Network Virtualization using Extreme Fabric Connect

Network Virtualization Using Extreme Fabric Connect
© 2019 Extreme Networks, Inc. All rights reserved. 44
Figure 15 How the SPBM Nick-name is Used to Construct a Multicast BMAC
Another use of the SPBM nick-name is, when configuring IS-IS IP Accept policies, it is possible to single out
IP routes advertised by specific BEB nodes by specifying the BEB’s nick-name. This provides a similar
approach to OSPF Accept policies where OSPF Router IDs are specified.
Dynamic Nick-name Assignment
Dynamic Nick-name assignment (DNN) is the ability for newly provisioned SPB platforms to automatically
obtain an SPB Nick-name if deployed in Zero Touch Fabric (ZTF) mode into an already existing SPB fabric.
The existing SPB fabric needs to be already deployed with one or more SPB core nodes acting as nick-
name servers that can allocate nick-name ids from one of six possible ranges. The newly provisioned node
connects to the reserved Fabric Area Network (FAN) as a nick-name client and obtains a valid nick-name id
from one of the available nick-name servers.
Note
Dynamic Nick-name Assignment is currently only supported on Extreme Networks VSP
platforms.
Note
The six valid Dynamic Nick-name ranges available are:
• Range A: A.00.0A – A.FF.FE (default range)
• Range B: B.00.0A – B.FF.FE
• Range C: C.00.0A – C.FF.FE
• Range D: D.00.0A – D.FF.FE
• Range E: E.00.0A – E.FF.FE
• Range F: F.00.0A – F.FF.FE
Customer VLAN
The Customer VLAN (CVLAN) is a regular VLAN where end-stations and users are located and has all the
traditional VLAN properties that the reader should be familiar with. A CVLAN does MAC learning, belongs
to a Spanning Tree instance and floods Broadcast, Unknown unicasts, and non-snooped Multicast (BUM)
traffic. In the Extreme Fabric Connect architecture, the CVLAN is augmented with the ability to be assigned
to an L2 VSN service I-SID, in which case its L2 broadcast domain is extended across the fabric to reach
other CVLANs located on distant BEBs. In this case, the CVLAN MAC table is also able to do reverse MAC
learning of traffic arriving from the fabric and maintain entries mapping distant CMACs against the distant
BMAC from which they can be attained.
Backbone VLAN
The Backbone VLAN (BVLAN or BVID) is a special VLAN that exists only on SPB NNI ports and where
Ethernet bridging works in a completely novel way. There is no MAC learning performed in a BVLAN and
there is no more flooding of broadcast, multicast, and unknown-unicast packets. SPB forwarding database
entries are instead derived from the node and service identifiers contained within SPB’s IS-IS Link State