CCNP Routing - BGP

Card Set Information

Author:
mvou
ID:
311899
Filename:
CCNP Routing - BGP
Updated:
2015-11-22 18:36:52
Tags:
CCNP
Folders:
networking
Description:
CCNP Routing BGP
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  1. You are setting up BGP using loopback interfaces, what do you need to consider?-
    • - Router ID
    • - ebgp-multihop
    • - next-hop-self/routing to that potential next hop
  2. BGP States
    • - Idle - Nothing
    • - Connect - Try to establish TCP
    • - Active - TCP established
    • - OpenSent - BGP Open Sent
    • - OpenConfirm - BGP Open received, keepalive next
    • - Established - Parameters good
  3. BGP Port
    TCP/179
  4. Prefix/length format
    NLRI (Network Layer Reachability Information)
  5. Metric?
    Path Attributes
  6. eBGP and iBGP administrative distance?
    • eBGP - 20
    • iBGP - 90
  7. What is BGP Synchronization?
    • BGP will not advertise something that it
    • learns from an IBGP neighbor to an EBGP neighbor if the prefix can't be
    • validated in its IGP. Default = Off
  8. How is a BGP router-id chosen?
    • 1. Configured (bgp router-id)
    • 2. Highest loopback
    • 3. Highest other interface
  9. Explain ebgp multihop
    By default an advertisement is set with IP TTL of 1. When a loopback interface is used this consumes one hop so TTL must be set to 2
  10. In what situation is next-hop-self required?
    If a iBGP neighbor of a border router does not know how to reach the next hop (external router id)
  11. Why is a Full Mesh now required in most modern networks?
    Traffic routed through the network may get dropped as an internal router does not learn the route
  12. What commands are used to create a peer group?
    • router> neighbor NAME peer-group
    • router> neighbor x.x.x.x peer-group NAME
  13. What are the well known mandatory attributes?
    • Weight
    • AS Path
    • Next Hop
  14. What are the well known non-mandatory attributes?
    • Local Pref
    • Atomic Aggregate
  15. What are the optional transitive attributes?
    • Aggregation
    • Community
  16. What are the optional non-transitive attributes?
    • MED
    • Originator ID
    • Cluster list
  17. How is aggregation applied (3 ways)?
    • - Through IGP if redistributed into BGP
    • - Through a null static route
    • - Through the aggregate-address command
  18. What are the 4 types of BGP message
    • Open
    • Keepalive
    • Update
    • Notification
  19. What does each attribute mean, how would you influence it?

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