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Home Documentation Junos OS Junos CLI Reference CLI Reference S

Junos CLI Reference

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Junos CLI Reference
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show as-path

date_range 19-Nov-23
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Syntax

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show as-path 
<brief | detail>
<logical-system (all | logical-system-name)>

Syntax (EX Series Switches)

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show as-path 
<brief | detail>

Description

Display the distribution of autonomous system (AS) paths that the local routing device is using (usually through the routing table). Use this command to debug problems for AS paths and to understand how AS paths have been manipulated through a policy (through the as-path-prepend action) or through aggregation.

AS paths are stored in a hash table. A hash table is one method for fast lookup. Each entry in the table is called a bucket. Junos OS computes a hash value that indicates in which bucket the AS path is stored. The AS paths are dispersed among the hash buckets so that a manageable number of AS paths is stored in each bucket. Only unique AS paths are stored. Duplicate AS paths increase a reference count, but do not increase the number of AS paths stored in the hash table.

Options

none

Display basic information about AS paths that the local routing device is using (same as brief).

brief | detail

(Optional) Display the specified level of output.

logical-system (all | logical-system-name)

(Optional) Perform this operation on all logical systems or on a particular logical system.

Required Privilege Level

view

Output Fields

Table 1 lists the output fields for the show as-path command. Output fields are listed in the approximate order in which they appear.

Table 1: show as-path Output Fields

Field Name

Field Description

Level of Output

Total AS paths

Total number of AS paths.

brief none

Bucket

Bucket number.

All levels

Count

Number of AS path entries in this bucket.

All levels

AS path

AS path through which the route was learned. The letters at the end of the AS path indicate the path origin, providing an indication of the state of the route at the point at which the AS path originated:

  • I—IGP.

  • E—EGP.

  • ?—Incomplete; typically, the AS path was aggregated.

  • Atomic—Route is an aggregate of several route prefixes.

  • Aggregator—Routing device has summarized a range of prefixes.

All levels

domain

Number of independent AS domains. The AS paths of an independent AS domain are not shared with the AS paths and AS path attributes of other domains, including the master routing instance domain.

detail

neighbor as

AS peer address.

detail

length

Length of the AS path.

detail

segments

Length of the AS segment descriptor.

detail

unique-count

Number of unique autonomous systems (ASs) present in the AS path

detail

references

Path reference count.

detail

Sample Output

show as-path

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user@host> show as-path
Total AS paths: 30382
  Bucket 0    Count: 36
    I
    14203 2914 174 31752 I
    14203 2914 701 21512 I
    14203 2914 1239 26632 I
    14203 2914 1239 29704 I
    14203 2914 4323 10248 I
    14203 2914 4766 23560 I
    14203 2914 6395 32776 I
    14203 2914 7911 11272 I
    14203 2914 12180 18440 I
    14203 2914 17408 17416 I
    14203 2914 701 702 24586 I
    14203 2914 1239 4657 9226 I
    14203 2914 1239 7132 16394 I
    14203 2914 1299 8308 34826 I
    14203 2914 3320 5603 28682 I
    14203 2914 3491 1680 33802 I
    14203 2914 3549 7908 27658 I
    14203 2914 3549 20804 30730 I
    14203 2914 7018 2687 9226 I
    14203 2914 174 9318 9318 23564 I
    14203 2914 701 3786 3786 23564 I
    14203 2914 701 4761 4795 9228 I
    14203 2914 1239 7132 5673 18444 I
    14203 2914 3491 20485 24588 24588 I
    14203 2914 5511 2200 1945 2060 I
    14203 2914 7911 14325 14325 14348 I
    14203 2914 701 4637 9230 9230 9230 I
    14203 2914 6395 14 14 14 14 I
    14203 2914 9299 6163 6163 6163 6163 9232 I
    14203 2914 3356 3356 3356 3356 3356 11955 21522 I
    14203 2914 9837 9837 9219 I Aggregator: 9219 202.27.91.253
    14203 2914 174 30209 30222 30222 30222 ?
    14203 2914 1299 5377 I (Atomic) Aggregator: 5377 193.219.192.22
    14203 2914 4323 36097 I (Atomic) Aggregator: 36097 216.69.252.254
    14203 2914 209 2516 17676 23813 I (Atomic) Aggregator: 23813 219.127.233.66
  Bucket 1    Count: 28
    14203 2914 35847 I
    14203 2914 174 19465 I
    14203 2914 174 35849 I
    14203 2914 2828 32777 I
    14203 2914 4323 14345 I
    14203 2914 4323 29705 I
    14203 2914 6395 32777 I

...

show as-path detail

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user@host> show as-path detail    
Total AS paths: 30410
  Bucket 0    Count: 36
    AS path: I
      domain 0, length 0, segments 0, unique-count 0, references 54
    AS path: 14203 2914 174 31752 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 4, references 2
    AS path: 14203 2914 701 21512 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 4, references 2
    AS path: 14203 2914 1239 26632 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 5, references 2
    AS path: 14203 2914 1239 29704 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 4, references 2
    AS path: 14203 2914 4323 10248 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 6, references 2
    AS path: 14203 2914 4766 23560 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 4, references 2
    AS path: 14203 2914 6395 32776 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 5, references 3
    AS path: 14203 2914 7911 11272 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 6, references 2
    AS path: 14203 2914 12180 18440 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 3, references 3
    AS path: 14203 2914 17408 17416 I
      domain 1, neighbor as: 14203, length 4, segments 1, unique-count 8, references 3
    AS path: 14203 2914 701 702 24586 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 4, references 3
    AS path: 14203 2914 1239 4657 9226 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 5, references 7
    AS path: 14203 2914 1239 7132 16394 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 7, references 2
    AS path: 14203 2914 1299 8308 34826 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 8, references 2
    AS path: 14203 2914 3320 5603 28682 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 4, references 2
    AS path: 14203 2914 3491 1680 33802 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 14, references 2
    AS path: 14203 2914 3549 7908 27658 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 6, references 2
    AS path: 14203 2914 3549 20804 30730 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 24, references 2
    AS path: 14203 2914 7018 2687 9226 I
      domain 1, neighbor as: 14203, length 5, segments 1, unique-count 4, references 3
    AS path: 14203 2914 174 9318 9318 23564 I
      domain 1, neighbor as: 14203, length 6, segments 1, unique-count 4, references 2
    AS path: 14203 2914 701 3786 3786 23564 I
      domain 1, neighbor as: 14203, length 6, segments 1, unique-count 4, references 2
    AS path: 14203 2914 701 4761 4795 9228 I
      domain 1, neighbor as: 14203, length 6, segments 1, unique-count 4, references 14
    AS path: 14203 2914 1239 7132 5673 18444 I
      domain 1, neighbor as: 14203, length 6, segments 1, unique-count 4, references 2
    AS path: 14203 2914 3491 20485 24588 24588 I
      domain 1, neighbor as: 14203, length 6, segments 1, unique-count 4, references 4
    AS path: 14203 2914 5511 2200 1945 2060 I
      domain 1, neighbor as: 14203, length 6, segments 1, unique-count 4, references 2
    AS path: 14203 2914 7911 14325 14325 14348 I
      domain 1, neighbor as: 14203, length 6, segments 1, unique-count 4, references 2
    AS path: 14203 2914 701 4637 9230 9230 9230 I
      domain 1, neighbor as: 14203, length 7, segments 1, unique-count 4, references 3
    AS path: 14203 2914 6395 14 14 14 14 I
      domain 1, neighbor as: 14203, length 7, segments 1, unique-count 4, references 10
...

Release Information

Command introduced before Junos OS Release 7.4.

Related Documentation

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