heavy traffic that can be analyzed by monitoring the interface with the

Heavy traffic that can be analyzed by monitoring the

This preview shows page 168 - 171 out of 342 pages.

heavy traffic that can be analyzed by monitoring the interface with the rnonitor interface traffic command. If these basic steps do not resolve the problem of instability of loops in your Layer 2 network, contact JTAC to open a case. Chapter 5 - 20 • Troubleshooting Spanning Tree Protocols
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Advanced Ju nos Enterprise Switching Troubleshooting Agenda: Troubleshooting Spanning Tree Protocols • Spanning Tree Protocols Overview • STP 7RSTP • MSTP •VSTP ©2013 Juniper Networl<s, Inc All rights reseived. JUnID \/Vorldwide Education Services wvm Juniper net J 21 RSTP The slide highlights the topic we discuss next. Troubleshooting Spanning Tree Protocols • Chapter 5-21
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Advanced Junos Enterprise Switching Troubleshooting Rapid Spanning Tree Protocol • RSTP was defined in IEEE 802.1w and later incorporated into IEEE 802.10-2004 • Backward compatible with STP on per port basis • Convergence improvements: • Point-to-point link designation Edge port designation A port that connects to a LAN with no other bridges attached It is always in the forwarding state • Allows for rapid recovery from failures A new root port or designated port can transition to forwarding without waiting for the protocol timers to expire • Direct and indirect link failure and recovery ©2013 Juniper Networks, Inc All rights reserved. J un m \l\lorldwide Education Servic e s WWW 1un1per net I 22 Chapter 5-22 • RSTP Defined Rapid Spanning Tree Protocol (RSTP) was originally defined in the IEEE 802.iw draft and was later incorporated into the IEEE 802.10-2004 specification. RSTP introduces a number of improvements to STP while performing the same basic function. Backward Compatibility Switches configured for STP and RSTP will interoperate with one another. However, you should keep a few basic considerations in mind. If a switch supports only STP and interconnects with a switch running RSTP, it will discard the RST BPDUs. The RSTP-capable switch, upon receiving STP BPDUs, reverts to STP mode on a per interface basis, thus allowing interoperability between the two devices. RSTP Convergence Improvements RSTP provides better convergence time than the original STP. RSTP identifies certain links as point-to-point. When a point-to-point link fails, the alternate link can transition to the forwarding state without waiting for any protocol timers to expire. RSTP provides fast network convergence when a topology change occurs and it greatly decreases the state transition time compared to STP. To aid in the improved convergence, RSTP uses additional features and functionality, such as edge port definitions and rapid direct and indirect link failure detection and recovery. RSTP mostly doesn't rely on expiring timers to transition ports into forwarding or blocking state.
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