Origin; As Path - Dell Force10 Z9000 Configuration Manual

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Figure 22. Multi-Exit Discriminators

NOTE: Configuring the set metric-type internal command in a route-map advertises the IGP cost as MED to

outbound EBGP peers when redistributing routes. The configured set metric value overwrites the default IGP cost. If

the outbound route-map uses MED, it overwrites IGP MED.

Origin

The origin indicates the origin of the prefix, or how the prefix came into BGP. There are three origin codes: IGP, EGP, INCOMPLETE.

Indicates the prefix originated from information learned through an interior gateway protocol.

Indicates the prefix originated from information learned from an EGP protocol, which NGP replaced.

Indicates that the prefix originated from an unknown source.

Generally, an IGP indicator means that the route was derived inside the originating AS. EGP generally means that a route was learned

from an external gateway protocol. An INCOMPLETE origin code generally results from aggregation, redistribution, or other indirect

ways of installing routes into BGP.

In Dell Networking OS, these origin codes appear as shown in the following example. The question mark (?) indicates an origin code

of INCOMPLETE (shown in bold). The lower case letter (i) indicates an origin code of IGP (shown in bold).

Example of Viewing Origin Codes

Dell#show ip bgp

BGP table version is 0, local router ID is 10.101.15.13

Status codes: s suppressed, d damped, h history, * valid, > best

Path source: I - internal, a - aggregate, c - confed-external, r - redistributed, n -

Origin codes: i - IGP, e - EGP, ? - incomplete

*> 7.0.0.0/29

*> 7.0.0.0/30

*> 9.2.0.0/16

The AS path is the list of all ASs that all the prefixes listed in the update have passed through.

The local AS number is added by the BGP speaker when advertising to a eBGP neighbor.

Border Gateway Protocol IPv4 (BGPv4)