track 100 inter f0/1 line-protocol

dear all,
simple questions.

1. track 1 inter f0/1 line-protocol : is to track if the line protocol up
or down right ?

R2#sh int f0/1
FastEthernet0/1 is up, *line protocol is up *
  Hardware is Gt96k FE, address is c202.05f9.0001 (bia c202.05f9.0001)
  Internet address is 20.0.0.2/24
  MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 10Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:02, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     41375 packets input, 4654088 bytes
     Received 4927 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     26927 packets output, 2910110 bytes, 0 underruns
     0 output errors, 0 collisions, 11 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

what about

track 100 int f0/1 ip routing ??

what is tracked ?

R3(config)#do sh ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static
route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     20.0.0.0/24 is subnetted, 1 subnets
C 20.0.0.0 is directly connected, FastEthernet0/1
     10.0.0.0/24 is subnetted, 1 subnets
C 10.0.0.0 is directly connected, FastEthernet0/0
     202.155.10.0/32 is subnetted, 1 subnets
O IA 202.155.10.1 [110/11] via 20.0.0.10, 00:19:37, FastEthernet0/1

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Received on Sun Aug 01 2010 - 17:16:50 ART