10G, 1G, 40G, Access, Core, Design, Layer 1 Connectivity - Infiniband, QSFP+, SFPs, Transcievers, GBICs, RJ45, Layer 3, S3100, S4048, S4810, S60

VLT, Peer Routing and Routed VLT – Dell Networking

Core Config Options:

First Hop/Gateway Redundancy:

VRRP:

  • Same Switch hosts VRRP and STP Master-ship for deterministic forwarding @ L2/L3 and eliminate suboptimal forwarding path.
  • In a non-VLT domain, only the Master owns VIP and actively forwards @ Layer 3, but in a VLT domain, both Master & backup actively forward traffic in the ”enhanced” VRRP.
  • Can scale to a maximum of 255 VLANs

Peer-Routing:

  • within a VLT domain, each peer forwards routed traffic on behalf of the other, regardless of whether the gateway is hosted on other switch.
  • No VIP Configured. Either peer’s physical IP on the VLAN can be assigned as host gateway – regardless, both peers will forward traffic for own as well as Peer VLAN SVI (Proxy gateway).
  • Achieved by having the destination MAC of the respective VLAN SVI, exist in each peer’s L2 CAM as Local DA.
  • Will scale to the limit of configurable number of VLANs.
  • Enabled globally via a single command, unlike VRRP (Per VLAN)

 

Routed VLT:

  • OSPF/Dynamic RP can be run within the VLT domain, L3 adjacencies can be formed over VLTi between peer switches. Unique to Dell Networking MLAG implementation.

L2/L3 Boundary

  • Core VLT Peers host Layer 3 gateways for the VLANs/network.
  • ToR VLT Peers are Layer2 only, extending L2 domains from the Core down to the Edge.
  • Uplinks between Core and Internet Edge/Firewall will be configured as L3, and managed by static/dynamic RP.

 

VLT, Peer Routing and Routed VLT - hasanmansur.com

 

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About Hasan Mansur

Hasan Mansur --------------------- bis vincit qui se vincit in victoria.

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