6. Consider the AS topology in text Figure 5.12 (p. 403). Ignore the network edg
ID: 3600353 • Letter: 6
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6. Consider the AS topology in text Figure 5.12 (p. 403). Ignore the network edges that are not fully shown and suppose that prefix 130.115.240/24 is accessible from AS1 host la via route [AS3 AS5 AS7] and AS1 host 1b via route [AS2 AS9 AS13], although nodes in AS1 will not know this unless AS3 and AS2's gateway nodes 3a and 2a advertise this. Briefly answer, with justification, the following questions. (a) What is the AS level route selected by router 1c to reach prefix 130.115.240/24 assuming that AS1 uses OSPF with all link costs set to 1 for intra-AS routing, BGP for inter-AS routing and AS1 is a customer of both AS2 and AS3? (b) What AS level route is selected by la if AS1 is instead a customer of AS2 and a peer of AS3? (c) Suppose further that router 2b also maintains a BGP session with AS1. What BGP route attribute wil AS2 use to tell AS1 that it (AS2) prefers to receive traffic through 2b as opposed to 2a? Hint: The answer is not NEXT-HOP. Skim router manufacturer Cisco's summary of the available BGP attributes, at http://docwiki.cisco.com/wiki/Border.Gateway Protocol-BGP Attributes, to review the alternatives. (d) Is prefix 130.115.240/24 multi-homed? Why or why not?Explanation / Answer
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