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 eld 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 142. Sample Conguration of IPv6 Peer Routing in a VLT Domain
Sample Conguration of IPv6 Peer Routing in a VLT Domain
Consider a sample scenario as shown in the following gure 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 trac from the South or lower-end
of the vertically-aligned network.
Virtual Link Trunking (VLT)
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