HP server has some features to share their management network with the first Ethernet port.
Attached are two links that provide detail into the Shared Network Port functionality for iLO2 and iLO3 (G7 servers).
Page 64 of the iLO2 user's guide provides information on iLO 2 Shared Management Port features and restrictions.
http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02239247/c02239247.pdf
Page 46 of the iLO3 user's guide provides information on iLO 3 Shared Management Port features and restrictions.
http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02063196/c02063196.pdf