7IEEE 802.1s/d.Draft Supplement to Virtual Bridged Local Area Networks:Multiple Spanning Tree[S].IEEE standard for local and metropolitan area networks,2000.
8de Sousa.Improving Load Balance and Resilience of Ethernet Carrier Networks with IEEE 802.1S Multiple Spanning Tree Protocol[Z].Mauritius Islands:5th Int Conference on Networking,2006.
9Virtual Bridged Local Area Networks[S].IEEE Standard 802.1Q,1998.
10Cisco Systems Inc.Understanding Multiple Spanning Tree Protocol[Z].Cisco Inc,2003.