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- The document is a presentation on BGP concepts including attributes like ORIGIN, NEXT_HOP, and AS_PATH. It discusses how BGP selects the best path and provides examples of attribute values. - It covers using the "show ip bgp" command to view BGP routing table entries and analyze attribute information. Examples are given to illustrate the meaning of attribute codes. - The presentation is based on information from networking books and Cisco documentation, with examples drawn from Cisco's website.

Technology
1 of 107
Ch. 9 – BGP (Part 2) CCNP 1 version 3.0 Rick Graziani Cabrillo College
Note to instructors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Concepts, diagrams, and examples ,[object Object]
Other source, Cisco on-line ,[object Object],[object Object],[object Object]
Implementing Policy ,[object Object],[object Object],[object Object],[object Object],[object Object]
Using BGP Attributes ,[object Object],[object Object],[object Object]
show ip bgp ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],show ip bgp
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],show ip bgp ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BGP Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BGP Best Path Selection Algorithm ,[object Object],[object Object]
Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
The ORIGIN attribute ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The ORIGIN attribute
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The ORIGIN attribute ,[object Object],[object Object],[object Object]
Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
NEXT_HOP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
NEXT_HOP and Multiaccess Media ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],NEXT_HOP and Multiaccess Media ,[object Object],[object Object],[object Object],[object Object],[object Object]
Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
AS_PATH ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],AS_PATH
AS_PATH – private AS numbers ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],AS_PATH – private AS numbers
[object Object],[object Object],[object Object],[object Object],AS_PATH
[object Object],[object Object],[object Object],[object Object],AS_PATH
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],AS_PATH
AS_PATH - prepend ,[object Object],[object Object],[object Object]
AS_PATH – prepend Concept Current “shorter path” New “shorter path”
[object Object],[object Object],[object Object],[object Object],[object Object],AS_PATH – prepend - Example Router C router bgp 300 network 170.10.0.0 neighbor 3.3.3.3 remote-as 200 neighbor 2.2.2.2 remote-as 100 neighbor 2.2.2.2 route-map SETPATH out route-map SETPATH permit 10 set as-path prepend 300 300 route-map
[object Object],[object Object],[object Object],[object Object],The WEIGHT attribute AS 100 AS 200 2000 1000
[object Object],[object Object],[object Object],The WEIGHT attribute RouterC AS 100 2000 AS 200 1000
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The WEIGHT attribute RouterC AS 200 1000 AS 100 2000
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],weight 2000 weight 1000 Higher weight preferred AS 100 2000 AS 200 1000 RouterC
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The WEIGHT attribute weight 2000 weight 1000 AS 100 AS 200 RouterC
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The WEIGHT attribute – Access list FYI
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],weight 2000 weight 1000 AS 100 AS 200 RouterC
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],weight 2000 weight 1000 AS 100 AS 200 RouterC
Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
The LOCAL_PREF Attribute ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],The LOCAL_PREF Attribute ? ? Which exit should all the routers within AS 256 use?
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Higher Local Preference is preferred! Higher Local Preference is preferred! 200 150
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Local Pref = 150 Local Pref = 200 All traffic in AS 256 destined for 170.10.0.0 (and other ASes) Higher Local Preference is preferred!
[object Object],[object Object],[object Object],Local Pref = 150 Local Pref = 200 All traffic in AS 256 destined for 170.10.0.0 (and other AS’s) Higher Local Preference is preferred!
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Local Pref = 150 Local Pref = 200 All traffic in AS 256 destined for 170.10.0.0 (and other AS’s) Higher Local Preference is preferred!
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],AS_PATH Attribute - FYI This command creates a special kind of access list that looks at the AS_PATH attribute.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],AS_PATH Attribute - FYI
Regular Expressions - FYI ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Regular Expressions ,[object Object],Character Description ^ Matches the beginning of the input string. $ Matches the end of the input string. _ Matches a space, comma, left brace, right brace, the beginning of an input string, or the ending of an input stream . Matches any single character * Matches 0 or more single- or multiple-character patterns.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
The MED attribute ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The MED attribute
[object Object],[object Object],Router A router bgp 100 neighbor 2.2.2.1 remote-as 300 neighbor 3.3.3.3 remote-as 300 neighbor 4.4.4.3 remote-as 400 Router B router bgp 400 neighbor 4.4.4.4 remote-as 100 neighbor 4.4.4.4 route-map SETMEDOUT out neighbor 5.5.5.4 remote-as 300 route-map SETMEDOUT permit 10 set metric 50 Router C router bgp 300 neighbor 2.2.2.2 remote-as 100 neighbor 2.2.2.2 route-map SETMEDOUT out neighbor 5.5.5.5 remote-as 400 neighbor 1.1.1.2 remote-as 300 route-map SETMEDOUT permit 10 set metric 120 Router D router bgp 300 neighbor 3.3.3.2 remote-as 100 neighbor 3.3.3.2 route map SETMEDOUT out neighbor 1.1.1.1 remote-as 300 route-map SETMEDOUT permit 10 set metric 200
[object Object],[object Object],RouterA can only compare MEDs from the same AS Router A router bgp 100 neighbor 2.2.2.1 remote-as 300 neighbor 3.3.3.3 remote-as 300 neighbor 4.4.4.3 remote-as 400 Router B router bgp 400 neighbor 4.4.4.4 remote-as 100 neighbor 4.4.4.4 route-map SETMEDOUT out neighbor 5.5.5.4 remote-as 300 route-map SETMEDOUT permit 10 set metric 50 Router C router bgp 300 neighbor 2.2.2.2 remote-as 100 neighbor 2.2.2.2 route-map SETMEDOUT out neighbor 5.5.5.5 remote-as 400 neighbor 1.1.1.2 remote-as 300 route-map SETMEDOUT permit 10 set metric 120 Router D router bgp 300 neighbor 3.3.3.2 remote-as 100 neighbor 3.3.3.2 route map SETMEDOUT out neighbor 1.1.1.1 remote-as 300 route-map SETMEDOUT permit 10 set metric 200
[object Object],Router A router bgp 100 neighbor 2.2.2.1 remote-as 300 neighbor 3.3.3.3 remote-as 300 neighbor 4.4.4.3 remote-as 400 Router B router bgp 400 neighbor 4.4.4.4 remote-as 100 neighbor 4.4.4.4 route-map SETMEDOUT out neighbor 5.5.5.4 remote-as 300 route-map SETMEDOUT permit 10 set metric 50 Router C router bgp 300 neighbor 2.2.2.2 remote-as 100 neighbor 2.2.2.2 route-map SETMEDOUT out neighbor 5.5.5.5 remote-as 400 neighbor 1.1.1.2 remote-as 300 route-map SETMEDOUT permit 10 set metric 120 Router D router bgp 300 neighbor 3.3.3.2 remote-as 100 neighbor 3.3.3.2 route map SETMEDOUT out neighbor 1.1.1.1 remote-as 300 route-map SETMEDOUT permit 10 set metric 200
[object Object],[object Object],Router A router bgp 100 neighbor 2.2.2.1 remote-as 300 neighbor 3.3.3.3 remote-as 300 neighbor 4.4.4.3 remote-as 400 bgp always-compare-med Router B router bgp 400 neighbor 4.4.4.4 remote-as 100 neighbor 4.4.4.4 route-map SETMEDOUT out neighbor 5.5.5.4 remote-as 300 route-map SETMEDOUT permit 10 set metric 50 Router C router bgp 300 neighbor 2.2.2.2 remote-as 100 neighbor 2.2.2.2 route-map SETMEDOUT out neighbor 5.5.5.5 remote-as 400 neighbor 1.1.1.2 remote-as 300 route-map SETMEDOUT permit 10 set metric 120 Router D router bgp 300 neighbor 3.3.3.2 remote-as 100 neighbor 3.3.3.2 route map SETMEDOUT out neighbor 1.1.1.1 remote-as 300 route-map SETMEDOUT permit 10 set metric 200
Path Attributes - FYI Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ATOMIC_AGGREGATE - FYI
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ATOMIC_AGGREGATE - FYI
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ATOMIC_AGGREGATE - FYI
[object Object],[object Object],[object Object],[object Object],[object Object],ATOMIC_AGGREGATE - FYI
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Example 1: Aggregating Local Routes
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Example 1: Aggregating Local Routes
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Example 1: Aggregating Local Routes
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Traceroute.org – www.traceroute.org
[object Object],[object Object],[object Object],What is a Route Server?
Cabrillo – 207.62.184.0 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Geektools.com
Using regular expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
FYI ,[object Object]
BGP Route Filtering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BGP Route Filtering The distribute-list command can be used to filter updates so that AS1 does not receive transit traffic to network 192.69.10.0 /24. RTA filters update to RTC so it does not include the 192.69.10.0/24 network.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RTA filters update to RTC so it does not include the 192.69.10.0/24 network.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RTA filters update to RTC so it does not include the 192.69.10.0/24 network.
BGP Route Filtering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BGP Route Filtering - Prefix lists ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BGP Route Filtering - Prefix lists Parameter Description list-name Specifies the name of a prefix list. seq (Optional) Applies the sequence number to the prefix list entry being created or deleted. seq-value (Optional) Specifies the sequence number for the prefix list entry. deny Denies access to matching conditions. permit Permits access for matching conditions. network /len (Mandatory) The network number and length (in bits) of the network mask. ge (Optional) Applies ge-value to the range specified. ge-value (Optional) Specifies the lesser value of a range (the "from" portion of the range description). le (Optional) Applies le-value to the range specified. le-value (Optional) Specifies the greater value of a range (the "to" portion of the range description).
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Example:
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],BGP Route Filtering - Prefix lists
[object Object],[object Object],[object Object],BGP Route Filtering - Prefix lists
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],BGP Route Filtering - Prefix lists
Default Routes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Default Routes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Symmetry ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Load Balancing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ch. 9 – BGP (Part 2) CCNP 1 version 3.0 Rick Graziani Cabrillo College

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B G P Part2

  • 1. Ch. 9 – BGP (Part 2) CCNP 1 version 3.0 Rick Graziani Cabrillo College
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15. Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
  • 16.
  • 17.
  • 18.
  • 19.
  • 20. Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26. Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
  • 27.
  • 28.
  • 29.
  • 30.
  • 31.
  • 32.
  • 33.
  • 34.
  • 35. AS_PATH – prepend Concept Current “shorter path” New “shorter path”
  • 36.
  • 37.
  • 38.
  • 39.
  • 40.
  • 41.
  • 42.
  • 43.
  • 44.
  • 45. Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
  • 46.
  • 47.
  • 48.
  • 49.
  • 50.
  • 51.
  • 52.
  • 53.
  • 54.
  • 55.
  • 56.
  • 57.
  • 58.
  • 59.
  • 60.
  • 61.
  • 62.
  • 63.
  • 64.
  • 65.
  • 66. Path Attributes Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
  • 67.
  • 68.
  • 69.
  • 70.
  • 71.
  • 72.
  • 73. Path Attributes - FYI Attribute Code Type 1-ORIGIN Well-known mandatory 2-AS_PATH Well-known mandatory 3-NEXT_HOP Well-known mandatory 4-MULTI_EXIT_DISC Optional non-transitive 5-LOCAL_PREF Well-known discretionary 6-ATOMIC_AGGREGATE Well-known discretionary 7-AGGREGATOR Well-known discretionary 8-COMMUNITY Optional transitive (Cisco) 9-ORIGINATOR_ID Optional non-transitive (Cisco) 10-Cluster List Optional non-transitive (Cisco) 11-Destination Preference (MCI) 12-Advertiser (Baynet) 13-rcid_path (Baynet) 255-Reserved [md]
  • 74.
  • 75.
  • 76.
  • 77.
  • 78.
  • 79.
  • 80.
  • 81.
  • 83.
  • 84.
  • 85.
  • 87.
  • 88.
  • 89.
  • 90.
  • 91. BGP Route Filtering The distribute-list command can be used to filter updates so that AS1 does not receive transit traffic to network 192.69.10.0 /24. RTA filters update to RTC so it does not include the 192.69.10.0/24 network.
  • 92.
  • 93.
  • 94.
  • 95.
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  • 97. BGP Route Filtering - Prefix lists Parameter Description list-name Specifies the name of a prefix list. seq (Optional) Applies the sequence number to the prefix list entry being created or deleted. seq-value (Optional) Specifies the sequence number for the prefix list entry. deny Denies access to matching conditions. permit Permits access for matching conditions. network /len (Mandatory) The network number and length (in bits) of the network mask. ge (Optional) Applies ge-value to the range specified. ge-value (Optional) Specifies the lesser value of a range (the "from" portion of the range description). le (Optional) Applies le-value to the range specified. le-value (Optional) Specifies the greater value of a range (the "to" portion of the range description).
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  • 107. Ch. 9 – BGP (Part 2) CCNP 1 version 3.0 Rick Graziani Cabrillo College