metrics: 1
LS age: 235
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 10.6.7.6
Advertising Router: 10.6.7.6
LS Seq Number: 8000000D
Checksum: 0x5319
Length: 48
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.5.6.6
(Link Data) Router Interface address: 10.5.6.6
Number of MTID metrics: 0
TOS 0 Metrics: 1
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.6.7.6
(Link Data) Router Interface address: 10.6.7.6
Number of MTID metrics: 0
TOS 0 Metrics: 1
LS age: 236
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 10.7.8.7
Advertising Router: 10.7.8.7
LS Seq Number: 8000000B
Checksum: 0xB1AA
Length: 48
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.7.8.8
(Link Data) Router Interface address: 10.7.8.7
Number of MTID metrics: 0
TOS 0 Metrics: 1
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.6.7.6
(Link Data) Router Interface address: 10.6.7.7
Number of MTID metrics: 0
TOS 0 Metrics: 1
LS age: 375
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 10.7.8.8
Advertising Router: 10.7.8.8
LS Seq Number: 80000004
Checksum: 0x1E8D
Length: 36
Number of Links: 1
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.7.8.8
(Link Data) Router Interface address: 10.7.8.8
Number of MTID metrics: 0
TOS 0 Metrics: 1
LS age: 142
Options: (No TOS-capability, No DC)
LS Type: Router Links
Link State ID: 172.18.0.6
Advertising Router: 172.18.0.6
LS Seq Number: 80000010
Checksum: 0x65DB
Length: 48
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.6.7.6
(Link Data) Router Interface address: 10.6.7.9
Number of MTID metrics: 0
TOS 0 Metrics: 100
Link connected to: a Stub Network
(Link ID) Network/subnet number: 172.18.0.0
(Link Data) Network Mask: 255.255.0.0
Number of MTID metrics: 0
TOS 0 Metrics: 10
R6#sh ip ospf database external
OSPF Router with ID (10.6.7.6) (Process ID 1)
Type-5 AS External Link States
LS age: 1065
Options: (No TOS-capability, DC, Upward)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 10.5.6.5
LS Seq Number: 80000001
Checksum: 0x7028
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
MTID: 0
Metric: 1
Forward Address: 0.0.0.0
External Route Tag: 1
R6#sh ip ospf database self-originate
OSPF Router with ID (10.6.7.6) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.6.7.6 10.6.7.6 941 0x8000000D 0x005319 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.5.6.6 10.6.7.6 1101 0x80000002 0x00B118
10.6.7.6 10.6.7.6 948 0x80000002 0x009C5C
R6#sh ip ospf rib
OSPF Router with ID (10.6.7.6) (Process ID 1)
Base Topology (MTID 0)
OSPF local RIB
Codes: * - Best, > - Installed in global RIB
*> 10.4.5.0/24, Intra, cost 2, area 0
via 10.5.6.5, GigabitEthernet4
* 10.5.6.0/24, Intra, cost 1, area 0, Connected
via 10.5.6.6, GigabitEthernet4
* 10.6.7.0/24, Intra, cost 1, area 0, Connected
via 10.6.7.6, Vlan1
*> 10.7.8.0/24, Intra, cost 2, area 0
via 10.6.7.7, Vlan1
*> 172.18.0.0/16, Intra, cost 11, area 0
via 10.6.7.9, Vlan1
*> 0.0.0.0/0, Ext2, cost 1, fwd cost 1, tag 1
via 10.5.6.5, GigabitEthernet4
Instalacja FRRouting, minimalna konfiguracja i uruchomienie:
zypper in -y frr
sed -i 's/^ospfd=no$/ospfd=yes/' /etc/frr/daemons
systemctl start frr
Konfiguracja frr, w linii poleceń do której wchodzi się komendą
vtysh:
R9# conf t
R9(config)# int enp1s0
R9(config-if)# ip ospf passive
R9(config-if)# exit
R9(config)# router ospf
R9(config-router)# network 10.6.7.0/24 area 0
R9(config-router)# network 172.18.0.0/16 area 0
R9(config-router)# end
Tablica tras Linuksa:
R9:~ # ip route
default via 150.254.32.129 dev br0 proto dhcp
10.4.5.0/24 nhid 25 via 10.6.7.6 dev p4p1 proto ospf metric 20
10.5.6.0/24 nhid 25 via 10.6.7.6 dev p4p1 proto ospf metric 20
10.6.7.0/24 dev p4p1 proto kernel scope link src 10.6.7.9
10.7.8.0/24 nhid 26 via 10.6.7.7 dev p4p1 proto ospf metric 20
150.254.32.128/26 dev br0 proto kernel scope link src 150.254.32.135
172.16.0.0/16 dev enp1s0 scope link
172.18.0.0/16 dev enp1s0 proto kernel scope link src 172.18.0.6
Tablica tras wypisana wewnątrz linii poleceń frr (komenda
vtysh):
R9# sh ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
F - PBR, f - OpenFabric,
> - selected route, * - FIB route, q - queued, r - rejected, b - backup
t - trapped, o - offload failure
O 0.0.0.0/0 [110/1] via 10.6.7.6, p4p1, weight 1, 00:24:11
K>* 0.0.0.0/0 [0/0] via 150.254.32.129, br0, 00:26:10
O>* 10.4.5.0/24 [110/102] via 10.6.7.6, p4p1, weight 1, 00:24:11
O>* 10.5.6.0/24 [110/101] via 10.6.7.6, p4p1, weight 1, 00:24:11
O 10.6.7.0/24 [110/100] is directly connected, p4p1, weight 1, 00:24:11
C>* 10.6.7.0/24 is directly connected, p4p1, 00:24:45
O>* 10.7.8.0/24 [110/101] via 10.6.7.7, p4p1, weight 1, 00:24:11
C>* 150.254.32.128/26 is directly connected, br0, 00:26:10
K>* 172.16.0.0/16 [0/0] is directly connected, enp1s0, 00:26:10
O 172.18.0.0/16 [110/10] is directly connected, enp1s0, weight 1, 00:23:10
C>* 172.18.0.0/16 is directly connected, enp1s0, 00:23:10
Inne polecenia diagnostyczne (długie wyniki ręcznie obcięte):
R9# sh ip ospf database
OSPF Router with ID (172.18.0.6)
Router Link States (Area 0.0.0.0)
Link ID ADV Router Age Seq# CkSum Link count
10.5.6.5 10.5.6.5 1600 0x80000013 0xf59b 2
10.6.7.6 10.6.7.6 1479 0x8000000d 0x5319 2
10.7.8.7 10.7.8.7 1479 0x8000000b 0xb1aa 2
10.7.8.8 10.7.8.8 1617 0x80000004 0x1e8d 1
172.18.0.6 172.18.0.6 1060 0x80000011 0x69d4 2
Net Link States (Area 0.0.0.0)
Link ID ADV Router Age Seq# CkSum
10.5.6.6 10.6.7.6 1639 0x80000002 0xb118
10.6.7.6 10.6.7.6 1486 0x80000002 0x9c5c
10.7.8.8 10.7.8.8 1617 0x80000002 0xc7ed
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
0.0.0.0 10.5.6.5 1641 0x80000001 0x7028 E2 0.0.0.0/0 [0x1]
R9# sh ip ospf
OSPF Routing Process, Router ID: 172.18.0.6
Supports only single TOS (TOS0) routes
This implementation conforms to RFC2328
RFC1583Compatibility flag is disabled
OpaqueCapability flag is disabled
Initial SPF scheduling delay 0 millisec(s)
Minimum hold time between consecutive SPFs 50 millisec(s)
Maximum hold time between consecutive SPFs 5000 millisec(s)
Hold time multiplier is currently 1
SPF algorithm last executed 17m57s ago
Last SPF duration 123 usecs
SPF timer is inactive
LSA minimum interval 5000 msecs
LSA minimum arrival 1000 msecs
Write Multiplier set to 20
Refresh timer 10 secs
Maximum multiple paths(ECMP) supported 256
Administrative distance 110
This router is an ASBR (injecting external routing information)
Number of external LSA 1. Checksum Sum 0x00007028
Number of opaque AS LSA 0. Checksum Sum 0x00000000
Number of areas attached to this router: 1
Area ID: 0.0.0.0 (Backbone)
Number of interfaces in this area: Total: 2, Active: 2
Number of fully adjacent neighbors in this area: 2
Area has no authentication
SPF algorithm executed 8 times
Number of LSA 8
Number of router LSA 5. Checksum Sum 0x000282bf
Number of network LSA 3. Checksum Sum 0x00021561
Number of summary LSA 0. Checksum Sum 0x00000000
Number of ASBR summary LSA 0. Checksum Sum 0x00000000
Number of NSSA LSA 0. Checksum Sum 0x00000000
Number of opaque link LSA 0. Checksum Sum 0x00000000
Number of opaque area LSA 0. Checksum Sum 0x00000000
R9# sh ip ospf database network
OSPF Router with ID (172.18.0.6)
Net Link States (Area 0.0.0.0)
(…)
LS age: 1509
Options: 0x22 : *|-|DC|-|-|-|E|-
LS Flags: 0x6
LS Type: network-LSA
Link State ID: 10.6.7.6 (address of Designated Router)
Advertising Router: 10.6.7.6
LS Seq Number: 80000002
Checksum: 0x9c5c
Length: 36
Network Mask: /24
Attached Router: 10.6.7.6
Attached Router: 10.7.8.7
Attached Router: 172.18.0.6
(…)
R9# sh ip ospf database router
OSPF Router with ID (172.18.0.6)
Router Link States (Area 0.0.0.0)
(…)
LS age: 1561
Options: 0x22 : *|-|DC|-|-|-|E|-
LS Flags: 0x6
Flags: 0x0
LS Type: router-LSA
Link State ID: 10.6.7.6
Advertising Router: 10.6.7.6
LS Seq Number: 8000000d
Checksum: 0x5319
Length: 48
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.5.6.6
(Link Data) Router Interface address: 10.5.6.6
Number of TOS metrics: 0
TOS 0 Metric: 1
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.6.7.6
(Link Data) Router Interface address: 10.6.7.6
Number of TOS metrics: 0
TOS 0 Metric: 1
(…)
R9# sh ip ospf database external
OSPF Router with ID (172.18.0.6)
AS External Link States
LS age: 1777
Options: 0x20 : *|-|DC|-|-|-|-|-
LS Flags: 0x6
LS Type: AS-external-LSA
Link State ID: 0.0.0.0 (External Network Number)
Advertising Router: 10.5.6.5
LS Seq Number: 80000001
Checksum: 0x7028
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 1
Forward Address: 0.0.0.0
External Route Tag: 1
R9# sh ip ospf interface
enp1s0 is up
ifindex 4, MTU 1500 bytes, BW 10000 Mbit
Internet Address 172.18.0.6/16, Broadcast 172.18.255.255, Area 0.0.0.0
MTU mismatch detection: enabled
Router ID 172.18.0.6, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 172.18.0.6 Interface Address 172.18.0.6/16
No backup designated router on this network
Multicast group memberships:
Timer intervals configured, Hello 10s, Dead 40s, Wait 40s, Retransmit 5
No Hellos (Passive interface)
Neighbor Count is 0, Adjacent neighbor count is 0
p4p1 is up
ifindex 3, MTU 1500 bytes, BW 1000 Mbit
Internet Address 10.6.7.9/24, Broadcast 10.6.7.255, Area 0.0.0.0
MTU mismatch detection: enabled
Router ID 172.18.0.6, Network Type BROADCAST, Cost: 100
Transmit Delay is 1 sec, State DROther, Priority 1
Designated Router (ID) 10.6.7.6 Interface Address 10.6.7.6/24
Backup Designated Router (ID) 10.7.8.7, Interface Address 10.6.7.7
Multicast group memberships: OSPFAllRouters
Timer intervals configured, Hello 10s, Dead 40s, Wait 40s, Retransmit 5
Hello due in 8.533s
Neighbor Count is 2, Adjacent neighbor count is 2