Configuración bgp

BGP

PART 1
Attribute Types Must be supported and propagated Must be supported; propagation optional

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About BGP Type Path Vector eBGP AD 20 iBGP AD 200 Standard RFC 4271Protocols IP Transport TCP/179 Authentication MD5 Terminology Autonomous System (AS)
A logical domain under the control of a single entity

Well-known Mandatory

Well-known Discretionary OptionalTransitive

Marked as partial if unsupported by neighbor Deleted if unsupported by neighbor Attributes

Optional Nontransitive

Name Type

Description

Aggregator OT AS Path WM Atomic Aggregate WDCluster ID ON Community OT Local Preference WD Multiple Exit ON Discriminator (MED) Next Hop WM Origin WM Originator ID ON Weight O

ID and AS of router which performed summarization List ofautonomous systems which the advertisement has traversed Includes ASes which have been dropped due to route aggregation Originating cluster Route tag Metric for internal neighbors to reach externaldestinations (default 100) Metric for external neighbors to reach the local AS (default 0) External peer in neighboring AS Origin type (IGP, EGP, or unknown) Identifies a route reflector Cisco proprietary, notcommunicated to peers (default 0) Path Selection

External BGP (eBGP)
BGP adjacencies which span autonomous system boundaries

Internal BGP (iBGP)
BGP adjacencies formed within a singleautonomous system

Synchronization Requirement
A route must be known by an IGP before it may be advertised to BGP peers

Packet Types Open Keepalive Update Notification

Neighbor States
PreferenceAttribute

Description

Idle

Neighbor is not responding Attempting to connect TCP session established Open message sent Response received

1 Weight 2 Local Preference 3 Self-originated 4 ASPath 5 Origin 6 MED 7 External 8 IGP Cost 9 eBGP Peering 10 Router ID

Administrative preference Communicated between peers within an AS Prefer paths originated locally Minimize AS hops Prefer...