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cisco 876, ping failure between default vlan and access vlan

strmarinos
Level 1
Level 1

Hi all on my lab I have a cisco 876 with, c870-adventerprisek9-mz.124-6.T9.bin.

I have configured a VLAN with ID 230, an SVI with IP 192.168.230.1/24 and I have assigned switch port fa 2 to it…

interface Vlan230

ip address 192.168.230.1 255.255.255.0

  VLAN ISL Id: 230

    Name: testDHCPvlan

    Media Type: Ethernet

    VLAN 802.10 Id: 100230

    State: Operational

    MTU: 1500

sh int fastEthernet 2 switchport

Name: Fa2

Switchport: Enabled

Administrative Mode: static access

Operational Mode: static access

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: native

Negotiation of Trunking: Disabled

Access Mode VLAN: 230 (testDHCPvlan)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Trunking VLANs Active: 230

Protected: false

Priority for untagged frames: 0

Override vlan tag priority: FALSE

Voice VLAN: none

Appliance trust: none

On int fast 1 on vlan 1 i have given an IP 192.168.82.1 /24

As you can see I have connectivity

sh ip ro

C    192.168.230.0/24 is directly connected, Vlan230

C    192.168.82.0/24 is directly connected, Vlan1

#ping 192.168.230.3 source vlan 230

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.230.3, timeout is 2 seconds:

Packet sent with a source address of 192.168.230.1

!!!!!

BUT

If I ping  hosts on vlan 230 from hosts on VLAN 1…

Router#ping 192.168.230.3 source vlan 1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.230.3, timeout is 2 seconds:

Packet sent with a source address of 192.168.82.1

.....

Success rate is 0 percent (0/5)

WHY is this happening? Could somebody explain me?

i am supposed to have full conectivity between vlans (no Access lists or FW)

Thank you in advance

Stratos

5 Replies 5

kcnajaf
Level 7
Level 7

Hi Stratos,

You have mentioned that "On int fast 1 on vlan 1 i have given an IP 192.168.82.1 /24". Do you have any device connected to this port?

Could you please provide output of below commands?

show ip int brief

show vlan-switch

Regards

Najaf

Please rate when applicable or helpful !!!

Jan Rolny
Level 3
Level 3

Hi,

becasue sh ip route shows that routes ar connected so it seems that vlan interfaces are UP.

Please check your configuration. Below is part of configuration which works fine. It should ping no problem.

Please also double-check that your PC's has correct default GW,IP and netmask configured.

!

interface FastEthernet0/0/0

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/0/1

switchport access vlan 230

switchport mode access

spanning-tree portfast

!

!

interface Vlan1

ip address 192.168.82.1 255.255.255.0

!

interface Vlan230

ip address 192.168.230.1 255.255.255.0

!

Regards,

Jan

Well here is my Vlan configuration

  VLAN ISL Id: 1

    Name: default

    Media Type: Ethernet

    VLAN 802.10 Id: 100001

    State: Operational

    MTU: 1500

    Translational Bridged VLAN: 1002

    Translational Bridged VLAN: 1003

  VLAN ISL Id: 230

    Name: testDHCPvlan

    Media Type: Ethernet

    VLAN 802.10 Id: 100230

    State: Operational

    MTU: 1500

int Vlan are up up...

Jan i know that this is the congiguration that works, BUT why it doesnt work on 876?

PC on VLAN 230 is takes IP from DHCP on my Router...my PC configuration are fine...no FW enabled...Besides i can ping pc from the Router with its VLAN as source...

thank you 

Hi Stratos,

Do you have any PC on VLAN1? If not could you please move exisisting PC to VLAN 1 and assign 192.168.82.x ip address and verify if you are able to ping VLAN1's gatewway (192.168.82.1) from this PC?

Also could you please share the interface configuration on this device?

Regards

Najaf

Please rate when applicable or helpful !!!

Hello,

why you are pinging so coplicated? As Najaf stated please ping VLAN1 interface(gw) from PC which is connected to VLAN1 and then ping VLAN230 interface(gw) from PC connected to VLAN230.

Also please post whole configuration of router to better investigate where could be problem.

Thanks.

Best regards,

Jan

Review Cisco Networking for a $25 gift card