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Why is GRE tunnel showing Tunnel down and line protocol up?

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TitleWhy is GRE tunnel showing Tunnel down and line protocol up?
Question
NetIron#sh int tunnel 2
Tunnel2 is
down, line protocol is up
Hardware is Tunnel

Tunnel source X.X.200.149
Tunnel destination is X.X.200.145
Tunnel mode gre ip
Port name is VCAG1SVCAG2-TL:VCA-SGW1(Gi3/10):VCA-SA2A(e4/1):KG175A:1000MB:TUNNEL2:Cisco_Brocade
Internet address is: X.X.64.30/30
Tunnel TOS 0, Tunnel TTL 255, Tunnel MTU 1376 bytes
Keepalive is Enabled : Interval 10, No.of Retries 3
Total Keepalive Pkts Tx: 539, Rx: 539
Environment
Answer
The GRE tunnel can show "tunnel down and line protocol up" in the following scenarios:
  • Cannot find destination route or route points to Management Interface
  • Configured Keepalive is down
  • If the source IP is loopback/VE and if IP interface is disabled
  • Source IP is physical port and physical port is not up
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