Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 623

Terminology, VLT domain

Page 623 highlights

VLT physical ports System management protocols L3 VLAN connectivity Optimized forwarding with VRRP Spanning-tree protocol 802.1p, 802.1q, LLDP, flow control, port monitoring, and jumbo frames are supported on VLT physical ports. All system management protocols are supported on VLT ports - SNMP, RMON, AAA, ACL, DNS, FTP, SSH, syslog, NTP, RADIUS, SCP, and LLDP. Enable L3 VLAN connectivity (VLANs assigned with an IP address) on VLT peers by configuring a VLAN interface for the same VLAN on both devices. To enable optimized L3 forwarding over VLT, use VRRP Active-Active mode. VRRP Active-Active mode enables each peer to locally forward L3, resulting in reduced traffic flow between peers over the VLTi. RSTP and RPVST+ are supported on VLT ports. NOTE: 802.1x, DHCP snooping, MSTP, ingress and egress QoS are not supported on VLT ports. Terminology Discovery interface Port interfaces on VLT peers in the VLT interconnect (VLTi) link. Virtual-link trunk A combined port-channel between an attached device and VLT peer switches. (VLT port-channel) VLT domain The domain includes VLT peer devices, VLT interconnect, and all port-channels in the VLT connected to the attached devices. It is also associated with the configuration mode that you must use to assign VLT global parameters. VLT interconnect (VLTi) The link between VLT peer switches used to synchronize operating states. VLT MAC address (Optional) Unique MAC address that you assign to the VLT domain. A VLT MAC address is the common address used for all VLT peers. If you do not configure a VLT MAC address, the MAC address of the primary peer is used as the VLT MAC address across all peers. VLT peer device A pair of devices connected using a dedicated port-channel - the VLTi. VLT port-channel ID Groups port-channel interfaces on VLT peers into a single virtual-link trunk connected to an attached device. Assign the same port-channel ID to interfaces on different peers that you bundle together. VLT peer switches have independent management planes. A VLTi between the VLT chassis maintains synchronization of L2/L3 control planes across the two peer switches. VLT domain A VLT domain includes the VLT peer devices, VLT interconnect, and all port-channels in the VLT that connect to the attached devices. It is also associated with the configuration mode that you must use to assign VLT global parameters. • A VLT domain supports two node members. These peer devices appear as a single logical device to network access devices that connect to VLT ports through a port-channel. • A VLT domain consists of the two core nodes, interconnect trunk, and LAG members that connect to attached devices. • Each VLT domain must have a unique MAC address that you create or that VLT creates automatically. • VLAN ID 4094 is reserved as an internal control VLAN for the VLT domain. • ARP, IPv6 neighbors, and MAC tables synchronize between the VLT peer nodes. • VLT peer devices operate as a separate node with independent control and data planes for devices that attach to non-VLT ports. • One node in the VLT domain takes a primary role and the other node takes the secondary role. In a VLT domain with two nodes, the VLT assigns the primary node role to the node with the highest MAC address. • In a VLT domain, the peer network devices must run the same OS10 software version. Virtual link trunking 623

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VLT physical ports
802.1p, 802.1q, LLDP,
flow
control, port monitoring, and jumbo frames are supported on VLT physical ports.
System
management
protocols
All system management protocols are supported on VLT ports — SNMP, RMON, AAA, ACL, DNS, FTP, SSH,
syslog, NTP, RADIUS, SCP, and LLDP.
L3 VLAN
connectivity
Enable L3 VLAN connectivity (VLANs assigned with an IP address) on VLT peers by
configuring
a VLAN interface
for the same VLAN on both devices.
Optimized
forwarding with
VRRP
To enable optimized L3 forwarding over VLT, use VRRP Active-Active mode. VRRP Active-Active mode enables
each peer to locally forward L3, resulting in reduced
traffic
flow
between peers over the VLTi.
Spanning-tree
protocol
RSTP and RPVST+ are supported on VLT ports.
NOTE:
802.1x, DHCP snooping, MSTP, ingress and egress QoS are not supported on VLT ports.
Terminology
Discovery interface
Port interfaces on VLT peers in the VLT interconnect (VLTi) link.
Virtual-link trunk
(VLT port-channel)
A combined port-channel between an attached device and VLT peer switches.
VLT domain
The domain includes VLT peer devices, VLT interconnect, and all port-channels in the VLT connected to the
attached devices. It is also associated with the
configuration
mode that you must use to assign VLT global
parameters.
VLT interconnect
(VLTi)
The link between VLT peer switches used to synchronize operating states.
VLT MAC address
(Optional) Unique MAC address that you assign to the VLT domain. A VLT MAC address is the common address
used for all VLT peers. If you do not
configure
a VLT MAC address, the MAC address of the primary peer is used as
the VLT MAC address across all peers.
VLT peer device
A pair of devices connected using a dedicated port-channel — the VLTi.
VLT port-channel ID
Groups port-channel interfaces on VLT peers into a single virtual-link trunk connected to an attached device.
Assign the same port-channel ID to interfaces on
different
peers that you bundle together.
VLT peer switches have independent management planes. A VLTi between the VLT chassis maintains synchronization of L2/L3 control
planes across the two peer switches.
VLT domain
A VLT domain includes the VLT peer devices, VLT interconnect, and all port-channels in the VLT that connect to the attached devices. It is
also associated with the
configuration
mode that you must use to assign VLT global parameters.
A VLT domain supports two node members. These peer devices appear as a single logical device to network access devices that
connect to VLT ports through a port-channel.
A VLT domain consists of the two core nodes, interconnect trunk, and LAG members that connect to attached devices.
Each VLT domain must have a unique MAC address that you create or that VLT creates automatically.
VLAN ID 4094 is reserved as an internal control VLAN for the VLT domain.
ARP, IPv6 neighbors, and MAC tables synchronize between the VLT peer nodes.
VLT peer devices operate as a separate node with independent control and data planes for devices that attach to non-VLT ports.
One node in the VLT domain takes a primary role and the other node takes the secondary role. In a VLT domain with two nodes, the
VLT assigns the primary node role to the node with the highest MAC address.
In a VLT domain, the peer network devices must run the same OS10 software version.
Virtual link trunking
623