Services on the QFX Series - Juniper.net

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<strong>Services</strong> on the QFX Series } Configuring DHCP Smart Relay You can use DHCP smart relay to provide redundancy and resiliency to your DHCP relay configuration. Smart relay provides additional relay functionality and requires all of the configuration settings required by DHCP relay. To use DHCP smart relay, you also need an interface with multiple IP addresses assigned to it. You can achieve this by doing either of the following tasks: • Create a routed VLAN interface and assign at least two IP addresses to it. See Configuring Routed VLAN Interfaces and Example: Configuring Routing Between VLANs on One Switch for information about this approach. • Create a Layer 3 logical interface (by using VLAN tagging) and assign at least two IP addresses to it. See “Understanding Layer 3 Logical Interfaces” on page 7 and Configuring a Layer 3 Logical Interface for information about this approach. Once you have created an interface with multiple IP addresses, complete the smart relay configuration by entering one of the following statements: • set forwarding-options helpers bootp smart-relay-global: Use this statement to enable smart relay on all the interfaces that are configured as relay agents. • set forwarding-options helpers bootp interface interface-name smart-relay-agent: Use this statement to enable smart relay on a specific interface. When smart relay is configured for an interface, the switch initially sends DHCP request (discover) messages out of that interface using the primary address of the interface as the gateway IP address (in the giaddr field) for the DHCP message. If no DHCP offer message is received from a server in reply, the switch allows the client to send as many as three more discover messages using the same gateway IP address. If no DHCP offer message is received after three retries, the switch resends the discover message using the alternate IP address as the gateway IP address. If you configure more than two IP addresses on the relay agent interface, the switch repeats this process until a DHCP offer message is received or all of the IP addresses have been used without success. 28 Copyright © 2013, Juniper Networks, Inc.
CHAPTER 5 Configuration Statements for Port Mirroring Copyright © 2013, Juniper Networks, Inc. 29
Page 1 and 2: Services on the QF
Page 3 and 4: Table of Contents About the Documen
Page 5 and 6: Table of Contents Part 3 Administra
Page 7 and 8: List of Figures Part 2 Configuratio
Page 9 and 10: List of Tables About the Documentat
Page 11 and 12: About the Documentation Documentati
Page 13 and 14: About the Documentation [edit] user
Page 15 and 16: About the Documentation https://www
Page 17 and 18: PART 1 Overview • Port Mirroring
Page 19 and 20: CHAPTER 1 Port Mirroring Understand
Page 21 and 22: Chapter 1: Port Mirroring Table 3:
Page 23 and 24: Chapter 1: Port Mirroring • CPU-g
Page 25 and 26: CHAPTER 2 DHCP Relay DHCP and BOOTP
Page 27 and 28: PART 2 Configuration • Configurat
Page 29 and 30: CHAPTER 3 Configuration Examples
Page 31 and 32: Chapter 3: Configuration Examples u
Page 33 and 34: Chapter 3: Configuration Examples V
Page 35 and 36: Chapter 3: Configuration Examples S
Page 37 and 38: Chapter 3: Configuration Examples }
Page 39 and 40: CHAPTER 4 Configuration Tasks Confi
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Page 43: Chapter 4: Configuration Tasks rela
Page 47 and 48: Chapter 5: Configuration Statements
Page 57 and 58: CHAPTER 6 Configuration Statements
Page 77 and 78: CHAPTER 7 Configuration Statements
Page 85 and 86: PART 3 Administration • Monitorin
Page 87 and 88: CHAPTER 8 Monitoring Commands for P
Page 89 and 90: Chapter 8: Monitoring Commands for
Page 91 and 92: PART 4 Troubleshooting • Troubles
Page 93 and 94: CHAPTER 9 Troubleshooting Procedure
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Chapter 9: Troubleshooting Procedur
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Services on the QFX Series - Juniper.net

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