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Core ping fails to reach access switch gateway

Fiber and communications infrastructure knowledge brief Published 17 Jan 2023

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

The core switch failing to ping the access switch gateway is usually caused by routing, VLAN, or interface misconfigurations between the core and access switches. Common Causes1. Default Gateway Misconfiguration If the access switch does not have a proper default gateway configured, it cannot route traffic back to the core switch.

Ensure the access switch has a ip default-gateway statement pointing to the core switch or Layer 3 gateway. 2.

VLAN or Trunk Issues

Verify that the VLAN of the access switch management interface is allowed on the trunk connecting to the core switch.

Ensure the VLA

N exists and is active on both switches. Check that the trunk ports are correctly configured and not in an administratively down state. 3.

Layer 3 Routing ProblemsIf the core switch uses SVIs (Switched Virtual Interfaces) for routing, confirm that the access switch subnet is known to the core switch. On the access switch, static routes or default routes may be required if it cannot dynamically learn the path to the core. 4.

STP or Interface Forwarding Issues

Spanning Tree Protocol (STP) misconfigurations can block traffic. Check that the interfaces between core and access switches are in the forwarding state using show spanning-tree interface.

Ensure MST

P or other STP domains are consistent across switches. 5.

MAC Address Learning or Port Security

Sticky MA

C addresses or port-security settings on the access switch can prevent it from learning the core switch MAC, causing ping failures. Disable sticky MAC or verify port-security settings if applicable. 6.

AC

Ls or Firewall RulesAccess Control Lists (ACLs) applied inbound or outbound on the core or access switch can block ICMP traffic. Verify that no ACL is preventing pings from the core to the access switch gateway.

Recommended Troubleshooting Steps

Check Default Gateway: On the access switch, run show running-config and verify ip default-gateway is set correctly.

Verify VLA

Ns and Trunks: Ensure the management VLAN is allowed on the trunk and active on both switches. Use show vlan and show interfaces trunk. Check Routing: Confirm the core switch has a route to the access switch subnet and vice versa.

Use show ip route.

Inspect ST

P: Run show spanning-tree to ensure interfaces are forwarding. Check Port Security: Disable sticky MAC or verify MAC address learning on the access switch interface. Test Connectivity: Use ping with a source interface option to test from the correct VLAN.

Review AC

Ls: Temporarily remove or adjust ACLs to allow ICMP traffic for testing. By systematically verifying these areas, you can identify whether the issue is routing, VLAN, STP, or MAC learning related and restore ping connectivity between the core switch and the access switch gateway.

Core ping fails to reach access switch gateway - ENSAA OPTICAL NETWORKS [PDF]

Core ping fails to reach access switch gateway

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This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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