Starting xen service caused bridging loop and packet storm in RHEL 5

Solution Unverified - Updated -

Issue

  • When starting xen with (network-script network-bridge) configured in /etc/xen/xend-config.sxp AND a bridge manually configured for eth0 via /etc/sysconfig/network-scripts/ifcfg-eth0, server created a packet storm on the network.

  • Looks like a misconfiguration between the OS network bridge and the xen network-script, trigger the box to start acting as a switch, intercepting routing requests.

  • The number of network sessions from a Xen host increased on the firewall as well as the CPU after updating xen

Environment

  • Red Hat Enterprise Linux (RHEL) 5
  • Xen virtualization
    • (network-script network-bridge) or (network-script network-bridge-bonding) configured in /etc/xen/xend-config.sxp
  • One or more interfaces configured to use a bridge in /etc/sysconfig/network-scripts/ifcfg-*

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