R2config#router eigrp 1 R2config-router#redistribute ospf 1?. match Redistribution of OSPF routes metric Metric for redistributed routes route-map Route map reference... Bandwidth metric
Trang 1interface Loopback1
ip address 1.1.1.1 255.255.255.0
!
interface Loopback12
ip address 12.12.12.12 255.0.0.0
!
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0 router eigrp 1
network 1.1.1.1 0.0.0.0
network 12.12.12.12 0.0.0.0
network 192.168.12.0
no auto-summary
R2# show run
router eigrp 1
network 192.168.12.0
auto-summary
!
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
network 2.2.2.0 0.0.0.255 area 0 network 192.168.23.0 0.0.0.255 area 0 R2# sh ip route
Trang 2C 192.168.12.0/24 is directly connected, FastEthernet0/0
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/156160] via 192.168.12.1, 00:25:13, FastEthernet0/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback1
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 192.168.23.2, 00:12:09, FastEthernet1/0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 192.168.23.2, 00:12:09, FastEthernet1/0
C 192.168.23.0/24 is directly connected, FastEthernet1/0
D 12.0.0.0/8 [90/156160] via 192.168.12.1, 00:02:20, FastEthernet0/0
R3# show ip route
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 192.168.23.1, 00:14:10, FastEthernet1/0
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback3
4.0.0.0/25 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback4
C 192.168.23.0/24 is directly connected, FastEthernet1/0
Sau đó vào R2 redistribute
R2(config-router)#redistribute eigrp 1 subnets
Và vào R3 xem lại
O E2 192.168.12.0/24 [110/20] via 192.168.23.1, 00:00:53, FastEthernet1/0 1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [110/20] via 192.168.23.1, 00:00:53, FastEthernet1/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 192.168.23.1, 00:00:53, FastEthernet1/0
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback3
4.0.0.0/25 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback4
C 192.168.23.0/24 is directly connected, FastEthernet1/0
O E2 12.0.0.0/8 [110/20] via 192.168.23.1, 00:00:53, FastEthernet1/0 Sau đó vào lại R2 gõ lệnh.
R2(config)#router ospf 1
R2(config-router)#no redistribute eigrp 1 subnets
R2(config-router)#redistribute eigrp 1
Trang 3% Only classful networks will be redistributed
Qua R3 xem thấy route 1.1.1.0/24 đã mất.
O E2 192.168.12.0/24 [110/20] via 192.168.23.1, 00:04:23, FastEthernet1/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 192.168.23.1, 00:04:23, FastEthernet1/0
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback3
4.0.0.0/25 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback4
C 192.168.23.0/24 is directly connected, FastEthernet1/0
O E2 12.0.0.0/8 [110/20] via 192.168.23.1, 00:04:23, FastEthernet1/0
Kết Luận:
Redistribute có dùng từ khóa subnets sẽ redistribute tất cả các route
Redistribute không dùng từ khóa subnets chỉ redistribute những mạng nào là major thôi [Không có từ khóa subnets]
Sau đó vào R2 bỏ redistribute qua R3
R2(config-router)#no redistribute eigrp 1 subnets
R2(config-router)#no redistribute eigrp 1
R2# show ip route
C 192.168.12.0/24 is directly connected, FastEthernet0/0
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/156160] via 192.168.12.1, 00:03:48, FastEthernet0/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback1
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 192.168.23.2, 00:01:10, FastEthernet1/0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 192.168.23.2, 00:01:10, FastEthernet1/0
C 192.168.23.0/24 is directly connected, FastEthernet1/0
D 12.0.0.0/8 [90/156160] via 192.168.12.1, 00:03:48, FastEthernet0/0
Ta thấy R2 học mạng loopback qua R3 chỉ toàn là /32 vì OSPF là giao thức linkstate nên nó sẽ quảng bá trạng thái link qua LSA chứ không quảng bá route.
Nên OSPF hiểu mạng loopback không kết nối bất cứ ai nên nó sẽ /32.
R3#sh ip os interface
Loopback3 is up, line protocol is up
Trang 4Internet Address 3.3.3.3/8, Area 0
Process ID 1, Router ID 3.3.3.3, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Loopback4 is up, line protocol is up
Internet Address 4.4.4.4/25, Area 0
Process ID 1, Router ID 3.3.3.3, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Nên do đó ta chuyển Network Type LOOPBACK về dạng point-to-point để R2 học OSPF qua đúng /24 và /25.
R3(config)#int loopback 3
R3(config-if)#ip ospf network point-to-point
R3(config)#int loopback 4
R3(config-if)#ip ospf network point-to-point
Loopback4 is up, line protocol is up
Internet Address 4.4.4.4/25, Area 0
Process ID 1, Router ID 3.3.3.3, Network Type POINT_TO_POINT, Cost: 1
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Loopback3 is up, line protocol is up
Internet Address 3.3.3.3/8, Area 0
Process ID 1, Router ID 3.3.3.3, Network Type POINT_TO_POINT, Cost: 1
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Qua R2 xem lại.
R2#sh ip rou
C 192.168.12.0/24 is directly connected, FastEthernet0/0
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/156160] via 192.168.12.1, 00:14:30, FastEthernet0/0
2.0.0.0/24 is subnetted, 1 subnets
Trang 5C 2.2.2.0 is directly connected, Loopback1
O 3.0.0.0/8 [110/2] via 192.168.23.2, 00:01:37, FastEthernet1/0
4.0.0.0/25 is subnetted, 1 subnets
O 4.4.4.0 [110/2] via 192.168.23.2, 00:01:37, FastEthernet1/0
C 192.168.23.0/24 is directly connected, FastEthernet1/0
D 12.0.0.0/8 [90/156160] via 192.168.12.1, 00:14:30, FastEthernet0/0
Bây giờ ta bắt đầu redistribute từ OSPF qua EIGRP [tiến hành trên R2 ]
R2# sh interface f0/0
FastEthernet0/0 is up, line protocol is up
Hardware is DEC21140, address is ca01.0204.0000 (bia ca01.0204.0000)
Internet address is 192.168.12.2/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:04, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
291 packets input, 27945 bytes
Received 289 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
408 packets output, 34906 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Vì ta những route được redistribute từ R2 qua R1 sẽ chỉ qua cổng f0/0 nên ta show
sh interface f0/0 để xem những thông số về metric hồi đánh vào lúc redistribute R2(config)#router eigrp 1
R2(config-router)#redistribute ospf 1 ?
match Redistribution of OSPF routes
metric Metric for redistributed routes
route-map Route map reference
Trang 6vrf VPN Routing/Forwarding Instance
R2(config-router)#redistribute ospf 1 metric ?
<1-4294967295> Bandwidth metric in Kbits per second
R2(config-router)#redistribute ospf 1 metric 100000 ?
<0-4294967295> EIGRP delay metric, in 10 microsecond units
R2(config-router)#redistribute ospf 1 metric 100000 100 ?
<0-255> EIGRP reliability metric where 255 is 100% reliable
R2(config-router)#redistribute ospf 1 metric 100000 100 255 ?
<1-255> EIGRP Effective bandwidth metric (Loading) where 255 is 100% loaded
R2(config-router)#redistribute ospf 1 metric 100000 100 255 1 ?
<1-65535> EIGRP MTU of the path
R2(config-router)#redistribute ospf 1 metric 100000 10 255 1 1500
Kết luận:
-Ta cũng thấy rõ là redistribute bất cứ giao thức nào vào EIGRP đều không có từ khóa subnets [nhưng EIGRP vẫn redistribue tất cả các subnet vào]
Vậy nếu R2 nối thêm một router R24 cũng chạy EIGRP với AS2 nữa chẳng hạn, thì
ta chỉ cần vào mode router EIGRP 2 mà redistribute từ OSPF vào EIGRP2.
Nhưng rủi cả R1 và R24 cùng chạy EIGRP 1 và cần thấy mạng R3 với một bên nối serial và một bên là fast internet thì chỉnh metric ra sao đây? Thì ta cứ việc chỉnh metric 1 1 1 1 1 Chỉnh metric chỉ có tác dụng cho R1 và R24 hiểu đúng metric đến mạng của R3 thôi.
-Và Delay mặc dầu trong interface là 100 nhưng ta chỉ gõ 10 là vì delay trong câu lệnh metric tính theo đơn vị 10.