Network Virtualization using Extreme Fabric Connect
Table Of Contents
- Table of Contents
- Table of Contents
- Table of Contents
- Table of Figures
- Table of Figures
- Table of Tables
- Conventions
- Introduction
- Reference Architecture
- Guiding Principles
- Architecture Components
- User to Network Interface
- Network to Network Interface
- Backbone Core Bridge
- Backbone Edge Bridge
- Customer MAC Address
- Backbone MAC Address
- SMLT-Virtual-BMAC
- IS-IS Area
- IS-IS System ID
- IS-IS Overload Function
- SPB Bridge ID
- SPBM Nick-name
- Dynamic Nick-name Assignment
- Customer VLAN
- Backbone VLAN
- Virtual Services Networks
- I-SID
- Inter-VSN Routing
- Fabric Area Network
- Fabric Attach / Auto-Attach
- FA Server
- FA Client
- FA Proxy
- FA Standalone Proxy
- VPN Routing and Forwarding Instance
- Global Router Table
- Distributed Virtual Routing
- Zero Touch Fabric (ZTF)
- Foundations for the Service Enabled Fabric
- IP Routing and L3 Services over Fabric Connect
- L2 Services Over SPB IS-IS Core
- Fabric Attach
- IP Multicast Enabled VSNs
- Extending the Fabric Across the WAN
- Distributed Virtual Routing
- Quality of Service
- Consolidated Design Overview
- High Availability
- Fabric and VSN Security
- Fabric as Best Foundation for SDN
- Glossary
- Reference Documentation
- Revisions
Network Virtualization Using Extreme Fabric Connect
© 2019 Extreme Networks, Inc. All rights reserved. 151
Figure 88 SMLT with RSMLT-Edge
With RSMLT, each switch in the SMLT cluster possesses its own IP address on a given VLAN. End user
devices should be configured with one or the other (does not matter which one) IP address as default
gateway.
The VLAN IP interface of the first switch is tied to a VLAN allocated MAC address derived from the chassis
MAC of that switch. Likewise, on the second switch in the cluster.
RSMLT uses IST signalling to make the first switch take “ownership” of the corresponding VLAN MAC
address of the second switch, and vice-versa. Therefore, unlike VRRP Backup-Master, RSMLT can only
operate on the two routers forming the SMLT cluster.
Tip
An IP router will only IP route a packet if the packet was sent to its MAC address (or any
other MAC address it has been programmed to “own”). By letting both routers “own”
eachother’s VLAN MAC address, both routers are able to perform IP routing for
eachother’s IP in an active/active fashion.
With RSMLT-Edge each switch is also capable of responding to ARP (and ICMP in case of peer failure)
requests for its IST peer’s IP address and the peered VLAN MAC addresses are automatically saved to the
config file, thus ensuring that the scheme will keep working even if both nodes are powered off and only
one of them is then restarted.
Tip
Extreme Networks supports RSMLT-Edge for both IPv4 and IPv6 on the VSP series. For
IPv6, RSMLT-Edge is currently only supported with GRT IPv6 interfaces not VRF IPv6
interfaces.
Tip
Prefer RSMLT-Edge over VRRP Backup-Master when the user VLAN will always remain
localized to a single SMLT cluster (i.e., it will never be L2 VSN extended to other SMLT
clusters).
DVR On Campus SMLT Distribution
DVR is mostly geared around providing anycast default gateway functionality and host-based IP routing
within the Fabric Connect data center. It can however be used as an alternative to either VRRP or RSMLT-
Edge gateway redundancy.