Sunday, July 27, 2014

Section 2: IPv4 IGP Protocols (24 Points) of CCIE V5 Routing and Switching Configuration Lab




 Section 2.1: OSPF  No loopback networks should be advertised as host routes. (1 point)


Router1
Router1(config)#router ospf 1
Router1(config-router)#network 1.1.1.0 0.0.0.255 area 0
!--- configures interface serial 1/0 under OSPF area 0.

Router2
Router2(config)#router ospf 1
Router2(config-router)#network 1.1.1.0 0.0.0.255 area 0
!--- configures interface serial 1/0 under OSPF area 0.


Router1(config)#int loopback 0
Router1(config-if)#ip ospf 1 area 0
 !--- configures interface loopback0  under OSPF process id 1 area 0.
Router2(config)#int loopback 0
Router2(config-if)#ip ospf 1 area 0
!--- configures interface loopback 0 under OSPF process id 1 area 0.



Commands  output:
After adding the loopback interface results:

Router1#show ip route
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, + - replicated route

Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Serial1/0
L        1.1.1.2/32 is directly connected, Serial1/0
      2.0.0.0/32 is subnetted, 1 subnets
O        2.2.2.2 [110/65] via 1.1.1.1, 00:02:06, Serial1/0
      3.0.0.0/32 is subnetted, 1 subnets
C        3.3.3.3 is directly connected, Loopback0

Router1#show ip ospf interface loopback 0
Loopback0 is up, line protocol is up
  Internet Address 3.3.3.3/32, Area 0
  Process ID 1, Router ID 3.3.3.3, Network Type LOOPBACK, Cost: 1
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           1         no          no            Base
  Enabled by interface config, including secondary ip addresses
  Loopback interface is treated as a stub Host ----------- interface loopback 0 is advertised as a hosts.

with the ip ospf network point-to-point command result under loopback 0:

Router1#config t
Router1(config)#int loopback 0
Router1(config-if)#ip ospf network point-to-point

Router1#show ip ospf interface loopback 0
Loopback0 is up, line protocol is up
  Internet Address 3.3.3.3/32, Area 0
  Process ID 1, Router ID 3.3.3.3, Network Type POINT_TO_POINT, Cost: 1
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           1         no          no            Base
  Enabled by interface config, including secondary ip addresses
  Transmit Delay is 1 sec, State POINT_TO_POINT
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 2/2, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 0, Adjacent neighbor count is 0
  Suppress hello for 0 neighbor(s)

No comments:

Post a Comment