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Advanced MPLS Design and Implementation by Vivek Alwayn

By Vivek Alwayn

I have to admit that i used to be relatively puzzled by way of this ebook. MPLS isn't my most powerful quarter of analysis - this publication didn't support my development of data. this isn't a booklet to learn from cover-to-cover, yet most sensible learn because the specifications come up. i believe the writer used to be rather biased in the direction of 'pro-Cisco'. i didn't see any point out of the functionality degradations which could accompany MPLS implementations. additionally, i feel the booklet wanted a 2d grammatical editor, because the total 'flow' of the ebook used to be nonevident. I provide this publication three pings out of five: !!..!

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The ILMI assumes that each ATM device that is supporting at least one UNI has a UNI Management Entity (UME) associated with each UNI. Network management information is then communicated between UMEs, as shown in Figure 2-13. The protocol chosen for the ILMI communication is the Simple Network Management Protocol (SNMP), which is designated as SNMP/AAL. At the ATM layer, one VCC is provisioned for this ILMI communication, with a default VPI/VCI = 0/16. Figure 2-13. ATM Interim Local Management Interface (ILMI) The management information defined by the ILMI provides status and configuration information from the UME regarding the UNI.

Figure 3-5. Packet-Based LSR Operation with a Multi-Level Stack Penultimate Hop Popping The packet-based LSR operation described in the preceding section has certain drawbacks associated with the double lookup performed at the egress LSR4. LSR4 would need to examine the label stack and look up the label in its LFIB, only to realize that it needs to be popped. It then would need to perform a Layer 3 lookup in its global or VPN-specific routing table in order to correctly forward the packet to the external next-hop router.

The BPX 8650 is an example of an ATM-LSR that needs an external LSC. The LSC is physically implemented as a 7200 or 7500 router connected to the BPX over an OC3 ATM interface. The Virtual Switch Interface (VSI) protocol runs between the LSC, and the ATM switch supports the MPLS control plane, which uses the control virtual circuit (VC) 0/32. The MPLS control VC uses LLC/SNAP encapsulation of IP packets as defined in RFC 1483. The 0/32 control PVC is also used to carry IP routing protocol traffic between the LSC and other ATM LSRs.

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