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January 3rd, 2021 09:00

Destination host unreachable

Hi, This is Dell OS10 switches configured with VLAN and VRRP. I have been troubleshooting this for hours and will be grateful for some some advise here...

Example:

Switch A - VLAN (100), IP:192.168.1.1, VRRP:192.168.1.3

Switch B - VLAN (100), IP:192.168.1.2

1.On both switches, I can ping both VLAN IP and the VRRP IP addresses vice-versa which is good.

2. But on the server end, I can only ping Switch A VLAN IP 192.168.1.1 and VRRP IP 192.168.1.3. Pinging Switch B VLAN IP 192.168.1.2 will returned "destination host unreachable" error.

3. When I swing VVRP IP to Switch B, i still unable to ping 192.168.1.2 and also the VRRP IP 192.168.1.3. Anything else that i might overlooked?

Thanks much!

Moderator

 • 

3.4K Posts

January 4th, 2021 05:00

Hello,

thanks for using this forum.

To better understand the configuration, can you paste a show running config and show vrrp brief for both switch?

And IP and OS of the server NIC.

Thanks

Marco

January 7th, 2021 09:00

Hi,

Thank you for responding. Please kindly see below... 

 

# Switch A Configuration

interface vlan110
description Management
no shutdown
ip address 192.168.1.1/24
!
vrrp-group 110
virtual-address 192.168.1.3

Interface Group Priority Prempt State Version Master addr(s) Virtual addr
---------------------------------------------------------------------------------------------------------------------
vlan110 IPv4 110 100 true master-state 2 192.168.1.1 192.168.1.3


# Switch B Configuration

interface vlan110
description Management
no shutdown
ip address 192.168.1.2/24
!
vrrp-group 110
priority 50
virtual-address 192.168.1.3


Interface Group Priority Prempt State Version Master addr(s) Virtual addr
---------------------------------------------------------------------------------------------------------------------
vlan110 IPv4 110 50 true backup-state 2 192.168.1.2 192.168.1.3

 

# Server IP Configuration
Ethernet adapter vEthernet (vManagement-110):

Connection-specific DNS Suffix . : xxxxx.xxx.int
IPv4 Address. . . . . . . . . . . : 192.168.1.50
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.3

Moderator

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8.5K Posts

January 7th, 2021 10:00

Which switch is this? What version of OS are you using? Which switch is the test server connected to? the VRRP looks fine there. 

January 7th, 2021 10:00

Hi,

Both switches are S4128F-ON. 

OS Version: 10.5.2.0
Build Version: 10.5.2.0.232
Build Time: 2020-09-24T18:40:26+0000
System Type: S4128F-ON
Architecture: x86_64

 

The server is connected to both switches. Below is port-channel config which is same for both switches.

--------------------------------------------------------------------------------
Group Port-Channel Type Protocol Member Ports
--------------------------------------------------------------------------------
10 port-channel10 (U) Eth DYNAMIC 1/1/3(P) 1/1/5(P)
11 port-channel11 (U) Eth DYNAMIC 1/1/4(P) 1/1/6(P)

 

I also confirmed the line protocol is up for both switches

# show interface port-channel 10
Port-channel 10 is up, line protocol is up
Address is 68:4f:64:e7:37:2c, Current address is 68:4f:64:e7:37:2c
Interface index is 47
Internet address is not set
Mode of IPv4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 20G

# show interface port-channel 11
Port-channel 11 is up, line protocol is up
Address is 68:4f:64:e7:37:2d, Current address is 68:4f:64:e7:37:2d
Interface index is 49
Internet address is not set
Mode of IPv4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 20G

 

If switches config are ok.. then i stop looking at switch config, will check the OS side, maybe is the ethernet adapter issue.

 

Thanks

 

Moderator

 • 

3.4K Posts

January 8th, 2021 07:00

Hello,

I don't see nothing wrong at first glance but the switch at the hardware level seems ok, i would check on the configuration of VLAN and yes at the OS side. Try also to cross checking ports.

Unfortunately we cannot troubleshoot the configuration as it is fee paying.

Have a good day.

Marco

 

January 8th, 2021 22:00

Thanks Marco! Appreciate your input.

 

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