如何让EIGRP支持64bit的Metric

在默认情况下，思科路由器只支持32bit的metric计算方法。如果要让路由器支持64bit的metric计算，那么，就用使用named configuration的配置方法。

AS Number配置方法和Named 配置方法，还是有不少区别的。

EIGRP AS Number Configuration

R16#sh run | s eigrp
router eigrp 45678
network 123.16.16.16 0.0.0.0
network 123.20.1.2 0.0.0.0
network 123.20.1.17 0.0.0.0
R16#

EIGRP Named Configuration

R16#sh run | s eigrp
router eigrp lab
!
address-family ipv4 unicast autonomous-system 45678
!
topology base
exit-af-topology
network 123.16.16.16 0.0.0.0
network 123.20.1.2 0.0.0.0
network 123.20.1.17 0.0.0.0
exit-address-family
R16#

R16#
R16#show eigrp protocols
EIGRP-IPv4 Protocol for AS(45678)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 123.16.16.16
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1

R16#sh run | s eigrp
router eigrp 45678
network 123.16.16.16 0.0.0.0
network 123.20.1.2 0.0.0.0
network 123.20.1.17 0.0.0.0
R16#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R16(config)#no router eigrp 45678
R16(config)#router eigrp lab
R16(config-router)#add
R16(config-router)#address-family ?
ipv4  Address family IPv4
ipv6  Address family IPv6

R16(config-router)#address-family ipv4 ?
autonomous-system  Specify Address-Family Autonomous System Number
multicast          Address Family Multicast
unicast            Address Family Unicast
vrf                Specify a specific virtual routing/forwarding instance

R16(config-router)#address-family ipv4 as
R16(config-router)#address-family ipv4 au
R16(config-router)#address-family ipv4 autonomous-system 45678
R16(config-router-af)#ne
R16(config-router-af)#net
R16(config-router-af)#network 123.16.16.16 0.0.0.0
R16(config-router-af)#network 123.20.1.2 0.0.0.0
R16(config-router-af)#network 123.20.1.2 0.0.0.0
*Nov 13 19:23:06.169: %DUAL-5-NBRCHANGE: EIGRP-IPv4 45678: Neighbor 123.20.1.3 (Ethernet0/1) is up: new adjacency
*Nov 13 19:23:06.169: %DUAL-5-NBRCHANGE: EIGRP-IPv4 45678: Neighbor 123.20.1.1 (Ethernet0/1) is up: new adjacency
R16(config-router-af)#network 123.20.1.17 0.0.0.0
R16(config-router-af)#
*Nov 13 19:23:10.993: %DUAL-5-NBRCHANGE: EIGRP-IPv4 45678: Neighbor 123.20.1.18 (Ethernet0/2) is up: new adjacency
R16(config-router-af)#
R16(config-router-af)#end
R16#
R16#show ipr
*Nov 13 19:23:15.782: %SYS-5-CONFIG_I: Configured from console by console
R16#show ip route eigrp
Codes: L - local, 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, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override

Gateway of last resort is not set

123.0.0.0/8 is variably subnetted, 10 subnets, 2 masks
D        123.15.15.15/32 [90/3584000] via 123.20.1.1, 00:00:09, Ethernet0/1
D        123.17.17.17/32 [90/3584000] via 123.20.1.18, 00:00:09, Ethernet0/2
D        123.20.1.8/29 [90/1536000] via 123.20.1.18, 00:00:09, Ethernet0/2
[90/1536000] via 123.20.1.1, 00:00:09, Ethernet0/1
D        123.55.55.55/32 [90/3584000] via 123.20.1.3, 00:00:09, Ethernet0/1
D        123.66.66.66/32 [90/4096000] via 123.20.1.18, 00:00:09, Ethernet0/2
[90/4096000] via 123.20.1.1, 00:00:09, Ethernet0/1
R16#wr
Building configuration...
[OK]
R16#show eigr
R16#show eigrp pro
R16#show eigrp protocols
EIGRP-IPv4 VR(lab) Address-Family Protocol for AS(45678)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0 K6=0
Metric rib-scale 128
<strong><u>  Metric version 64bit</u></strong>
NSF-aware route hold timer is 240
Router-ID: 123.16.16.16
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Total Prefix Count: 8
Total Redist Count: 0

R16#show ip pro
R16#show ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
Sending updates every 0 seconds
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 32
Routing for Networks:
Routing Information Sources:
Gateway         Distance      Last Update
Distance: (default is 4)

Routing Protocol is "eigrp 45678"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP-IPv4 VR(lab) Address-Family Protocol for AS(45678)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0 K6=0
Metric rib-scale 128
<strong><u>    Metric version 64bit</u></strong>
NSF-aware route hold timer is 240
Router-ID: 123.16.16.16
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Total Prefix Count: 8
Total Redist Count: 0

Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
123.16.16.16/32
123.20.1.2/32
123.20.1.17/32
Routing Information Sources:
Gateway         Distance      Last Update
123.20.1.3            90      00:01:22
123.20.1.1            90      00:01:23
123.20.1.18           90      00:01:22
Distance: internal 90 external 170

R16#
R16#