Overlaps with gigabitethernet0 0 ошибка

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Сообщение от insect_87
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а вы понимаете, что вы делаете?

вроде да. настраивал OSPF

приведу весь конфиг из пакет рэйсера

http://ciscotips.ru/singlearea-ospf-configuration
https://www.smart-soft.ru/blog… tsii_ospf/
https://easy-network.ru/50-urok-30.html
————[R0]————
Press RETURN to get started.

Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int gi 0/0
Router(config-if)#
Router(config-if)#ip ad
Router(config-if)#ip address 10.10.10.2 255.255.255.0
Router(config-if)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up

Router con0 is now available

Press RETURN to get started.

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1.10, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1.20, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1.30, changed state to up

Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#router ospf 1
Router(config-router)#net
Router(config-router)#network 192.168.0.0 0.0.255.255 area 0
Router(config-router)#network 10.10.10.0 0.255.255.255 area 0
Router(config-router)#end
Router#
%SYS-5-CONFIG_I: Configured from console by console

Router#
Router#
Router#
Router#sh ip rou
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, E — EGP
i — IS-IS, 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

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.10.10.0/24 is directly connected, GigabitEthernet0/0
L 10.10.10.2/32 is directly connected, GigabitEthernet0/0
192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.10.0/24 is directly connected, GigabitEthernet0/1.10
L 192.168.10.1/32 is directly connected, GigabitEthernet0/1.10
192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.20.0/24 is directly connected, GigabitEthernet0/1.20
L 192.168.20.1/32 is directly connected, GigabitEthernet0/1.20
192.168.30.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.30.0/24 is directly connected, GigabitEthernet0/1.30
L 192.168.30.1/32 is directly connected, GigabitEthernet0/1.30

Router#sh ospf neig
^
% Invalid input detected at ‘^’ marker.

Router#
01:26:44: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.12.1 on GigabitEthernet0/0 from LOADING to FULL, Loading Done

Router#sh ip rout
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, E — EGP
i — IS-IS, 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

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.10.10.0/24 is directly connected, GigabitEthernet0/0
L 10.10.10.2/32 is directly connected, GigabitEthernet0/0
192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.10.0/24 is directly connected, GigabitEthernet0/1.10
L 192.168.10.1/32 is directly connected, GigabitEthernet0/1.10
O 192.168.11.0/24 [110/2] via 10.10.10.3, 00:00:32, GigabitEthernet0/0
O 192.168.12.0/24 [110/2] via 10.10.10.3, 00:00:32, GigabitEthernet0/0
192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.20.0/24 is directly connected, GigabitEthernet0/1.20
L 192.168.20.1/32 is directly connected, GigabitEthernet0/1.20
192.168.30.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.30.0/24 is directly connected, GigabitEthernet0/1.30
L 192.168.30.1/32 is directly connected, GigabitEthernet0/1.30

Router#
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface GigabitEthernet0/0
Router(config-if)#
Router(config-if)#exit
Router(config)#interface GigabitEthernet0/1
Router(config-if)#
Router(config-if)#exit
Router(config)#interface GigabitEthernet0/2
Router(config-if)#no shutdown
Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up
en
% Ambiguous command: «en»
Router(config)#int gi 0/1.150
Router(config-subif)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1.150, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1.150, changed state to up
en do 150
Router(config-subif)#ip ad 192.168.150.1 255.255.255.0
Router(config-subif)#end
Router#
%SYS-5-CONFIG_I: Configured from console by console

Router#
Router#
Router#
Router#
Router#sh ip ro
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, E — EGP
i — IS-IS, 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

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.10.10.0/24 is directly connected, GigabitEthernet0/0
L 10.10.10.2/32 is directly connected, GigabitEthernet0/0
192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.10.0/24 is directly connected, GigabitEthernet0/1.10
L 192.168.10.1/32 is directly connected, GigabitEthernet0/1.10
O 192.168.11.0/24 [110/2] via 10.10.10.3, 00:07:27, GigabitEthernet0/0
O 192.168.12.0/24 [110/2] via 10.10.10.3, 00:07:27, GigabitEthernet0/0
192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.20.0/24 is directly connected, GigabitEthernet0/1.20
L 192.168.20.1/32 is directly connected, GigabitEthernet0/1.20
192.168.30.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.30.0/24 is directly connected, GigabitEthernet0/1.30
L 192.168.30.1/32 is directly connected, GigabitEthernet0/1.30
O 192.168.50.0/24 [110/3] via 10.10.10.3, 00:05:34, GigabitEthernet0/0
O 192.168.60.0/24 [110/3] via 10.10.10.3, 00:05:34, GigabitEthernet0/0
O 192.168.100.0/24 [110/2] via 10.10.10.3, 00:01:14, GigabitEthernet0/0
192.168.150.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.150.0/24 is directly connected, GigabitEthernet0/1.150
L 192.168.150.1/32 is directly connected, GigabitEthernet0/1.150
O 192.168.200.0/24 [110/3] via 10.10.10.3, 00:02:49, GigabitEthernet0/0
O 192.168.201.0/24 [110/3] via 10.10.10.3, 00:02:26, GigabitEthernet0/0

Router#
————[R1]————
Press RETURN to get started!

Router>enable
Router#
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface GigabitEthernet0/0
Router(config-if)#no shutdown
Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up

Router(config-if)#ip ad
Router(config-if)#ip address 10.10.10.3 255.255.255.0
Router(config-if)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up

Router(config-if)#end
Router#
%SYS-5-CONFIG_I: Configured from console by console

Router#
Router#
Router#
Router#ping 10.10.10.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 0/8/34 ms

Router#ping 192.168.10.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.10.1, timeout is 2 seconds:
…..
Success rate is 0 percent (0/5)

Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int gi 0/1.11
Router(config-subif)#en do 11
Router(config-subif)#ip ad 192.168.11.1 255.255.255.0
Router(config-subif)#int gi 0/1.12
Router(config-subif)#en do 12
Router(config-subif)#ip ad 192.168.12.1 255.255.255.0
Router(config-subif)#int gi 0/2
Router(config-if)#ip ad 10.10.10.4 255.255.255.0
% 10.10.10.0 overlaps with GigabitEthernet0/0
Router(config-if)#
Router(config-if)#exit
Router(config)#interface GigabitEthernet0/2
Router(config-if)#no shutdown
% 10.10.10.0 overlaps with GigabitEthernet0/0
GigabitEthernet0/2: incorrect IP address assignment
Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed state to up

Router(config-if)#
Router(config-if)#
Router(config-if)#end
Router#
%SYS-5-CONFIG_I: Configured from console by console

Router#
Router#
Router#sh ip ro
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, E — EGP
i — IS-IS, 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

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.10.10.0/24 is directly connected, GigabitEthernet0/0
is directly connected, GigabitEthernet0/2
L 10.10.10.3/32 is directly connected, GigabitEthernet0/0
L 10.10.10.4/32 is directly connected, GigabitEthernet0/2

Router#
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface GigabitEthernet0/1
Router(config-if)#no shutdown
Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up

%LINK-5-CHANGED: Interface GigabitEthernet0/1.11, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1.11, changed state to up

%LINK-5-CHANGED: Interface GigabitEthernet0/1.12, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1.12, changed state to up

Router con0 is now available

Press RETURN to get started.

Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#router ospf 1
Router(config-router)#net 192.168.0.0 0.0.255.255 area 0
Router(config-router)#net 10.10.10.0 0.255.255.255 area 0
Router(config-router)#
01:07:47: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.30.1 on GigabitEthernet0/0 from LOADING to FULL, Loading Done

Router(config-router)#end
Router#
%SYS-5-CONFIG_I: Configured from console by console

Router#
Router#sh ip rout
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, E — EGP
i — IS-IS, 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

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.10.10.0/24 is directly connected, GigabitEthernet0/0
is directly connected, GigabitEthernet0/2
L 10.10.10.3/32 is directly connected, GigabitEthernet0/0
L 10.10.10.4/32 is directly connected, GigabitEthernet0/2
O 192.168.10.0/24 [110/2] via 10.10.10.2, 00:00:12, GigabitEthernet0/0
192.168.11.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.11.0/24 is directly connected, GigabitEthernet0/1.11
L 192.168.11.1/32 is directly connected, GigabitEthernet0/1.11
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/1.12
L 192.168.12.1/32 is directly connected, GigabitEthernet0/1.12
O 192.168.20.0/24 [110/2] via 10.10.10.2, 00:00:12, GigabitEthernet0/0
O 192.168.30.0/24 [110/2] via 10.10.10.2, 00:00:12, GigabitEthernet0/0

Router#
01:09:29: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.60.1 on GigabitEthernet0/2 from LOADING to FULL, Loading Done

Router#en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int gi 0/1.500
Router(config-subif)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1.500, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1.500, changed state to up
en do 500
Router(config-subif)#ip ad 192.168.100.1 255.255.255.0
Router(config-subif)#
————[R2]————
Press RETURN to get started.

Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#route ospf 1
Router(config-router)#net 192.168.0.0 0.0.255.255 area 0
Router(config-router)#net 10.10.10.0 0.255.255.255 area 0
Router(config-router)#
01:04:51: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.12.1 on GigabitEthernet0/2 from LOADING to FULL, Loading Done

Router(config-router)#end
Router#
%SYS-5-CONFIG_I: Configured from console by console

Router#
Router#
Router#sh ip rou
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, E — EGP
i — IS-IS, 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

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.10.10.0/24 is directly connected, GigabitEthernet0/2
L 10.10.10.5/32 is directly connected, GigabitEthernet0/2
169.193.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 169.193.70.0/24 is directly connected, GigabitEthernet0/1.70
L 169.193.70.1/32 is directly connected, GigabitEthernet0/1.70
O 192.168.10.0/24 [110/3] via 10.10.10.4, 00:00:04, GigabitEthernet0/2
O 192.168.11.0/24 [110/2] via 10.10.10.4, 00:00:04, GigabitEthernet0/2
O 192.168.12.0/24 [110/2] via 10.10.10.4, 00:00:04, GigabitEthernet0/2
O 192.168.20.0/24 [110/3] via 10.10.10.4, 00:00:04, GigabitEthernet0/2
O 192.168.30.0/24 [110/3] via 10.10.10.4, 00:00:04, GigabitEthernet0/2
192.168.50.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.50.0/24 is directly connected, GigabitEthernet0/1.50
L 192.168.50.1/32 is directly connected, GigabitEthernet0/1.50
192.168.60.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.60.0/24 is directly connected, GigabitEthernet0/1.60
L 192.168.60.1/32 is directly connected, GigabitEthernet0/1.60

Router#sh ospf data
^
% Invalid input detected at ‘^’ marker.

Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#sh ospf data
^
% Invalid input detected at ‘^’ marker.

Router(config)#sh ?
% Unrecognized command
Router(config)#show ?
% Unrecognized command
Router(config)#end
Router#
%SYS-5-CONFIG_I: Configured from console by console

Router#
Router#
Router#
Router#sh?
show
Router#sh ?
aaa Show AAA values
access-lists List access lists
arp Arp table
cdp CDP information
class-map Show QoS Class Map
clock Display the system clock
controllers Interface controllers status
crypto Encryption module
debugging State of each debugging option
dhcp Dynamic Host Configuration Protocol status
dot11 IEEE 802.11 show information
file Show filesystem information
flash: display information about flash: file system
flow Flow information
frame-relay Frame-Relay information
history Display the session command history
hosts IP domain-name, lookup style, nameservers, and host table
interfaces Interface status and configuration
ip IP information
ipv6 IPv6 information
license Show license information
line TTY line information
lldp LLDP information
logging Show the contents of logging buffers
login Display Secure Login Configurations and State
mac-address-table MAC forwarding table
ntp Network time protocol
parser Show parser commands
policy-map Show QoS Policy Map
pppoe PPPoE information
privilege Show current privilege level
processes Active process statistics
protocols Active network routing protocols
queue Show queue contents
queueing Show queueing configuration
running-config Current operating configuration
secure Show secure image and configuration archive
sessions Information about Telnet connections
snmp snmp statistics
spanning-tree Spanning tree topology
ssh Status of SSH server connections
standby standby configuration
startup-config Contents of startup configuration
storm-control Show storm control configuration
tcp Status of TCP connections
tech-support Show system information for Tech-Support
terminal Display terminal configuration parameters
users Display information about terminal lines
version System hardware and software status
vlan-switch VTP VLAN status
vtp Configure VLAN database
zone Zone Information
zone-pair Zone pair information
Router#sh ip protoc

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 192.168.60.1
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
192.168.0.0 0.0.255.255 area 0
10.0.0.0 0.255.255.255 area 0
Routing Information Sources:
Gateway Distance Last Update
192.168.12.1 110 00:01:13
192.168.30.1 110 00:02:55
192.168.60.1 110 00:01:03
Distance: (default is 110)

Router#sh ip neig
^
% Invalid input detected at ‘^’ marker.

Router#sh ospf neig
^
% Invalid input detected at ‘^’ marker.

Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int gi 0/2.200
Router(config-subif)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2.200, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2.200, changed state to up

Router(config-subif)#en do 200
Router(config-subif)#ip ad 192.168.200.1 255.255.255.0
Router(config-subif)#int gi 0/2.201
Router(config-subif)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2.201, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2.201, changed state to up
en do 201
Router(config-subif)#ip ad 192.168.201.1 255.255.255.0
Router(config-subif)#
Router(config-subif)#end
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface GigabitEthernet0/2
Router(config-if)#
%SYS-5-CONFIG_I: Configured from console by console

Router(config-if)#exit
Router(config)#interface GigabitEthernet0/1
Router(config-if)#
Router(config-if)#exit
Router(config)#interface GigabitEthernet0/0
Router(config-if)#
Router(config-if)#exit
Router(config)#interface GigabitEthernet0/0
Router(config-if)#no shutdown
Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up



0



Источник

When does this error appear?

This error appears while attempting to configure a Layer 3 interface on a router or switch running Cisco IOS. It appears in one of the following 2 cases:

  • When using the ip address command; or,
  • When issuing the no shutdown command

Why does this error appear?

This error appears when multiple interfaces on a router are configured with IP Addresses from overlapping subnets.

Let’s look at an example:

In the following scenario, there is one router connected to 2 switches.

  • Interface gi0/1 is enabled, connected to Switch1, and assigned the IP Address 172.20.100.1 255.255.254.0
  • Interface gi0/0 is enabled and connected to Switch2. There is no IP Address assigned to gi0/0.
Router1 Switch1

172.20.100.1/23

gi0/1
gi0/0
Switch2

Suppose we now try to configure an IP Address on interface gi0/0. We attempt to configure the IP Address 172.20.101.1 255.255.255.0:

Router1 Console

Router1(config)#interface gi0/0

Router1(config-if)#ip address 172.20.101.1 255.255.255.0

% 172.20.101.0 overlaps with GigabitEthernet0/1

Router1(config-if)#

Interface gi0/1 is already connected to the network 172.20.100.0/23. This network covers the range of addresses from:

172.20.100.0 to 172.20.101.255

The network 172.20.101.0/24 covers the range of addresses from:

172.20.101.0 to 172.20.101.255

When we attempt to configure int gi0/0 with the IP Address 172.20.101.1 255.255.255.0 we are essentially assigning the interface to the network 172.20.101.0 /24

We cannot assign multiple interfaces to overlapping subnets. The router outputs a message indicating that the network 172.20.101.0 overlaps with the network connected to interface gi0/1.

A second example:

Let’s modify the scenario a little bit. In this scenario

  • Interface gi0/1 is enabled, connected to Switch1, and assigned the IP Address 172.20.100.1 255.255.254.0
  • Interface gi0/0 is shutdown and connected to Switch2. There is no IP Address assigned to gi0/0.
Router1 Switch1

172.20.100.1/23

gi0/1
gi0/0
Switch2

Suppose we now try to configure an IP Address on interface gi0/0. We attempt to configure the IP Address 172.20.101.1 255.255.255.0:

Router1 Console

Router1(config)#interface gi0/0

Router1(config-if)#ip address 172.20.101.1 255.255.255.0

Router1(config-if)#

This time we are allowed to configure the IP Address and do not receive an error message. Why is that?

At this point gi0/0 is shutdown. Even if we configure an IP Address on it, this interface will not be involved in any routing decisions.

While the line protocol on an interface is down, we are allowed to configure an IP Address on it even if it overlaps with the network connected to another interface.

Let us now try to enable the interface. (It is already connected to an enabled interface on another device.)

Router1 Console

Router1(config)#interface gi0/0

Router1(config-if)#ip address 172.20.101.1 255.255.255.0

Router1(config-if)#no shutdown

% 172.20.101.0 overlaps with GigabitEthernet0/1

Router1(config-if)#

When we enter the no shutdown command, the router outputs a message indicating that the network 172.20.101.0 overlaps with the network connected to interface gi0/1.

The interface remains administratively shutdown.

If we first shutdown interface gi0/1, we are then allowed to enable gi0/0 with its existing IP Address configuration:

Router1 Console

Router1(config)#interface gi0/0

Router1(config-if)#ip address 172.20.101.1 255.255.255.0

Router1(config-if)#no shutdown

% 172.20.101.0 overlaps with GigabitEthernet0/1

Router1(config)#interface gi0/1

Router1(config-if)#shutdown

%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to administratively down

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down

Router1(config)#interface gi0/0

Router1(config-if)#no shutdown

%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up

Router1(config-if)#

Источник

I am trying to set up a network of for different organisational departments based on a given typology:

Given Typology

Using Cisco 2911 routers & 2960-24TT Switches.

With given addressing of: 

'EIGRP 101' 172.16.16.0 /16
and
'OSPF 2018' Addressing of 192.168.17.0 /24

from this I created a network addressing scheme:
Addressing Scheme

Using my addressing scheme and based on the given typology — I have attempted to recreate in Packet Tracer the network here:
Created Typology

As you can see in the top left ‘Management’ department subnet I have managed to set up Router0 through the Gi0/2 interface using the router’s CLI. However, using my addressing scheme, I was unable to set up the same router for the ‘Engineering’ department through Router0’s Gi0/1 interface due to a ‘overlap’ error:

Press RETURN to get started!

Router>en Router#conf terminal  Enter configuration commands, one per
line.  End with CNTL/Z. 
Router(config)#interface gigabitEthernet 0/2 
Router(config-if)#ip address 172.16.16.1 255.255.0.0
Router(config-if)#no shutdown 

Router(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed 
state to up

Router(config-if)#do wr
Building configuration...
[OK]
Router(config-if)#exit
Router(config)#interface gigabitEthernet 0/1
Router(config-if)#ip address 172.16.16.65 255.255.0.0
% 172.16.0.0 overlaps with GigabitEthernet0/2
Router(config-if)#

Is my addressing scheme wrong? Or am I using the Packet Tracer or the routers CLI incorrectly?

Thanks!

Источник

This is my router! the topology is one router connected to one pc on g0/1, on g0/0 its connected to a switch then connected to a pc. the whole network is 202.101.99.0/24, using VLSM we had to break it down first with 98 usable hosts so I decided for the IP address of the router for g0/0 I want to use 202.101.99.129 255.255.255.128., then I assigned the pc 202.101.99.130, I went to assign the IP address to the g0/0 and its saying theyre over lapping..why is this 

bye>    
bye>enable    
bye#config t     
bye(config)#interface g0/1    
bye(config-if)#ip address 202.101.99.129 255.255.255.128    
bye(config-if)#no shutdown    
bye(config-if)#exit    
bye(config)#int g0/0    
bye(config-if)#ip address 202.101.99.161 255.255.255.224     
% 202.101.99.160 overlaps with GigabitEthernet0/1    
bye(config-if)#ip address 202.101.99.193 255.255.255.224    
% 202.101.99.192 overlaps with GigabitEthernet0/1   
bye(config-if)#ip address 202.101.99.163 255.255.255.128    
% 202.101.99.128 overlaps with GigabitEthernet0/1    
bye(config-if)#

Vomit IT - Chunky Mess Style's user avatar

asked Dec 4, 2018 at 2:14

user969645's user avatar

2

For interface g0/1 you’re using the network 202.101.99.128 /25. With this, the network address is 202.101.99.128, the usable hosts range from 202.101.99.129-202.101.99.254. Your broadcast address would be 202.101.99.255.

For interface g0/0 you assigned it 202.101.99.161 which is using the 202.101.99.160 /27 network. This overlaps with your previous network. Because as stated above, the 202.101.99.128 /25 network covers the ranges .129-.254.

By looking at the chart below, you can see that your first network takes up all of the addresses in the red box, ranging from .128 - .255 In order to not have overlap, you would have to assign g0/0 one of the network addresses in the green box.

If each network is supposed to have 98 usable hosts, your best option would be to use the 202.101.99.0 /25 and 202.101.99.128 /25 networks

enter image description here

answered Dec 4, 2018 at 2:38

DrZoo's user avatar

DrZooDrZoo

10.3k4 gold badges39 silver badges60 bronze badges

5

Источник

Для интерфейса g0/1 вы используете сеть 202.101.99.128 /25 . При этом сетевой адрес — 202.101.99.128 , диапазон используемых хостов — 202.101.99.129-202.101.99.254 . Ваш широковещательный адрес будет 202.101.99.255 .

Для интерфейса g0/0 вы назначили его 202.101.99.161 который использует сеть 202.101.99.160 /27 . Это совпадает с вашей предыдущей сетью. Поскольку, как указано выше, сеть 202.101.99.128 /25 охватывает диапазоны .129-.254 .

Взглянув на диаграмму ниже, вы увидите, что ваша первая сеть занимает все адреса в красном поле, в диапазоне от .128 - .255 Чтобы не перекрывать друг друга, вам необходимо назначить g0/0 один сетевые адреса в зеленом поле.

Если предполагается, что каждая сеть имеет 98 используемых хостов, лучшим вариантом будет использование 202.101.99.0 /25 и 202.101.99.128 /25

Источник

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