邊做邊學，順便留個筆記，若有錯誤請不吝指教。
Junos基本操作及root密碼設定可參考我之前的文章：Juniper Junos基本操作、root密碼設定
Juniper基本介面命名規則等內容可以查看這篇：Juniper Junos網路介面(interface)基本介紹(一)
所有Juniper相關文章列表：Juniper JunOS 系列文章列表
這裡列出一些常用的Juniper介面指令：
show interface <terse | brief | detail | extensive>
四條指令都能顯示出介面資訊，資訊的詳細程度依序遞增。
也可以在指令後再加上介面編號來查詢特定介面的資訊：
root> show interfaces ge-0/0/23
Physical interface: ge-0/0/23, Enabled, Physical link is Down
Interface index: 671, SNMP ifIndex: 553
Description: 10.0.0.1/30
Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Link-mode: Half-duplex,
Speed: Auto, Duplex: Auto, BPDU Error: None, Loop Detect PDU Error: None,
MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
Flow control: Disabled, Auto-negotiation: Enabled, Remote fault: Online,
Media type: Copper, IEEE 802.3az Energy Efficient Ethernet: Disabled
Device flags : Present Running Down
Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Current address: 64:c3:d6:66:76:1a, Hardware address: 64:c3:d6:66:76:1a
Last flapped : 1970-01-01 00:03:38 UTC (00:22:28 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : LINK
Active defects : LINK
Interface transmit statistics: Disabled
Logical interface ge-0/0/23.0 (Index 576) (SNMP ifIndex 560)
Flags: Device-Down SNMP-Traps 0x4004000 Encapsulation: ENET2
Input packets : 0
Output packets: 0
Protocol inet, MTU: 1500
Flags: Sendbcast-pkt-to-re
Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
Destination: 10.0.0.0/30, Local: 10.0.0.2, Broadcast: 10.0.0.3在查詢介面IP資訊時使用terse較為好用，可以用來查詢單一介面或是全部介面：
root> show interfaces terse ge-0/0/23
Interface Admin Link Proto Local Remote
ge-0/0/23 up down
ge-0/0/23.0 up down inet 10.0.0.2/30若要查詢到介面的CRC錯誤資訊則需要用到最詳細的extensive(因為資訊太多，將Error資訊的部分過濾出來也是一個實用的技巧)：
root> show interfaces extensive ge-0/0/23 | match errors
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0,
L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0,
FIFO errors: 0, Resource errors: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0,
FIFO errors: 0, HS link CRC errors: 0, MTU errors: 0, Resource errors: 0
CRC/Align errors 0 0
FIFO errors show interface descriptions可以查看各介面的說明，若有好好維護介面的說明資訊這條指令也是相當好用：
root> show interfaces descriptions
Interface Admin Link Description
ge-0/0/23 up down 10.0.0.1/30