Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Routing over a trunk

I have a packet tracer lab that i am using to learn my CCNA on. 

I have 2 sites connected together by layer 3 switches and i cannot ping between the sites. 

 

The trunk is vlan10 with addresses on each side of 1.1.1.1/30 and 1.1.1.2/30

From each switch i can ping the other side.  

I have some machines on 192.168.100.0/24 in Vlan 20

and machines on the other switch on 10.0.10.0/25 Vlan 30

 

From Vlan20 i can ping the local side of Vlan 10 and the same from Vlan 30 but i cant ping over the trunk. 

 

Can anyone give me a hint as to why not?

 

SWITCH 1

version 12.2

no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname ScunthorpeSwitch
!
!
!
enable secret 5 *****
!
!
!
ip routing
!

!
interface FastEthernet0/1
!
interface FastEthernet0/2
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/3
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/24
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport mode trunk
!

interface Vlan1
 no ip address
!
interface Vlan10
 ip address 1.1.1.2 255.255.255.252
!
interface Vlan30
 ip address 10.0.10.253 255.255.255.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/24 
!

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/1, Fa0/4, Fa0/5, Fa0/6
                                                Fa0/7, Fa0/8, Fa0/9, Fa0/10
                                                Fa0/11, Fa0/12, Fa0/13, Fa0/14
                                                Fa0/15, Fa0/16, Fa0/17, Fa0/18
                                                Fa0/19, Fa0/20, Fa0/21, Fa0/22
                                                Fa0/23, Gig0/1, Gig0/2
10   FIRBELINK                        active    
20   SHEFFIELD                        active    Fa0/2
30   SCUNTHORPE                       active    Fa0/3
40   SERVERS                          active    
1002 fddi-default                     act/unsup 

 

ScunthorpeSwitch#sho interfaces trunk 
Port        Mode         Encapsulation  Status        Native vlan
Fa0/24      on           802.1q         trunking      1

Port        Vlans allowed on trunk
Fa0/24      1-1005

Port        Vlans allowed and active in management domain
Fa0/24      1,10,20,30,40

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/24      1,10,20,30,40

 

SWITCH 2

version 12.2

no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname "Sheffield Switch"
!
!
!
enable secret 5 **************
!
!
!
ip routing
!

username ***** password 0 ********
!

!
no ip domain-lookup

!
interface FastEthernet0/1
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/2
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/3
 switchport mode access
 shutdown

!
interface FastEthernet0/24
 description FIBER BETWEEN SITES
 no switchport
 no ip address
 duplex auto
 speed auto
!
!
interface Vlan1
 no ip address
!
interface Vlan10
 ip address 1.1.1.1 255.255.255.252
!
interface Vlan20
 ip address 192.168.100.250 255.255.255.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/24 
!
!
!
banner motd ^C
******* , Do Not Enter ******   ^C
 

 

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/3, Fa0/4, Fa0/5, Fa0/6
                                                Fa0/7, Fa0/8, Fa0/9, Fa0/10
                                                Fa0/11, Fa0/12, Fa0/13, Fa0/14
                                                Fa0/15, Fa0/16, Fa0/17, Fa0/18
                                                Fa0/19, Fa0/20, Fa0/21, Fa0/22
                                                Fa0/23, Gig0/1, Gig0/2
10   FIRBELINK                        active    
20   SHEFFIELD                        active    Fa0/1, Fa0/2
30   SCUNTHORPE                       active    
40   SERVERS                          active    

 

 

Sheffield Switch#sho interfaces trunk 
Port        Mode         Encapsulation  Status        Native vlan
Fa0/24      on           802.1q         trunking      1

Port        Vlans allowed on trunk
Fa0/24      1-1005

Port        Vlans allowed and active in management domain
Fa0/24      1,10,20,30,40

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/24      1

Everyone's tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Silver

You have no routing protocol

You have no routing protocol running so the L3 switches only know about connected and static routes. The only static route you have is the default:

     ip route 0.0.0.0 0.0.0.0 FastEthernet0/24

The interface you tell it to use is a L2 interface, so you're effectively not routing with that default. If you create an SVI (Layer 3 switched virtual interface) for each VLAN on all the switches (i.e. add interfaces for VLAN 20 on switch 1 and VLAN 30 on switch 2), it will work. also if you made the default route on each switch be the other switch's VLAN 10 L3 interface, that would also work.

You could also setup actual routing like OSPF or EIGRP but that's outside the scope for CCNA practice.

2 REPLIES
Hall of Fame Super Silver

You have no routing protocol

You have no routing protocol running so the L3 switches only know about connected and static routes. The only static route you have is the default:

     ip route 0.0.0.0 0.0.0.0 FastEthernet0/24

The interface you tell it to use is a L2 interface, so you're effectively not routing with that default. If you create an SVI (Layer 3 switched virtual interface) for each VLAN on all the switches (i.e. add interfaces for VLAN 20 on switch 1 and VLAN 30 on switch 2), it will work. also if you made the default route on each switch be the other switch's VLAN 10 L3 interface, that would also work.

You could also setup actual routing like OSPF or EIGRP but that's outside the scope for CCNA practice.

New Member

HI Marvin,  I tried both

HI Marvin,  I tried both methods out and they both work.  I may have made my switches VTP transparent earlier on.  I guess if I didnt then this problem wouldn't have occurred as all the Vlans would be in place?

 

Actually I believe that EIGRP and OSPF are both on the new CCNA, but I wont come through to that module for another couple of weeks.  

 

Thanks for your help.

Patrick

461
Views
0
Helpful
2
Replies