Networking Tips Tricks

Standard Description 802.1B-1992 LAN/MAN Management 802.1k-1993 Discovery and Dynamic Control of Event Forwarding (Amendment to 802.1B-1992) 802.1D-1990 MAC Bridges 802.1i-1995 FDDI bridging (see ANSI X3T9.5) 802.1j-1996 Managed objects for MAC Bridges P802.1p Traffic Class Expediting and Dynamic Multicast Filtering 802.1D-1998 MAC Bridges (rollup of 802.1D-1990, 802.1j, 802.6k, P802.12e and P802.1p) P802.1r GARP Proprietary Attribute Registration Protocol (GPRP) 802.1t-2001 Technical and Editoral corrections for 802.1D-1998 802.1w-2001 Rapid Reconfiguration of Spanning Tree P802.1y Maintenance to 802.1D-1998

The Rapid Spanning Tree Protocol (RSTP) is an optimized version of STP. RSTP allows a newly elected root port or designated port to enter the forwarding state much quicker under certain conditions than in STP, hence quicker network convergence. Although RSTP allows quicker network convergence, it has the same drawback as STP does: All bridges within a LAN share the same spanning tree, so redundant links cannot be blocked based on VLAN and the packets of all VLANs are forwarded along the same spanning tree. Network Diagram Figure 1  Network diagram for RSTP configuration

Multiple Spanning Tree Protocol (MSTP) supports mapping multiple VLANs to one multiple spanning tree instance (MSTI) by means of a VLAN-to-MSTI mapping table. It allows data flows of VLANs to be forwarded along separate paths as defined in the mapping table, thus reducing communication overheads and resource usage. Note that one VLAN cannot map to multiple MSTIs. Network Diagram Figure 1-1  Network diagram for MSTP configuration