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Replies

No link between Router and Switch (can't make a connection to any of the switch ports)

Reprovoid
Level 1
Level 1

Can't get cisco router and switch to see each other?

When I connect the 2620 router to a 2950 switch no link lights turn on. It's the same when I connect any router to either of the two 2950 switches I have.I can connect to both switch and router from a pc using telnet and the router can connect to a regular tp-link switch.I'm a newbie when It comes to Cisco so any help would be appreciated.Here's the running config for the router and switch.There Is no connection when using any of the switch ports to connect to the fa0/0 of the router.

Router:

!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname ReprovoR2
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$tE9o$76/0ZcMFQ5WnYMNQJTvwI/
!
no aaa new-model
!
resource policy
!
ip subnet-zero
ip cef
!
!
no ip dhcp use vrf connected
!
!
ip ftp username reprovo
ip ftp password reprovoforealman
no ip ips deny-action ips-interface
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.6.2 255.255.255.0
clockrate 128000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
router rip
version 2
network 192.168.6.0
network 192.168.10.0
!
ip classless
!
no ip http server
no ip http secure-server
!
!
!
control-plane
!
!
!
!
line con 0
password 1378
login
line aux 0
line vty 0 4
password
login
line vty 5 15
password
login
!
!
end

Switch:

!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Reprovo1
!
enable secret 5 $1$9sWB$fw8pRBhzFo.89JVtXG5JP1
!
ip subnet-zero
!
ip ftp username reprovo
ip ftp password reprovoforealman
ip ssh time-out 120
ip ssh authentication-retries 3
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
!
interface FastEthernet0/1
switchport mode access
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface FastEthernet0/25
!
interface FastEthernet0/26
!
interface Vlan1
ip address 192.168.10.22 255.255.255.0
no ip route-cache
!
ip default-gateway 192.168.10.1
ip http server
banner login 

!
line con 0
exec-timeout 0 0
password 1378
login
line vty 0 4
password
login
line vty 5 15
password
login
!
!
end

3 Accepted Solutions

Accepted Solutions

cadet alain
VIP Alumni
VIP Alumni

Hi,

Did you choose the correct type of cable because 2950 doesn't support autoMDIX, are the ports on the router not administratively down? if not then issue no shut command under them.

Alain.

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View solution in original post

hi,

kindly remove this line on your switch and try again:

int f0/1

no switchport mode access

View solution in original post

Hi ,

Maybe I haven't had enough coffee this morning but I don't see how the fact  that the port was in access mode was creating the problem as apparently the router had no subinterfaces configured.

Can you explain what obvious stuff i've missed here.

Alain.

Don't forget to rate helpful posts.

View solution in original post

18 Replies 18

cadet alain
VIP Alumni
VIP Alumni

Hi,

Did you choose the correct type of cable because 2950 doesn't support autoMDIX, are the ports on the router not administratively down? if not then issue no shut command under them.

Alain.

Don't forget to rate helpful posts.

Hi.

I am using the correct type of cable (straight through).All the ports function when connected to another switch or to a pc.

Hi,

can you post output of sh interface f0/1  status and sh interface f0/1 switchport on the switch as well as sh int f0/0 on the router.

Alain.

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Switch

Sh Interface f0/1 status: notconnect  vlan 1  duplex,speed auto type 10/100 base tx

Sh Interface f0/1 switchport:
Name fa0/1

Switchport enabled

Administrative mode: static access

operational mode: down

Administrative Trunking encapsulation dot1q

Negotiation of trunking off

Access mode Vlan 1 (default)

Voice Vlan none

Administrative private vlan host association none

mapping none

trunk native vlan none

trunk encapsulation dot1q

trunk normla Vlan none

Trunk private Vlan none

Trunking Vlans enabled all

Pruning Vlans enabled 2-1001

Capture moded disabled

Capture Vlans allowed all

Protected false

Appliance trust none

Router:F0/0 Is up ,line protocol is down

           internet address 192.168.10.1/24

           Encapsulation ARPA , loopback not set

           Keepalive (10 sec)

           Auto duplex , speed 100 base tx/fx

Sorry , I typed these out.I know how to copy the running config to an ftp server but thats It!

Is It something to do with the encapsulation ?

hi,

kindly remove this line on your switch and try again:

int f0/1

no switchport mode access

Accidentally clicked correct answer.No change.All ports remain In a notconnect state line Is up protocol Is down

Hi,

so if you connect a PC or another router to this switch port it is ok?

Alain.

Don't forget to rate helpful posts.

Hi ,

Maybe I haven't had enough coffee this morning but I don't see how the fact  that the port was in access mode was creating the problem as apparently the router had no subinterfaces configured.

Can you explain what obvious stuff i've missed here.

Alain.

Don't forget to rate helpful posts.

You've missed the reply below It saying that I accidentally clicked the correct answer button !

It wasn't the correct answer , I still need help! I've posted the interface status for switch and router In the previous posts.

so if you connect a PC or another router to this switch port it is ok?

Alain.

Don't forget to rate helpful posts.

Hi,

Could you use and re-configure your router's FE0/1 and use another switch port?

Sent from Cisco Technical Support iPhone App

Lol. No it's not the coffee I did replicate OP's setup in PT with no issue. I suspect a port or HW problem.

Sent from Cisco Technical Support iPhone App

Hi.The thing Is all the ports on the switch work when connected to another switch or to a pc.The router fa0/0 also works when connected to a small tp-link switch or to a pc.

Hi,

Can you try forcing speed and duplex settings to 100-full on both sides.

Alain.

Don't forget to rate helpful posts.