base on following results from route-views
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route-views>sh ip bgp 2.22.0.1 bestpath
BGP routing table entry for 2.22.0.0/22, version 68416201
Paths: (39 available, best #35, table default)
Not advertised to any peer
Refresh Epoch 1
393406 1299
162.243.188.2 from 162.243.188.2 (162.243.188.2)
Origin IGP, localpref 100, valid, external, best
Community: 1299:1000 1299:30000 1299:30200
rx pathid: 0, tx pathid: 0x0
route-views>trace 2.22.0.1
Type escape sequence to abort.
Tracing the route to 2.22.0.1
VRF info: (vrf in name/id, vrf out name/id)
1 vl-51.uonet1-gw.uoregon.edu (128.223.51.2) [AS 3582] 50 msec 1 msec 48 msec
2 2.bundle-ether10.uonet10-gw.uoregon.edu (128.223.2.10) [AS 3582] 51 msec 49 msec 50 msec
3 eugn-car1-gw.nero.net (207.98.68.177) [AS 3701] 1 msec 1 msec 1 msec
4 eugn-core1-gw.nero.net (207.98.64.161) [AS 3701] 1 msec 51 msec 68 msec
5 te-4-4.car1.Sacramento1.Level3.net (4.53.200.1) [AS 3356] 49 msec 51 msec 49 msec
6 sjo-b21-link.telia.net (213.248.98.29) [AS 1299] 49 msec 52 msec 49 msec
7 nyk-bb2-link.telia.net (213.155.133.238) [AS 1299] 167 msec
nyk-bb2-link.telia.net (80.91.245.97) [AS 1299] 99 msec
nyk-bb2-link.telia.net (80.91.254.176) [AS 1299] 102 msec
8 kbn-bb4-link.telia.net (213.155.134.53) [AS 1299] 199 msec
kbn-bb4-link.telia.net (62.115.118.199) [AS 1299] 195 msec
kbn-bb4-link.telia.net (213.248.82.102) [AS 1299] 249 msec
9 s-bb3-link.telia.net (62.115.139.61) [AS 1299] 201 msec
s-bb4-link.telia.net (62.115.120.59) [AS 1299] 206 msec 245 msec
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as you can see , the "show ip bgp " display that the AS number before destination AS is 393406 , but when we trace the same prefix ,the result dispaly AS=3356 before destination ASN.
why?
thanks in advance.