Bug ID 532799: Static Link route to /32 pool member can end using dst broadcast MAC

Last Modified: Nov 07, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP All(all modules)

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Fixed In:
12.1.0, 11.6.1 HF1, 11.5.4

Opened: Jul 10, 2015
Severity: 4-Minor
Related Article:
K14551525

Symptoms

After assigning a static route to a node on a specific VLAN, ARPs are no longer generated, and all traffic to the node uses a broadcast (ff:ff:ff:ff:ff:ff) MAC.

Impact

This can cause the monitors to fail and the poolmember/node to be marked down.

Conditions

Static VLAN route to a poolmember/node with a /32 mask.

Workaround

Use a non /32 mask or use a gateway route instead.

Fix Information

The BIG-IP system now correctly uses ARP to determine the destination MAC of a host routed via a /32 vlan route.

Behavior Change