• Author : John Frame


Tap Aggregration Tip: Popping MPLS tags for Untagged or VLAN based Tools

In Tap Aggregation scenarios common in WAN and Service Provider environments, MPLS tags are present.  Many of the analysis tools do not understand these tags and so the Arista DANZ feature set allows for these to be removed.  This functionality has been around since 4.15.0F however initially had the limitation that the traffic would always be sent out the Tool port with a VLAN tag.  However, some tools not only do not understand MPLS, but also VLAN tags, so this tip describes how to deal with both 802.1q and untagged scenarios. Step 1:  Configure MPLS pop/strip on the Tap port:...
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VMTracer Visibility and Call Flows

Introduction Arista EOS has been supporting the VMTracer feature since vSphere 4.0 was introduced and continues to support the latest version.  The EOS User Manual (found for various releases at https://www.arista.com/en/support/software-download) provides a very good description and background to the feature along with configuration details.  This technical note adds additional call flow information to better understand the feature and the network visibility it provides to operators, as well covering NSX-V visibility details. To set the baseline, the VMTracer logical diagram from the User Manual is redrawn here: This diagram shows that there are up to three main conversations between the Arista...
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