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L3 Inter-VLAN Routing

Posted on 2014-03-17
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Last Modified: 2014-03-27
This should be a simple one.  I have a 3750 setup as a L3 switch. I have two VLANs.

VLAN 20 and 132.

While logged into the switch I can ping devices on VLAN 20 and VLAN 132.  From a computer on VLAN 132, I cannot ping a computer on VLAN 20 and vice versa.

A computer on VLAN 132 can ping the VLAN 20 gateway 192.168.90.254.  
A computer on VLAN 20 can ping the VLAN 132 gateway 172.16.132.9.

What am I missing here?

no aaa new-model
switch 1 provision ws-c3750g-48ts
system mtu routing 1500
vtp mode transparent
authentication mac-move permit
ip subnet-zero
ip routing
no ip domain-lookup
!
!
spanning-tree mode pvst
spanning-tree etherchannel guard misconfig
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 10
 name CX_SPCI
!
vlan 20
 name CX_WEBDMZ
!
vlan 30
 name CX_UTILITY
!
vlan 40
 name CX_ROUTER_DMZ
!
vlan 50
 name CX_APPLICATION
!
vlan 60
 name CX_DEV
!
vlan 70
 name CX_CORPORATE
!
vlan 105
 name CX_ISCSI
!
vlan 124
 name M_DMZ
!
vlan 125
 name M_TRUST
!
vlan 131
 name VMOTION
!
vlan 132
 name MGMT
!
vlan 330,332,334,336,338,340,342,344,346,348,350,352,354,356
!
vlan 358
 name Tehama
!
ip ssh time-out 60
ip ssh version 2
!
!
interface Port-channel1
 description "LACP (E) Trunk to VRTX"
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface Port-channel2
 description "LACP (M) Trunk to VRTX"
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface Port-channel3
 description "LACP (CX) Trunk to VRTX"
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface Port-channel4
 description "LACP (E) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface Port-channel5
 description "LACP (M) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface Port-channel6
 description "LACP (CX) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet1/0/1
 description "VRTX (E) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/2
 description "VRTX (E) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/3
 description "VRTX (E) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/4
 description "VRTX (E) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/5
 description "LACP (E) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 4 mode active
!
interface GigabitEthernet1/0/6
 description "LACP (E) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 4 mode active
!
interface GigabitEthernet1/0/7
 description "LACP (E) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 4 mode active
!
interface GigabitEthernet1/0/8
 description "LACP (E) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 4 mode active
!
interface GigabitEthernet1/0/9
!
interface GigabitEthernet1/0/10
!
interface GigabitEthernet1/0/11
!
interface GigabitEthernet1/0/12
!
interface GigabitEthernet1/0/13
!
interface GigabitEthernet1/0/14
!
interface GigabitEthernet1/0/15
 description "CMC (E)"
 switchport access vlan 132
 switchport mode access
!
interface GigabitEthernet1/0/16
!
interface GigabitEthernet1/0/17
 description "VRTX (M) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 2 mode active
!
interface GigabitEthernet1/0/18
 description "VRTX (M) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 2 mode active
!
interface GigabitEthernet1/0/19
 description "VRTX (M) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 2 mode active
!
interface GigabitEthernet1/0/20
 description "VRTX (M) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 2 mode active
!
interface GigabitEthernet1/0/21
 description "LACP (M) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet1/0/22
 description "LACP (M) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 5 mode active
!
interface GigabitEthernet1/0/23
 description "LACP (M) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 5 mode active
!
interface GigabitEthernet1/0/24
 description "LACP (M) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 5 mode active
!
interface GigabitEthernet1/0/25
!
interface GigabitEthernet1/0/26
!
interface GigabitEthernet1/0/27
!
interface GigabitEthernet1/0/28
!
interface GigabitEthernet1/0/29
!
interface GigabitEthernet1/0/30
!
interface GigabitEthernet1/0/31
 description "CMC (MPAY)"
 switchport access vlan 132
 switchport mode access
!
interface GigabitEthernet1/0/32
!
interface GigabitEthernet1/0/33
 description "VRTX (CX) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 3 mode active
!
interface GigabitEthernet1/0/34
 description "VRTX (CX) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 3 mode active
!
interface GigabitEthernet1/0/35
 description "VRTX (CX) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 3 mode active
!
interface GigabitEthernet1/0/36
 description "VRTX (CX) Trunk"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 3 mode active
!
interface GigabitEthernet1/0/37
 description "LACP (CX) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 6 mode active
!
interface GigabitEthernet1/0/38
 description "LACP (CX) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 6 mode active
!
interface GigabitEthernet1/0/39
 description "LACP (CX) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 6 mode active
!
interface GigabitEthernet1/0/40
 description "LACP (CX) Uplink"
 switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 6 mode active
!
interface GigabitEthernet1/0/41
!
interface GigabitEthernet1/0/42
!
interface GigabitEthernet1/0/43
!
interface GigabitEthernet1/0/44
!
interface GigabitEthernet1/0/45
!
interface GigabitEthernet1/0/46
!
interface GigabitEthernet1/0/47
 description "CMC (CX)"
 switchport access vlan 132
 switchport mode access
!
interface GigabitEthernet1/0/48
 switchport access vlan 132
 switchport mode access
!
interface GigabitEthernet1/0/49
!
interface GigabitEthernet1/0/50
!
interface GigabitEthernet1/0/51
!
interface GigabitEthernet1/0/52
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan10
 ip address 192.168.116.190 255.255.255.0
!
interface Vlan20
 ip address 192.168.90.254 255.255.255.0
!
interface Vlan132
 ip address 172.16.132.9 255.255.255.0
!
interface Vlan358
 ip address 10.2.58.253 255.255.255.0
!
ip default-gateway 172.16.132.1
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.132.1
ip route 10.2.58.0 255.255.255.0 172.16.1.254
ip route 192.168.116.0 255.255.255.0 192.168.116.129
ip http server
ip http secure-server
!
ip sla enable reaction-alerts
0
Comment
Question by:lconnell
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5 Comments
 
LVL 45

Accepted Solution

by:
Craig Beck earned 500 total points
ID: 39936644
Each PC needs to use the switch as its default gateway, so a PC using 192.168.90.100 needs to use 192.168.90.254 as its default gateway, and the PC using 172.16.132.100 needs to use 172.16.132.9 as its default gateway.

Machines on each VLAN need to use a gateway or they won't be able to send or receive traffic from other VLANs.

For example, if you configure a default gateway on a PC on VLAN20, and try to ping a device on VLAN132 which doesn't have a default gateway configured, the ping will fail.
0
 

Author Comment

by:lconnell
ID: 39936856
Doh!! I knew that.  I had the 172.16.132.0 network using a different gateway!! 172.16.132.1 instead of .9.

Thank you!
0
 
LVL 45

Expert Comment

by:Craig Beck
ID: 39937607
:-)
0
 

Author Comment

by:lconnell
ID: 39960725
Can I tag you in my new questions so you always know when I post? lol
0
 

Author Comment

by:lconnell
ID: 39960750
0

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