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1.1 Troubleshooting Layer 2
5 L) d3 L. h. K, `initial Faults
' @; i5 G( J" G8 L- |, \; xshow run | inc access-list|access-group|class-map|policy-map|route-map|control|backup 1 }, n+ J% Z- T! g
show run | inc span|vtp|trunk|filter
! m! b7 m% X1 N9 y3 z; bSW1
$ Q' a: k4 g( H) u4 Z+ q" sno vlan filter OSPF vlan-list 1-4094 & p- l( e) D$ x8 L+ z3 a
SW1/SW2
4 A* ]$ N# M' _ ?( Z) Hint range fa0/19-24 * Z3 p' ~/ g0 I4 l2 P8 D
no spanning-tree portfast trunk
7 h. U; g6 H4 Son all devices ) k9 f5 c1 `( ?9 a; n0 t. p7 z
ip cef
' n7 C% V$ X0 c7 h* H" KR1/R2 $ X- {+ [1 R) w+ G4 b+ N% y" {
no ppp neighbor-route
! B. t3 G3 \& C, p. R9 l4 p5 T8 T) @+ q, p: ~/ x9 F2 m
$ T3 J3 |7 W l- K) u
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