Router on a stick issues

Im not sure why its doing this. but im just finishing up a config with router on a stick between native vlan 1 and vlan 100. i have also setup a eigrp config on the ethernet segment which is in vlan 1. all the eigrp neibours complete adjencys with the "router on a stick's" subinterface f0/0.1 which is on vlan 1 and so is the rest of that ethernet segment. I have a 1760 voice router which i wish to place on vlan 100 for voice services. but the router on a stick nor the 1760 router ping then other.

Router on a sick: FastEthernet 0/0.1 - VLAN1 - 10.10.5.1
FastEthernet 0/0.100 - VLAN1 10.100.0.1

all the other routers and switches and hosts in the 10.10.5.0/24 subnet on vlan 1 and can ping 10.100.0.1 but the 1760 cannot

is there something im missing

ill post the configs when i get back to the lab

Thanks in advance!!

Find more posts tagged with

Comments

Bl8ckr0uter

optixgate wrote: »

Im not sure why its doing this. but im just finishing up a config with router on a stick between native vlan 1 and vlan 100. i have also setup a eigrp config on the ethernet segment which is in vlan 1. all the eigrp neibours complete adjencys with the "router on a stick's" subinterface f0/0.1 which is on vlan 1 and so is the rest of that ethernet segment. I have a 1760 voice router which i wish to place on vlan 100 for voice services. but the router on a stick nor the 1760 router ping then other.

Router on a sick: FastEthernet 0/0.1 - VLAN1 - 10.10.5.1
FastEthernet 0/0.100 - VLAN1 10.100.0.1

all the other routers and switches and hosts in the 10.10.5.0/24 subnet on vlan 1 and can ping 10.100.0.1 but the 1760 cannot

is there something im missing

ill post the configs when i get back to the lab

Thanks in advance!!

Post your configs, Im interested to see if I can help

Xenz

Can you post an MS Paint picture of your topology?

The description of your topology is too vague. The configs would be nice. I will be honest and say I don't have very much experience with this, but my questions would be:

Trunking setup? Didn't change the native VLAN by accident? Encapsulation mismatch?

Hopefully someone with voice experience can give you some better feedback.

thenjduke

Please post configs and topolgy of this. We like to help but like others have said information is too vague.

networker050184

Just a guess, but did you add VLAN 100 to the VLAN database on the switch?

kryolla

FastEthernet 0/0.100 - VLAN1 10.100.0.1

Im assuming you meant this to say vlan 100. Is the port connected to 1760 configured for vlan 100?

miller811

did you remove the ip address from interface f0/0?

optixgate

Ok i got my configs

heres the FastEthernet 0/0 portion on the "router on a stick"

interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.1
encapsulation dot1Q 1 native
ip address 10.10.5.3 255.255.255.0
!
interface FastEthernet0/0.100
encapsulation dot1Q 100
ip address 10.100.0.1 255.255.255.0
!

Here is a "show vlan brief" on the switch that both the router on a stick and the voice router are on

SW3#show vlan br

VLAN Name Status Ports
----

1 default active Fa0/2, 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
100 VOICE_VLAN active Fa0/1
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
SW3#

I also have vtp running so all other switches in the network can identify vlan 100

C3524-PWR#show vlan br
VLAN Name Status Ports
----

1 default active Fa0/19, Fa0/20, Fa0/21, Fa0/22,
Fa0/23, Fa0/24, Gi0/1, Gi0/2
100 VOICE_VLAN active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
C3524-PWR#

and then the config for the voice router

interface FastEthernet0/0
ip address 10.100.0.2 255.255.255.0
speed auto
!
ip default-gateway 10.100.0.1

all the other routers can ping the subinterface (10.100.0.1) but the voice router cannot

optixgate

kryolla wrote: »

Im assuming you meant this to say vlan 100. Is the port connected to 1760 configured for vlan 100?

yes sorry i did mean to say vlan 100.

wastedtime

How are they physically connected to each other? For example fa0/1 on switch so and so is connected to fa0/1 on this switch.

Edit: A diagram, even a simple one would be nice and can we have the configs of the switches too. Am I to assume that everything else is default?

mikej412

optixgate wrote: »

C3524-PWR#show vlan br
VLAN Name Status Ports
----
1 default active Fa0/19, Fa0/20, Fa0/21, Fa0/22,
Fa0/23, Fa0/24, Gi0/1, Gi0/2
100 VOICE_VLAN active

Shouldn't there be a port using VLAN 100 if you have the 1760 in VLAN 100?

wastedtime

I was wondering if he was using fa0/1 on SW3

optixgate

wastedtime wrote: »

I was wondering if he was using fa0/1 on SW3

yes f0/1 which is connected to my 1760 voice router is in vlan 100

optixgate

mikej412 wrote: »

Shouldn't there be a port using VLAN 100 if you have the 1760 in VLAN 100?

yeah thats just the VTP . the actual VLAN 100 was created on SW3 and does have f0/1 assigned to vlan 100.

optixgate

OK HERES ALL THE CONFIGS MY FRIENDS

ROUTER ON A STICK CONFIG

interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.1
encapsulation dot1Q 1 native
ip address 10.10.5.3 255.255.255.0
!
interface FastEthernet0/0.100
encapsulation dot1Q 100
ip address 10.100.0.1 255.255.255.0
!
interface BRI0/0
no ip address
encapsulation hdlc
shutdown
!
interface Serial0/0
ip address 172.12.1.3 255.255.255.0
encapsulation frame-relay
ip ospf network broadcast
no fair-queue
frame-relay lmi-type ansi
!
router eigrp 1
network 10.10.5.0 0.0.0.255
auto-summary
!
router ospf 1
log-adjacency-changes
network 172.12.1.0 0.0.0.255 area 0
!
ip http server
no ip http secure-server
ip classless
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
exec-timeout 0 0
logging synchronous
login local
!
!
end

R3#

CONFIG ON SWITCH 3 WHICH HAS 1 PORT IN VLAN 100

interface Port-channel3
switchport mode trunk
flowcontrol send off
!
interface FastEthernet0/1
description VLAN 100 FOR VOICE
switchport access vlan 100
switchport voice vlan 100
spanning-tree portfast
!
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
switchport mode trunk
channel-group 3 mode on
!
interface FastEthernet0/18
switchport mode trunk
channel-group 3 mode on
!
interface FastEthernet0/19
switchport mode trunk
channel-group 3 mode on
!
interface FastEthernet0/20
switchport mode trunk
channel-group 3 mode on
!
interface FastEthernet0/21
switchport mode trunk
channel-group 3 mode on
!
interface FastEthernet0/22
switchport mode trunk
channel-group 3 mode on
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface Vlan1
ip address 10.10.5.23 255.255.255.0
no ip route-cache
!
interface Vlan100
no ip address
no ip route-cache
shutdown
!
ip http server
!
line con 0
line vty 0 4
exec-timeout 0 0
logging synchronous
login local
line vty 5 15
login
!
!
end

SW3#

CONFIG FOR THE 1760 VOICE ROUTER

interface FastEthernet0/0
ip address 10.100.0.2 255.255.255.0
speed auto
!
ip default-gateway 10.100.0.1
ip forward-protocol nd
!
ip http server
ip http authentication local
no ip http secure-server
ip http path flash:/gui
!
!
control-plane
!
!
!
voice-port 2/0
shutdown
!
voice-port 2/1
shutdown
!
voice-port 3/0
shutdown
!
voice-port 3/1
shutdown
!
!

need any more configs.

networker050184

On the trunk that is set up to the router do you have the encapsulation set to dot1q? It looks like you are using some older switches that will default to ISL.

Also you will want to use the ip route 0.0.0.0 0.0.0 command instead of the ip default-gateway command for your default route.

optixgate

networker050184 wrote: »

On the trunk that is set up to the router do you have the encapsulation set to dot1q? It looks like you are using some older switches that will default to ISL.

Also you will want to use the ip route 0.0.0.0 0.0.0 command instead of the ip default-gateway command for your default route.

All the switches are using dot1q. i have 3 2950 which only use dot1q and a 3524 which i have set to use dot1q

1760-CME(config)#no ip default-gateway
1760-CME(config)#ip route 0.0.0.0 0.0.0.0 fastEthernet 0/0
1760-CME(config)#^Z
1760-CME#ping 10.100.0.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.100.0.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

1760-CME#ping 10.100.0.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.100.0.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
1760-CME#

it can obviously ping itself but not the R3 sub-interface 10.100.0.1

networker050184

Time for some kind of diagram here.

Something else to check would be the allowed VLANs on the trunk links.

kryolla

follow the MAC address of the 1760 router and see which switch does it stop at. First deb ip icmp on the ROI and see if it is receiving the pings if not then follow the MAC address of 1760 i.e on 1760 do a sh int fa0/0 this will give you the MAC add then go to the directly connected switch and sh mac address-table dynamic and look for the port that is connected to the 1760 which will give you the MAC of the 1760 and vlan 100 then go to the next switch and it should point to the trunk link with vlan 100 and so on and so on until you hit ROI. On the ROI type sh arp and see if the MAC add is there and is pointing out the sub-int for vlan 100

optixgate

kryolla wrote: »

follow the MAC address of the 1760 router and see which switch does it stop at. First deb ip icmp on the ROI and see if it is receiving the pings if not then follow the MAC address of 1760 i.e on 1760 do a sh int fa0/0 this will give you the MAC add then go to the directly connected switch and sh mac address-table dynamic and look for the port that is connected to the 1760 which will give you the MAC of the 1760 and vlan 100 then go to the next switch and it should point to the trunk link with vlan 100 and so on and so on until you hit ROI. On the ROI type sh arp and see if the MAC add is there and is pointing out the sub-int for vlan 100

HERE IS THE SHOW ARP ON THE ROUTER ON A STICK
R3#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.10.5.1 0 0011.bb19.2160 ARPA FastEthernet0/0.1
Internet 10.10.5.3 - 0007.ebce.31a0 ARPA FastEthernet0/0.1
Internet 10.10.5.23 1 000c.ce87.7380 ARPA FastEthernet0/0.1
Internet 10.100.0.1 - 0007.ebce.31a0 ARPA FastEthernet0/0.100
R3#

HERE IS THE MAC ADDRESS TABLE ON THE DIRECTLY CONNECTED SWITCH
1 0007.0e96.ce00 DYNAMIC Po3
1 0009.43ba.f540 DYNAMIC Po3
1 0009.43ba.f54d DYNAMIC Po3
1 0010.7be0.83c0 DYNAMIC Po3
1 0011.bb19.2160 DYNAMIC Po3
1 0012.80b3.b650 DYNAMIC Fa0/23
1 0012.80b3.e950 DYNAMIC Fa0/24
1 0022.b068.5779 DYNAMIC Po3
100 0013.8063.fe41 DYNAMIC Fa0/1

optixgate

FIRST OFF, I AM SORRY

I figured out the problem. The swicth port that is connected to the router on a stick HAS TO BE TRUNKING. I forgot the "switchport mode trunk" command on the ROAS switch port!!!!!

after finishing up that command. i have 100% connectivity via 10.10.0.0 subnet and 10.100.0.0 subnet and connectivity from vlan1 - vlan 100

Thanks for eveyones help.

Xenz

Xenz wrote: »

Trunking setup? Didn't change the native VLAN by accident? Encapsulation mismatch?

woot!

At least you'll know to look for it now. I was making this mistake a bit when learning RoAS