question about ping and arp in MLS

[Dr.X]

HI , i have the topology below :

as we see all the L2 links are trunk ,

ive created vlan 10 with svi as in figure

note that on R1 i have ip 192.168.1.4/24 as siv interface

uptill now i didnt configure L3 interfaces . i mean i just configured  the green circuile in the figure

but i have problem

why when i try to ping 192.168.1.3  from from R1 it fail ????

but if i put ip on svi  on vlan 1

every thing is okay !!!

my question is another point .

if i changed vlan 10 to vlan 1  with the same ips , every thing is ok

whats wrong with me ??

[Nagendra Kumar Nainar]

Hi,

Simplifying your topology for better understanding,

(vlan10)R2(E0/3)-----L2--------(E0/3)R1(Vlan10)

You have 192.168.1.3/24 on R1 vlan 10 and 192.168.1.3/24 on R2 vlan 10. When you ping from R1, it fails. Is my assumption right on above simplified topology?.

Am I assuming right that you have E0/3 on both R1 and R2 as trunk interface?. if so, what is the native vlan you have enabled on R1 and R2?.

Do you mena, when you move the IP address on both R1 and R2 to vlan1, it works?.

-Nagendra

[Dr.X]

hi 

-Nagendra ,

its as u said . but samll correct

(vlan10)R2(E0/3)-----L2--------(E0/3)R1(Vlan10)

You have 192.168.1.4/24 on R1 vlan 10 and 192.168.1.3/24 on R2 vlan 10.

native vlan is vlan 1

when changing the  the vlan 10  to vlan 1 , its okay !!

but why the ping & arp request go through native vlan ??

regards

[Nagendra Kumar Nainar]

Hi,

Can you share the configuration from R1 and R2?. I hope you have vlan 10 created on both R1 and R2.

-Nagendra

[Dr.X]

SW1#sh run

Building configuration...

Current configuration : 1212 bytes

!

! Last configuration change at 11:33:40 EST Mon Jan 7 2013

!

version 12.2

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname SW1

!

boot-start-marker

boot-end-marker

!

!

!

no aaa new-model

clock timezone EST -5

!

ip cef

!

no ipv6 traffic interface-statistics

no ipv6 cef

!

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

!

!

!

!

!

interface Ethernet0/0

switchport

switchport trunk encapsulation isl

switchport mode trunk

duplex auto

!

interface Ethernet0/1

switchport

switchport trunk encapsulation isl

switchport mode trunk

duplex auto

!

interface Ethernet0/2

switchport

switchport access vlan 10

switchport mode access

shutdown

duplex auto

spanning-tree portfast edge

!

interface Ethernet0/3

switchport

switchport trunk encapsulation isl

switchport mode trunk

duplex auto

!

interface Vlan1

ip address 1.1.1.5 255.255.255.0

!

interface Vlan10

ip address 192.168.1.4 255.255.255.0

!        

!

no ip http server

!

!

!

!

!

control-plane

!

!

line con 0

logging synchronous

line aux 0

line vty 0 4

login

transport input all

!

exception data-corruption buffer truncate

end

============================

SW2#sh run

Building configuration...

Current configuration : 1055 bytes

!

! Last configuration change at 11:33:05 EST Mon Jan 7 2013

!

version 12.2

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname SW2

!

boot-start-marker

boot-end-marker

!

!

!

no aaa new-model

clock timezone EST -5

!

ip cef

!

no ipv6 traffic interface-statistics

no ipv6 cef

!

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

!

!

!

!

!

interface Ethernet0/0

no ip address

shutdown

duplex auto

!

interface Ethernet0/1

ip address 10.20.30.2 255.255.255.0

duplex auto

!        

interface Ethernet0/2

no ip address

shutdown

duplex auto

!

interface Ethernet0/3

switchport

switchport trunk encapsulation isl

switchport mode trunk

duplex auto

!

interface Vlan1

ip address 1.1.1.6 255.255.255.0

!

interface Vlan10

ip address 192.168.1.3 255.255.255.0

!

!

no ip http server

!

!

!

!        

!

control-plane

!

!

line con 0

logging synchronous

line aux 0

line vty 0 4

login

transport input all

!

exception data-corruption buffer truncate

end

[Nagendra Kumar Nainar]

Hi,

You dont seems to have the vlan created. Can you try the below,

config t

vlan 10

exit

-Nagendra

[Dr.X]

hi ,

its created because it was transferred by vtp ,

anyway i did as u suggested but the same issue !!!

no ping

[Dr.X]

hi , im wondering about an issue.

i think when i ping from MLS , the traffic is originated from switch and seems to be untagged and will go to vlan 1 ,

so i cant ping other switches in vlans not from vlan 1  >

is my pointview may be correct ?

regards