Users Guide

• NA messages are almost always sent in response to an NS message from a node. In this case the solicited NA has the destination
address field set to the unicast MAC address of the initial NS sender. This solicited NA need to be tunneled when they reach the
wrong peer.
Consider a sample scenario in which two VLT nodes, Unit1 and Unit2, are connected in a VLT domain using an ICL or VLTi link. To the
south of the VLT domain, Unit1 and Unit2 are connected to a ToR switch named Node B. Also, Unit1 is connected to another node, Node
A, and Unit2 is linked to a node, Node C. When an NS traverses from Unit2 to Node B(TOR) and a corresponding NA reaches Unit1
because of LAG hashing , this NA must be tunneled to Unit 2 along with some control information. The control information present in the
tunneled NA packet is processed in such a way that the ingress port is marked as the link from Node B to Unit 2 rather than pointing to
ICL link through which tunneled NA arrived.
Figure 132. Sample Configuration of IPv6 Peer Routing in a VLT Domain
Sample Configuration of IPv6 Peer Routing in a VLT
Domain
Consider a sample scenario as shown in the following figure in which two VLT nodes, Unit1 and Unit2, are connected in a VLT domain
using an ICL or VLTi link. To the south of the VLT domain, UNit1 and Unit2 are connected to a ToR switch named Node B. Also, Unit1 is
connected to another node, Node A, and Unit2 is linked to a node, Node C. The network between TOR to VLT Nodes is purely L2 in
nature. Servers or hosts that are connected to the ToR (Node B) generate the L3 control/data traffic from the South or lower-end of the
vertically-aligned network.
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Virtual Link Trunking (VLT)