Design Reference

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Table Of Contents

Contents
Chapter 1: Introduction
- Purpose
- Related resources
- Support
Chapter 2: New in Release 4.0.50
- Features
- Other changes
Chapter 3: New in Release 4.0.40
- Features
- Other changes
Chapter 4: New in Release 4.0
- Features
- Other changes
Chapter 5: Network design fundamentals
Chapter 6: Hardware fundamentals and guidelines
- Supported hardware
- Platform considerations
- Hardware compatibility
- Supported optical devices
- Dispersion considerations for long reach
- 10/100BASE-X and 1000BASE-TX reach
- 10/100/1000BASE-TX Auto-Negotiation recommendations
- Auto MDIX
- CANA
Chapter 7: Optical routing design
- Optical routing system components
Chapter 8: Platform redundancy
- Power redundancy
- Input/output port redundancy
- Configuration redundancy
- Link redundancy
Chapter 9: Link redundancy
- Physical layer redundancy
- MultiLink Trunking
- 802.3ad-based link aggregation
Chapter 10: Layer 2 loop prevention
- Loop prevention and detection
- SLPP example scenarios
Chapter 11: Spanning tree
- Spanning tree and protection against isolated VLANs
- MSTP and RSTP considerations
Chapter 12: Layer 3 network design
- VRF Lite
- Virtual Router Redundancy Protocol
- Open Shortest Path First
- Border Gateway Protocol
- IP routed interface scaling
Chapter 13: SPBM design guidelines
- 802.1aq standard
- VLANs without member ports
- Provisioning
- Implementation options
- Reference architectures
- Solution-specific reference architectures
- Best practices
- SPBM restrictions and limitations
- IP multicast over SPBM restrictions
Chapter 14: IP multicast network design
- Multicast and VRF-Lite
- Multicast and MultiLink Trunking considerations
- Multicast scalability design rules
- IP multicast address range restrictions
- Multicast MAC address mapping considerations
- Dynamic multicast configuration changes
- IGMPv3 backward compatibility
- IGMP Layer 2 Querier
- TTL in IP multicast packets
- Multicast MAC filtering
- Guidelines for multicast access policies
- Multicast for multimedia
Chapter 15: System and network stability and security
- DoS protection mechanisms
- Damage prevention
- Data plane security
- Control plane security
- Additional information
Chapter 16: QoS design guidelines
- QoS mechanisms
- QoS interface considerations
- Network congestion and QoS design
- QoS examples and recommendations
Chapter 17: Layer 1, 2, and 3 design examples
- Layer 1 example
- Layer 2 example
- Layer 3 example
Chapter 18: Software scaling capabilities
Chapter 19: Supported standards, RFCs, and MIBs
- Supported IEEE standards
- Supported RFCs
- Quality of service
- Network management
- MIBs
- Standard MIBs
- Proprietary MIBs
Glossary

Chapter 11: Spanning tree

Spanning tree prevents loops in switched networks. Avaya Virtual Services Platform 4000 Series

supports Rapid Spanning Tree Protocol (RSTP) and Multiple Spanning Tree Protocol (MSTP). This

chapter describes issues to consider when you configure spanning tree protocols.

For more information about spanning tree protocols, see Avaya Virtual Services Platform 4000

Series Configuration — VLANs and Spanning Tree, NN46251-500.

Spanning tree and protection against isolated VLANs

Virtual Local Area Network (VLAN) isolation disrupts packet forwarding. The following figure

illustrates the problem. Two VLANs (V1 and V2) connect four devices, and both VLANs are in the

same spanning tree group. V2 includes three of the four devices, whereas V1 includes all four

devices. After a spanning tree protocol detects a loop, it blocks the link with the highest link cost. In

this case, the 100 Mbps link is blocked, which isolates a device in V2. To avoid this problem, either

configure V2 on all four devices or use MSTP with a different Multiple Spanning Tree Instance

(MSTI) for each VLAN.

52 Network Design Reference for Avaya VSP 4000 Series December 2014

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