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int loop 1 BGP tunnel on Port 179 int loop 1
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Multiple load-shared parallel IP links or multiple router hops not on 19216810/30
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Figure 916 Using eBGP multihop
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You do not need to configure multihop if both BGP speakers are in the same AS, speaking iBGP The other special next hop case has various applications, the most frequent of which is routers on a single point-to-multipoint nonbroadcast multiaccess (NBMA) medium such as Frame Relay or ATM Especially in provider environments, using a separate /30 subnet on point-to-point subinterfaces may not scale, because existing router operating systems can support only a finite number of interfaces In Figure 917, router bay advertises a route that it learned from router anise That route contains the next hop of anise Coriander, however, does not have a virtual circuit giving it connectivity to anise Coriander cannot send directly to anise By using NEXT_HOP_SELF, you force bay to put its own address, rather than that of anise, into the update Since coriander does have a virtual circuit to bay, everything will then work The underlying reason for the formal standard s restriction on NEXT_HOP is avoiding loops A BGP speaker must not:
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Advertise the address of a peer as the NEXT_HOP of a route the current speaker is originating to that peer Install a route that has itself as the next hop, unless the NEXT_HOP_SELF configuration option is used
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MULTI_EXIT_DISC (Type Code 4)
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Originally called the INTER_AS_METRIC in BGP-3, this is used only in eBGP Officially it is used to compare otherwise identical eBGP routes to the same directly connected AS The lower the MED value, the more preferred the route
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Router anise 19216812
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19216811 Router bay
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19216813 Router coriander
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Figure 917 Using NEXT_HOP_SELF
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Basic BGP and the Customer Side of Exterior Routing
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will be Industry practice has introduced additional applications for the MED, where, under certain circumstances, it can be used to compare routes from different but still directly connected ASs
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LOCAL_PREF (Type Code 5)
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Local preference is a route preference attribute with a scope of a single AS, so it is used only in iBGP It is well known and discretionary The higher the local preference value, the more preferred the route Remember that the rule for preference is opposite between MED and LOCAL_PREF Routes with high LOCAL_PREFs but low MEDs are preferred
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ATOMIC_AGGREGATE (Type Code 6) and AGGREGATOR (Type Code 7)
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Both these attributes deal with address aggregation The first indicates that an AS, for policy reasons of its own, is passing a less specific rather than a more specific route ATOMIC_AGGREGATE is well-known, discretionary, and of length 0 AGGREGATOR is an optional transitive attribute 6 bytes in length, which contains the last AS number that formed the aggregate route (encoded as two octets), followed by the IP address of the BGP speaker that formed the aggregate route encoded as four octets) NEW BGP speakers generate the AGGREGATOR attributes with the AS information encoded as 32 bits
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COMMUNITIES (Type Code 8) and EXTENDED COMMUNITIES (Type Code 16)
A given route can belong to one or more communities, which are routes that share some common property For example, an academic network that handles both academic and commercial traffic under an acceptable use policy might set a community attribute on the university updates; this community attribute value would indicate that the route meets the acceptable use policy The same route can be tagged with more than one community A given route, for example, might belong to both the US Energy Department ESnet and the European high-energy research network Conseil Europ en pour la Recherche Nucle ire (CERN) An excellent term occasionally used for communities is that they color routes Think of policies where you could simply say, Advertise all red routes to AS1, advertise no blue routes to AS-SET 3, and accept only green routes from router 1234 of AS2
ROUTE SETS VERSUS COMMUNITIES Both RPSL route sets and BGP community attributes identify groups of routes The route set name, however, is an abstraction, while the community identifier actually travels with the route