Last Modified: Oct 06, 2020
See more info
Known Affected Versions:
11.2.1, 11.3.0, 11.4.0
11.4.1, 11.2.1 HF15
Opened: May 30, 2013
Related AskF5 Article: K14455
tcpdump will show an inbound echo of some outbound L2 multicast IP traffic on the 2.x interfaces.
This may cause an incorrect or confusing fdb entry to appear for the source MAC address if the multicast IP packet is being bridged through from one interface on the VLAN to another (IPv6 router advertisements for example). For sites using neither IPv6 nor MAC level multicast IPv4 this is unlikely to occur.
This will only occur when transmitting IPv4 or IPv6 packets to Ethernet multicast or broadcast addresses, and only on the 2.x bank of interfaces of a BIG-IP 2000, 2200, 4000, or 4200 platform.
The fix is simple, and can be implemented by editing an init script: In /etc/init.d/stratospfinit there is a line that reads: modprobe ixgbe max_vfs=$vfs,$vfs force_rss_sriov=1,1 lacp_target_queue=1,1 >/dev/null 2>&1 replacing it with a line that reads: modprobe ixgbe max_vfs=$vfs,$vfs force_rss_sriov=1,1 lacp_target_queue=1,1 L2LBen=0,0 >/dev/null 2>&1 will fix the problem (a reboot is required after the edit).
Correct erroneous loopback of L2 multicast IP traffic on 2.x interfaces of BIG-IP 2000, 2200, 4000, and 4200 platforms.