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Table Of Contents
- Dell EMC Networking OS Configuration Guide for the S5048F–ON System 9.14.1.5
- About this Guide
- Configuration Fundamentals
- Getting Started
- Management
- Configuring Privilege Levels
- Configuring Logging
- Log Messages in the Internal Buffer
- Disabling System Logging
- Sending System Messages to a Syslog Server
- Track Login Activity
- Limit Concurrent Login Sessions
- Enabling Secured CLI Mode
- Changing System Logging Settings
- Display the Logging Buffer and the Logging Configuration
- Configuring a UNIX Logging Facility Level
- Synchronizing Log Messages
- Enabling Timestamp on Syslog Messages
- File Transfer Services
- Terminal Lines
- Setting Timeout for EXEC Privilege Mode
- Using Telnet to get to Another Network Device
- Lock CONFIGURATION Mode
- Reloading the system
- Restoring the Factory Default Settings
- 802.1X
- Port-Authentication Process
- Configuring 802.1X
- Important Points to Remember
- Enabling 802.1X
- Configuring dot1x Profile
- Configuring the Static MAB and MAB Profile
- Configuring Critical VLAN
- Configuring MAC addresses for a do1x Profile
- Configuring Request Identity Re-Transmissions
- Forcibly Authorizing or Unauthorizing a Port
- Re-Authenticating a Port
- Configuring Timeouts
- Configuring Dynamic VLAN Assignment with Port Authentication
- Guest and Authentication-Fail VLANs
- Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM)
- Access Control Lists (ACLs)
- IP Access Control Lists (ACLs)
- Configure ACL Range Profiles
- Important Points to Remember
- IP Fragment Handling
- Configure a Standard IP ACL
- Configure an Extended IP ACL
- Configure Layer 2 and Layer 3 ACLs
- Assign an IP ACL to an Interface
- Applying an IP ACL
- Configure Ingress ACLs
- Configure Egress ACLs
- Configuring UDF ACL
- IP Prefix Lists
- ACL Resequencing
- Route Maps
- Bidirectional Forwarding Detection (BFD)
- Border Gateway Protocol (BGP)
- BGP IP version 4 (BGPv4) Overview
- Basic BGP configuration tasks
- Advanced BGP configuration tasks
- Route-refresh and Soft-reconfiguration
- Aggregating Routes
- Filtering BGP
- Configuring BGP Fast Fall-Over
- Configuring Passive Peering
- Enabling Graceful Restart
- Redistributing Routes
- Enabling Additional Paths
- Configuring IP Community Lists
- Configuring an IP Extended Community List
- Configure BGP attributes
- Enabling Multipath
- Route Reflectors
- Enabling Route Flap Dampening
- Changing BGP keepalive and hold timers
- Setting the extended timer
- Enabling or disabling BGP neighbors
- Route Map Continue
- Configuring BGP Confederations
- Configuring a BGP VRF address family
- Maintaining Existing AS Numbers During an AS Migration
- Allowing an AS Number to Appear in its Own AS Path
- Enabling MBGP Configurations
- MBGP support for IPv6
- Configuring IPv6 MBGP between peers
- Example-Configuring IPv4 and IPv6 neighbors
- Configure IPv6 NH Automatically for IPv6 Prefix Advertised over IPv4 Neighbor
- BGP Regular Expression Optimization
- Debugging BGP
- Content Addressable Memory (CAM)
- Control Plane Policing (CoPP)
- Data Center Bridging (DCB)
- Ethernet Enhancements in Data Center Bridging
- Enabling Data Center Bridging
- Data Center Bridging: Default Configuration
- Configuring Priority-Based Flow Control
- Configuring PFC in a DCB Map
- Applying a DCB Map on a Port
- Configuring PFC without a DCB Map
- Priority-Based Flow Control Using Dynamic Buffer Method
- Shared headroom for lossless or PFC packets
- Behavior of Tagged Packets
- Configuration Example for DSCP and PFC Priorities
- SNMP Support for PFC and Buffer Statistics Tracking
- Performing PFC Using DSCP Bits Instead of 802.1p Bits
- PFC and ETS Configuration Examples
- Using PFC to Manage Converged Ethernet Traffic
- Operations on Untagged Packets
- Generation of PFC for a Priority for Untagged Packets
- Configure Enhanced Transmission Selection
- Hierarchical Scheduling in ETS Output Policies
- Using ETS to Manage Converged Ethernet Traffic
- Applying DCB Policies in a Switch Stack
- Configure a DCBx Operation
- Verifying the DCB Configuration
- QoS dot1p Traffic Classification and Queue Assignment
- Configuring the Dynamic Buffer Method
- Sample DCB Configuration
- Dynamic Host Configuration Protocol (DHCP)
- DHCP Packet Format and Options
- Assign an IP Address using DHCP
- Implementation Information
- Configure the System to be a DHCP Server
- Configure the System to be a DHCP Client
- Configuring DHCP relay source interface
- Configure Secure DHCP
- Option 82 (DHCPv4 relay options)
- DHCPv6 relay agent options
- DHCP Snooping
- Enabling DHCP Snooping
- Enabling IPv6 DHCP Snooping
- Adding a Static Entry in the Binding Table
- Adding a Static IPV6 DHCP Snooping Binding Table
- Clearing the Binding Table
- Clearing the DHCP IPv6 Binding Table
- Displaying the Contents of the Binding Table
- Displaying the Contents of the DHCPv6 Binding Table
- Debugging the IPv6 DHCP
- IPv6 DHCP Snooping MAC-Address Verification
- Drop DHCP Packets on Snooped VLANs Only
- Dynamic ARP Inspection
- Configuring Dynamic ARP Inspection
- Source Address Validation
- Equal Cost Multi-Path (ECMP)
- FIP Snooping
- Fibre Channel over Ethernet
- Ensure Robustness in a Converged Ethernet Network
- FIP Snooping on Ethernet Bridges
- Using FIP Snooping
- FIP Snooping Prerequisites
- Important Points to Remember
- Enabling the FCoE Transit Feature
- Enable FIP Snooping on VLANs
- Configure the FC-MAP Value
- Configure a Port for a Bridge-to-Bridge Link
- Configure a Port for a Bridge-to-FCF Link
- Impact on Other Software Features
- FIP Snooping Restrictions
- Configuring FIP Snooping
- Displaying FIP Snooping Information
- FCoE Transit Configuration Example
- Flex Hash and Optimized Boot-Up
- Force10 Resilient Ring Protocol (FRRP)
- GARP VLAN Registration Protocol (GVRP)
- Internet Group Management Protocol (IGMP)
- IGMP Protocol Overview
- Configure IGMP
- Viewing IGMP Enabled Interfaces
- Selecting an IGMP Version
- Viewing IGMP Groups
- Adjusting Timers
- Enabling IGMP Immediate-Leave
- IGMP Snooping
- Fast Convergence after MSTP Topology Changes
- Egress Interface Selection (EIS) for HTTP and IGMP Applications
- Designating a Multicast Router Interface
- Interfaces
- Interface Types
- View Basic Interface Information
- Resetting an Interface to its Factory Default State
- Enabling a Physical Interface
- Physical Interfaces
- Egress Interface Selection (EIS)
- Management Interfaces
- VLAN Interfaces
- Loopback Interfaces
- Null Interfaces
- Port Channel Interfaces
- Port Channel Definition and Standards
- Port Channel Benefits
- Port Channel Implementation
- Interfaces in Port Channels
- Configuration Tasks for Port Channel Interfaces
- Creating a Port Channel
- Adding a Physical Interface to a Port Channel
- Reassigning an Interface to a New Port Channel
- Configuring the Minimum Oper Up Links in a Port Channel
- Adding or Removing a Port Channel from a VLAN
- Assigning an IP Address to a Port Channel
- Deleting or Disabling a Port Channel
- Load Balancing Through Port Channels
- Load-Balancing Method
- Changing the Hash Algorithm
- Bulk Configuration
- Defining Interface Range Macros
- Monitoring and Maintaining Interfaces
- Non Dell-Qualified Transceivers
- Splitting 100G Ports
- Link Dampening
- Link Bundle Monitoring
- Using Ethernet Pause Frames for Flow Control
- Configure the MTU Size on an Interface
- Configuring wavelength for 10–Gigabit SFP+ optics
- Port-Pipes
- CR4 Auto-Negotiation
- Setting the Speed of Ethernet Interfaces
- Speed Setting on 25G Interfaces
- Configuring 10G speed on 25G ports
- FEC Configuration
- View Advanced Interface Information
- Configuring the Traffic Sampling Size Globally
- Dynamic Counters
- Enhanced Validation of Interface Ranges
- Compressing Configuration Files
- OUI on 25G and 50G Interfaces
- IPv4 Routing
- IP Addresses
- Configuration Tasks for IP Addresses
- Assigning IP Addresses to an Interface
- Configuring Static Routes
- Configure Static Routes for the Management Interface
- Using the Configured Source IP Address in ICMP Messages
- Configuring the Duration to Establish a TCP Connection
- Enabling Directed Broadcast
- Resolution of Host Names
- Enabling Dynamic Resolution of Host Names
- Specifying the Local System Domain and a List of Domains
- Configuring DNS with Traceroute
- ARP
- Configuration Tasks for ARP
- Configuring Static ARP Entries
- Enabling Proxy ARP
- Clearing ARP Cache
- ARP Learning via Gratuitous ARP
- Enabling ARP Learning via Gratuitous ARP
- ARP Learning via ARP Request
- Configuring ARP Retries
- ICMP
- Configuration Tasks for ICMP
- Enabling ICMP Unreachable Messages
- ICMP Redirects
- UDP Helper
- Enabling UDP Helper
- Configuring a Broadcast Address
- Configurations Using UDP Helper
- UDP Helper with Broadcast-All Addresses
- UDP Helper with Subnet Broadcast Addresses
- UDP Helper with Configured Broadcast Addresses
- UDP Helper with No Configured Broadcast Addresses
- Troubleshooting UDP Helper
- IPv6 Routing
- Protocol Overview
- Implementing IPv6 with Dell EMC Networking OS
- ICMPv6
- Path MTU discovery
- IPv6 Neighbor Discovery
- Secure Shell (SSH) Over an IPv6 Transport
- Configuration Tasks for IPv6
- Configuring IPv6 RA Guard
- iSCSI Optimization
- iSCSI Optimization Overview
- Monitoring iSCSI Traffic Flows
- Application of Quality of Service to iSCSI Traffic Flows
- Information Monitored in iSCSI Traffic Flows
- Detection and Auto-Configuration for Dell EqualLogic Arrays
- Configuring Detection and Ports for Dell Compellent Arrays
- Synchronizing iSCSI Sessions Learned on VLT-Lags with VLT-Peer
- Enable and Disable iSCSI Optimization
- Default iSCSI Optimization Values
- iSCSI Optimization Prerequisites
- Configuring iSCSI Optimization
- Displaying iSCSI Optimization Information
- iSCSI Optimization Overview
- Intermediate System to Intermediate System
- IS-IS Protocol Overview
- IS-IS Addressing
- Multi-Topology IS-IS
- Graceful Restart
- Implementation Information
- Configuration Information
- IS-IS Metric Styles
- Configure Metric Values
- Sample Configurations
- Link Aggregation Control Protocol (LACP)
- Layer 2
- Link Layer Discovery Protocol (LLDP)
- 802.1AB (LLDP) Overview
- Optional TLVs
- TIA-1057 (LLDP-MED) Overview
- Configure LLDP
- CONFIGURATION versus INTERFACE Configurations
- Enabling LLDP
- Enabling LLDP on Management Ports
- Advertising TLVs
- Viewing the LLDP Configuration
- Viewing Information Advertised by Adjacent LLDP Neighbors
- Configuring LLDPDU Intervals
- Configuring Transmit and Receive Mode
- Configuring the Time to Live Value
- Debugging LLDP
- Relevant Management Objects
- Microsoft Network Load Balancing
- Multicast Source Discovery Protocol (MSDP)
- Anycast RP
- Implementation Information
- Configure Multicast Source Discovery Protocol
- Enable MSDP
- Manage the Source-Active Cache
- Accept Source-Active Messages that Fail the RFP Check
- Specifying Source-Active Messages
- Limiting the Source-Active Messages from a Peer
- Preventing MSDP from Caching a Local Source
- Preventing MSDP from Caching a Remote Source
- Preventing MSDP from Advertising a Local Source
- Logging Changes in Peership States
- Terminating a Peership
- Clearing Peer Statistics
- Debugging MSDP
- MSDP with Anycast RP
- Configuring Anycast RP
- MSDP Sample Configurations
- Multicast Listener Discovery Protocol
- Multiple Spanning Tree Protocol (MSTP)
- Spanning Tree Variations
- Configure Multiple Spanning Tree Protocol
- Enable Multiple Spanning Tree Globally
- Adding and Removing Interfaces
- Creating Multiple Spanning Tree Instances
- Influencing MSTP Root Selection
- Interoperate with Non-Dell Bridges
- Changing the Region Name or Revision
- Modifying Global Parameters
- Modifying the Interface Parameters
- Setting STP path cost as constant
- Configuring an EdgePort
- Flush MAC Addresses after a Topology Change
- MSTP Sample Configurations
- Debugging and Verifying MSTP Configurations
- Multicast Features
- Object Tracking
- Open Shortest Path First (OSPFv2 and OSPFv3)
- Protocol Overview
- OSPF with Dell EMC Networking OS
- Configuration Information
- Configuration Task List for OSPFv2 (OSPF for IPv4)
- Enabling OSPFv2
- Assigning a Router ID
- Assigning an OSPFv2 Area
- Enable OSPFv2 on Interfaces
- Configuring Stub Areas
- Enabling Passive Interfaces
- Enabling Fast-Convergence
- Changing OSPFv2 Parameters on Interfaces
- Enabling OSPFv2 Authentication
- Enabling OSPFv2 Graceful Restart
- Creating Filter Routes
- Applying Prefix Lists
- Redistributing Routes
- Troubleshooting OSPFv2
- Sample Configurations for OSPFv2
- Configuration Task List for OSPFv2 (OSPF for IPv4)
- Configuration Task List for OSPFv3 (OSPF for IPv6)
- Enabling IPv6 Unicast Routing
- Assigning IPv6 Addresses on an Interface
- Assigning Area ID on an Interface
- Assigning OSPFv3 Process ID and Router ID Globally
- Assigning OSPFv3 Process ID and Router ID to a VRF
- Configuring Stub Areas
- Configuring Passive-Interface
- Redistributing Routes
- Configuring a Default Route
- Applying cost for OSPFv3
- Enabling OSPFv3 Graceful Restart
- OSPFv3 Authentication Using IPsec
- Troubleshooting OSPFv3
- MIB Support for OSPFv3
- Policy-based Routing (PBR)
- PIM Sparse-Mode (PIM-SM)
- PIM Source-Specific Mode (PIM-SSM)
- Port Monitoring
- Important Points to Remember
- Port Monitoring
- Configuring Port Monitoring
- Configuring Monitor Multicast Queue
- Flow-Based Monitoring
- Remote Port Mirroring
- Encapsulated Remote Port Monitoring
- ERPM Behavior on a typical Dell EMC Networking OS
- Port Monitoring on VLT
- Private VLANs (PVLAN)
- Per-VLAN Spanning Tree Plus (PVST+)
- Protocol Overview
- Implementation Information
- Configure Per-VLAN Spanning Tree Plus
- Enabling PVST+
- Disabling PVST+
- Influencing PVST+ Root Selection
- Modifying Global PVST+ Parameters
- Modifying Interface PVST+ Parameters
- Configuring an EdgePort
- PVST+ in Multi-Vendor Networks
- Enabling PVST+ Extend System ID
- PVST+ Sample Configurations
- Quality of Service (QoS)
- Implementation Information
- Port-Based QoS Configurations
- Policy-Based QoS Configurations
- Enabling QoS Rate Adjustment
- Enabling Strict-Priority Queueing
- Queue Classification Requirements for PFC Functionality
- Support for marking dot1p value in L3 Input Qos Policy
- Weighted Random Early Detection
- Pre-Calculating Available QoS CAM Space
- Specifying Policy-Based Rate Shaping in Packets Per Second
- Configuring Policy-Based Rate Shaping
- Configuring Weights and ECN for WRED
- Configuring WRED and ECN Attributes
- Guidelines for Configuring ECN for Classifying and Color-Marking Packets
- Applying Layer 2 Match Criteria on a Layer 3 Interface
- Enabling Buffer Statistics Tracking
- Routing Information Protocol (RIP)
- Remote Monitoring (RMON)
- Rapid Spanning Tree Protocol (RSTP)
- Protocol Overview
- Configuring Rapid Spanning Tree
- Important Points to Remember
- Configuring Interfaces for Layer 2 Mode
- Enabling Rapid Spanning Tree Protocol Globally
- Adding and Removing Interfaces
- Modifying Global Parameters
- Modifying Interface Parameters
- Enabling SNMP Traps for Root Elections and Topology Changes
- Influencing RSTP Root Selection
- Configuring an EdgePort
- Configuring Fast Hellos for Link State Detection
- Software-Defined Networking (SDN)
- Security
- AAA Accounting
- AAA Authentication
- Obscuring Passwords and Keys
- AAA Authorization
- RADIUS
- RADIUS Authentication
- Configuration Task List for RADIUS
- TACACS+
- Protection from TCP Tiny and Overlapping Fragment Attacks
- Enabling SCP and SSH
- Using SCP with SSH to Copy a Software Image
- Removing the RSA Host Keys and Zeroizing Storage
- Configuring When to Re-generate an SSH Key
- Configuring the SSH Server Key Exchange Algorithm
- Configuring the HMAC Algorithm for the SSH Server
- Configuring the HMAC Algorithm for the SSH Client
- Configuring the SSH Server Cipher List
- Configuring the SSH Client Cipher List
- Secure Shell Authentication
- Troubleshooting SSH
- Telnet
- VTY Line and Access-Class Configuration
- Role-Based Access Control
- Two Factor Authentication (2FA)
- Configuring the System to Drop Certain ICMP Reply Messages
- SSH Lockout Settings
- Service Provider Bridging
- sFlow
- Simple Network Management Protocol (SNMP)
- Protocol Overview
- Implementation Information
- SNMPv3 Compliance With FIPS
- Configuration Task List for SNMP
- Important Points to Remember
- Set up SNMP
- Reading Managed Object Values
- Writing Managed Object Values
- Configuring Contact and Location Information using SNMP
- Subscribing to Managed Object Value Updates using SNMP
- Enabling a Subset of SNMP Traps
- Enabling an SNMP Agent to Notify Syslog Server Failure
- Copy Configuration Files Using SNMP
- Copying a Configuration File
- Copying Configuration Files via SNMP
- Copying the Startup-Config Files to the Running-Config
- Copying the Startup-Config Files to the Server via FTP
- Copying the Startup-Config Files to the Server via TFTP
- Copy a Binary File to the Startup-Configuration
- Additional MIB Objects to View Copy Statistics
- Obtaining a Value for MIB Objects
- MIB Support for Power Monitoring
- MIB Support for 25G, 40G, 50G, 100G Optical Transceiver or DAC cable IDPROM user info
- MIB Support to Display the Available Memory Size on Flash
- MIB Support to Display the Software Core Files Generated by the System
- MIB Support for PFC Storm Control
- MIB Support for PFC no-drop-priority L2Dlf Drop
- MIB Support for Monitoring the overall buffer usage for lossy and lossless traffic per XPE
- SNMP Support for WRED Green/Yellow/Red Drop Counters
- MIB Support to Display the Available Partitions on Flash
- MIB Support to Display the ECN Marked Packets
- MIB Support to Display Egress Queue Statistics
- MIB Support to ECMP Group Count
- _
- MIB Support for entAliasMappingTable
- MIB Support for LAG
- MIB Support for CAM
- MIB support for MAC notification traps
- MIB support for Port Security
- Configuring SNMP traps for new MAC learning or station–move
- Manage VLANs using SNMP
- Managing Overload on Startup
- Enabling and Disabling a Port using SNMP
- Fetch Dynamic MAC Entries using SNMP
- Example of Deriving the Interface Index Number
- Monitor Port-Channels
- Troubleshooting SNMP Operation
- Transceiver Monitoring
- Configuring SNMP context name
- Storm Control
- Spanning Tree Protocol (STP)
- Protocol Overview
- Configure Spanning Tree
- Important Points to Remember
- Configuring Interfaces for Layer 2 Mode
- Enabling Spanning Tree Protocol Globally
- Adding an Interface to the Spanning Tree Group
- Modifying Global Parameters
- Modifying Interface STP Parameters
- Enabling PortFast
- Selecting STP Root
- STP Root Guard
- Enabling SNMP Traps for Root Elections and Topology Changes
- Configuring Spanning Trees as Hitless
- STP Loop Guard
- Displaying STP Guard Configuration
- SupportAssist
- System Time and Date
- Tunneling
- Uplink Failure Detection (UFD)
- Upgrade Procedures
- Virtual LANs (VLANs)
- Virtual Link Trunking (VLT)
- Overview
- Configure Virtual Link Trunking
- RSTP Configuration
- Preventing Forwarding Loops in a VLT Domain
- Sample RSTP configuration
- Configuring VLT
- Configuring a VLT Interconnect
- Enabling VLT and Creating a VLT Domain
- Configuring a VLT Backup Link
- Configuring a VLT Port Delay Period
- Reconfiguring the Default VLT Settings (Optional)
- Connecting a VLT Domain to an Attached Access Device (Switch or Server)
- Configuring a VLT VLAN Peer-Down (Optional)
- Configuring Enhanced VLT (Optional)
- VLT Sample Configuration
- PVST+ Configuration
- Peer Routing Configuration Example
- eVLT Configuration Example
- PIM-Sparse Mode Configuration Example
- Verifying a VLT Configuration
- Additional VLT Sample Configurations
- Troubleshooting VLT
- Reconfiguring Stacked Switches as VLT
- Specifying VLT Nodes in a PVLAN
- Configuring a VLT VLAN or LAG in a PVLAN
- Proxy ARP Capability on VLT Peer Nodes
- VLT Nodes as Rendezvous Points for Multicast Resiliency
- Configuring VLAN-Stack over VLT
- IPv6 Peer Routing in VLT Domains Overview
- Configure BFD in VLT Domain
- VLT Proxy Gateway
- Virtual Extensible LAN (VXLAN)
- Virtual Routing and Forwarding (VRF)
- Virtual Router Redundancy Protocol (VRRP)
- VRRP Overview
- VRRP Benefits
- VRRP Implementation
- VRRP Configuration
- Configuration Task List
- Creating a Virtual Router
- Configuring the VRRP Version for an IPv4 Group
- Assign Virtual IP addresses
- Configuring a Virtual IP Address
- Setting VRRP Group (Virtual Router) Priority
- Configuring VRRP Authentication
- Disabling Preempt
- Changing the Advertisement Interval
- Track an Interface or Object
- Tracking an Interface
- Setting VRRP Initialization Delay
- Configuration Task List
- Sample Configurations
- Debugging and Diagnostics
- Standards Compliance
- X.509v3
- Introduction to X.509v3 certificates
- X.509v3 support in
- Information about installing CA certificates
- Information about Creating Certificate Signing Requests (CSR)
- Information about installing trusted certificates
- Transport layer security (TLS)
- Online Certificate Status Protocol (OSCP)
- Verifying certificates
- Event logging
○ In order that the chassis backup link does not share the same physical path as the interconnect trunk, Dell EMC
Networking recommends using the management ports on the chassis and traverse an out-of-band management network.
The backup link can use user ports, but not the same ports the interconnect trunk uses.
○ The chassis backup link does not carry control plane information or data traffic. Its use is restricted to health checks only.
● Virtual link trunks (VLTs) between access devices and VLT peer switches
○ To connect servers and access switches with VLT peer switches, you use a VLT port channel, as shown in Overview. Up
to 96 port-channels are supported; up to 32 member links are supported in each port channel between the VLT domain
and an access device.
○ The discovery protocol running between VLT peers automatically generates the ID number of the port channel that
connects an access device and a VLT switch. The discovery protocol uses LACP properties to identify connectivity to a
common client device and automatically generates a VLT number for port channels on VLT peers that connects to the
device. The discovery protocol requires that an attached device always runs LACP over the port-channel interface.
○ VLT provides a loop-free topology for port channels with endpoints on different chassis in the VLT domain.
○ VLT uses shortest path routing so that traffic destined to hosts via directly attached links on a chassis does not traverse
the chassis-interconnect link.
○ VLT allows multiple active parallel paths from access switches to VLT chassis.
○ VLT supports port-channel links with LACP between access switches and VLT peer switches. Dell EMC Networking
recommends using static port channels on VLTi.
○ If VLTi connectivity with a peer is lost but the VLT backup connectivity indicates that the peer is still alive, the VLT ports
on the Secondary peer are orphaned and are shut down.
■ In one possible topology, a switch uses the BMP feature to receive its IP address, configuration files, and boot image
from a DHCP server that connects to the switch through the VLT domain. In the port-channel used by the switch
to connect to the VLT domain, configure the port interfaces on each VLT peer as hybrid ports before adding them
to the port channel (see Connecting a VLT Domain to an Attached Access Device (Switch or Server)). To configure
a port in Hybrid mode so that it can carry untagged, single-tagged, and double-tagged traffic, use the portmode
hybrid command in Interface Configuration mode as described in Configuring Native VLANs.
■ For example, if the DHCP server is on the ToR and VLTi (ICL) is down (due to either an unavailable peer or a link
failure), whether you configured the VLT LAG as static or LACP, when a single VLT peer is rebooted in BMP mode, it
cannot reach the DHCP server, resulting in BMP failure.
● Software features supported on VLT port-channels
○ In a VLT domain, the following software features are supported on VLT port-channels: 802.1p, ingress and egress
ACLs, BGP, DHCP relay, IS-IS, OSPF, active-active PIM-SM, PIM-SSM, VRRP, Layer 3 VLANs, LLDP, flow control, port
monitoring, jumbo frames, IGMP snooping, sFlow, ingress and egress ACLs, and Layer 2 control protocols RSTP and
PVST only.
NOTE:
Peer VLAN spanning tree plus (PVST+) passthrough is supported in a VLT domain. PVST+ BPDUs does
not result in an interface shutdown. PVST+ BPDUs for a nondefault VLAN is flooded out as any other L2 multicast
packet. On a default VLAN, RTSP is part of the PVST+ topology in that specific VLAN (default VLAN).
○ In a VLT domain, ingress and egress QoS policies are supported on physical VLT ports, which can be members of VLT
port channels in the domain.
■ Ingress and egress QoS policies applied on VLT ports must be the same on both VLT peers.
■ Apply the same ingress and egress QoS policies on VLTi (ICL) member ports to handle failed links.
○ For detailed information about how to use VRRP in a VLT domain, see the following VLT and VRRP interoperability
section.
○ For information about configuring IGMP Snooping in a VLT domain, see VLT and IGMP Snooping.
○ All system management protocols are supported on VLT ports, including SNMP, RMON, AAA, ACL, DNS, FTP, SSH,
Syslog, NTP, RADIUS, SCP, TACACS+, Telnet, and LLDP.
○ Enable Layer 3 VLAN connectivity VLT peers by configuring a VLAN network interface for the same VLAN on both
switches.
○ Dell EMC Networking does not recommend enabling peer-routing if the CAM is full. To enable peer-routing, a minimum of
two local DA spaces for wild-card functionality are required.
○ RSPAN and ERSPAN are supported on VLT.
○ FRRP is supported only on the VLTi. This feature enables configuration of an FRRP ring through VLTi. However, FRRP is
not supported on any other VLT port-channel except for VLTi.
● Software features supported on VLT physical ports
○ In a VLT domain, the following software features are supported on VLT physical ports: 802.1p, LLDP, flow control, IPv6
dynamic routing, port monitoring, DHCP snooping, and jumbo frames.
● Software features not supported with VLT
○ In a VLT domain, the following software features are not supported on VLT ports: 802.1x, GVRP, and BFD.
● VLT and VRRP interoperability
Virtual Link Trunking (VLT)
909