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[Troubleshooting Series]Case 11 PC of the same network segment cannot Ping Highlighted

Created: Dec 10, 2018 01:18:02Latest reply: Dec 27, 2018 07:52:20 779 4 1 0 1

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PC of the same network segment cannot Ping

Network Topology

Physical Network Topology

Fault Description

SW0 cannot ping the IP of Vlanif101 of SW1. You need solve the issue without changing the IP address, because the customer does not allow to change of the IP address.

Configuration Files

SW0:
#
interface Vlanif100
ip address 10.122.0.184 255.255.254.0
#
interface GigabitEthernet0/0/1
port link-type access
port default vlan 100
#
SW1:
#
interface Vlanif101
ip address 10.122.1.10 255.255.255.0
#
interface GigabitEthernet0/0/1
port link-type access
port default vlan 101
#
Core Switch:
#
interface Vlanif100
ip address 10.122.0.1 255.255.255.0
#
interface Vlanif101
ip address 10.122.1.1 255.255.255.0
#
interface GigabitEthernet0/0/1
port link-type access
port default vlan 100
#
interface GigabitEthernet0/0/2
port link-type access
port default vlan 101
#

Troubleshooting Location

Troubleshooting Procedure

Step 1 The IP address of Vlanif101 of SW1 and Vlanif100 of SW0 are in the same network segment. The ARP request message is broadcast and can not be transmitted across the VLAN to the SW1. Therefore, SW1 can not learn ARP, which leads to Ping failure.

Step 2 Enable the ARP proxy function.

[CoreSwitch-Vlanif100] arp-proxy enable

Root Cause

The IP address of Vlanif101 of SW1 and Vlanif100 of SW0 are in the same network segment. The ARP request message is broadcast and can not be transmitted across the VLAN to the SW1. Therefore, SW1 can not learn ARP, which leads to Ping failure.

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EdeninRealMadrid Created Dec 12, 2018 09:29:18

Its useful

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sim_157 Created Dec 18, 2018 03:25:42

I used to encountered the same failure, but with the other fault caused, maybe I should sharing that case .

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Finn92

Created Dec 18, 2018 06:58:23

wow , thank you author , it's a good sharing for ARP proxy .

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dagui

Created Dec 27, 2018 07:52:20

The IP address of Vlanif101 of SW1 and Vlanif100 of SW0 are in the same network segment.How do you understand this sentence?

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