成长值: 65015
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题目为考生回忆内容,仅供参考2 M* D+ i( F4 {; E7 s4 e0 X) o b
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1. Answer : Divide and and conquer! r- Q3 x9 f; z: `2 O' Z/ e- `+ D
2. D&D : gre over ipsec
2 b2 \5 T8 C& F0 f– about up / up , up/down , down / down , down / ?3 d y9 I8 Y6 H) p$ l) ?
3 N ~+ w' Z' R \$ o7 MThere are four possible states in which a GRE tunnel interface can be:
) Q* G4 O4 P; |! p! N. N1 @, MUp/up – This implies that the tunnel is fully functional and passes traffic. It is both administratively up and it’s protocol is up as well.' @9 t& Q" i8 t( ^9 o
Administratively down/down – This implies that the interface has been administratively shut down.
: R) q, n2 S* I nUp/down – This implies that, even though the tunnel is administratively up, something causes the line protocol on the interface to be down.$ {& q/ _% _# } `) Z& x! h
Reset/down – This is usually a transient state when the tunnel is reset by software. This usually happens when the tunnel is misconfigured with a Next Hop Server (NHS) that is it’s own IP address.7 |& a' s, J. h* t& v
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