结论：
1>除BGP重分布后metric为1,其它路由协议都默认为20。
2>default-metric cost命令影响所有路由协议重分布过来的metric，包括静态路由。
3>直连路由不受default-metric cost命令影响。
3>所有路由（静态、动态、直连）都受redistribute metric影响。
r1#sh run
Building configuration...
Current configuration : 1024 bytes
!
interface Serial1/0
description conn_to_r2_s1/0_192.168.1.2
ip address 192.168.1.1 255.255.255.0
serial restart-delay 0
!
router ospf 100
router-id 10.0.0.1
log-adjacency-changes
network 192.168.1.0 0.0.0.255 area 0
---------------------------------------------
r2#sh run
Building configuration...
Current configuration : 1393 bytes
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
ip ospf network point-to-point
!
interface FastEthernet0/0
ip address 2.2.2.2 255.255.255.0
duplex auto
speed auto
!
interface Serial1/0
description conn_to_r1_s1/0_192.168.1.1
ip address 192.168.1.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
description conn_to_r3_s1/0_192.168.2.2
ip address 192.168.2.1 255.255.255.0
serial restart-delay 0
!
router ospf 100
router-id 10.0.0.2
log-adjacency-changes
redistribute connected metric 33 subnets
redistribute static subnets
redistribute rip subnets
network 192.168.1.0 0.0.0.255 area 0
default-metric 7
!
router rip
version 2
network 192.168.2.0
no auto-summary
!
ip route 3.3.3.0 255.255.255.0 Serial1/1
-----------------------------------------------
r3#sh run
Building configuration...
Current configuration : 1299 bytes
!
interface Loopback0
ip address 5.5.5.5 255.255.255.0
!
interface Loopback1
ip address 6.6.6.6 255.255.255.0
!
interface Loopback81
ip address 3.3.3.3 255.255.255.0
!
interface Serial1/0
description conn_to_r2_s1/1_192.168.2.1
ip address 192.168.2.2 255.255.255.0
serial restart-delay 0
no dce-terminal-timing-enable
!
router rip
version 2
network 5.0.0.0
network 6.0.0.0
network 192.168.2.0
no auto-summary
----------------------------------------------------
r1#sh ip route
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
1.0.0.0/24 is subnetted, 1 subnets
O E2 1.1.1.0 [110/33] via 192.168.1.2, 00:15:37, Serial1/0
2.0.0.0/24 is subnetted, 1 subnets
O E2 2.2.2.0 [110/33] via 192.168.1.2, 00:15:37, Serial1/0
3.0.0.0/24 is subnetted, 1 subnets
//直连路由
O E2 3.3.3.0 [110/7] via 192.168.1.2, 00:12:03, Serial1/0
5.0.0.0/24 is subnetted, 1 subnets
//静态路由
O E2 5.5.5.0 [110/7] via 192.168.1.2, 00:12:03, Serial1/0
6.0.0.0/24 is subnetted, 1 subnets
O E2 6.6.6.0 [110/7] via 192.168.1.2, 00:12:03, Serial1/0
C 192.168.1.0/24 is directly connected, Serial1/0
//动态路由
O E2 192.168.2.0/24 [110/33] via 192.168.1.2, 00:15:37, Serial1/0
//直连路由
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