Quiz: MLS Topology Example
{"Image DocumentName": "Quiz: MLS Topology Example", "Image ImageDescription": "MLS-RP. Port in Blocking State. S1. X. S2. S3. S4. S7. Slide 1 of 2. Purpose: This slide describes an MLS configuration with multiple Layer 2 paths. Emphasis: This example illustrates MLS in a configuration where multiple Layer 2 paths exist between the source and destination devices and how spanning tree operates with this configuration. As in the previous examples, communication is between Station A to Station B. From a spanning-tree perspective, the link between switches S2 and S3 is in blocking mode. Traffic from Station A to Station B takes the following path: S4\u00aeS2\u00aeS1\u00aeR\u00aeS1\u00aeS3\u00aeS7\u00aeB. The first packet is forwarded along this path and candidate entries are established in S4, S2, and S1. Because this is the first packet in the flow, the frame is forwarded to R, rewritten with the appropriate source and destination headers, and returned to down to S1. The returning packet is the enabling packet, and the entry in the MLS cache of S1 is completed. The packet is then forwarded to S3, S7, and on to Station B. Subsequent packets in this flow are now Layer-3 switched at S1. Because S4 and S2 do not detect an enabling packet, candidate entries created in S4 and S2 age out of those MLS caches. If switch S1 is not a Layer 3 switch, then the packets never bypass the router because it is the only switch that is positioned to detect both the candidate and the enabling packet. Transition: The following completes the discussion of this configuration. S5. S6. A. B. Original MLS path was A\uf0d4 S4\uf0d4 S2\uf0d4 S1\uf0d4 S3\uf0d4 S7\uf0d4B. Spanning tree blocked the link between S1 and S3. What is the next available MLS path?", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}