preference
Explanation:
BGP routes have a variety of path attributes that describe their characteristics and influence route selection.
These attributes include well-known mandatory attributes like AS-PATH and NEXT-HOP, as well as optional attributes like MED and LOCAL_PREF.
In Huawei devices, there is a Huawei-specific attribute called "preference", which is a local parameter used to influence BGP route selection on the device.
* Key Characteristics of "preference":
* It is valid only locally on the router.
* It is not shared with BGP peers.
* It helps the router determine the best route when multiple routes exist for the same prefix.
* It appears in the BGP routing table output in lowercase as preference.
Thus, the correct answer is preference (entered in lowercase as required).
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "BGP Attributes".