[Cisco] Example configuration Load share 2 ADSL lines with NAT and OER/PfR (Optimize Edge Routing)

Example configuration Load share 2 ADSL lines with NAT and OER/PfR (Optimize Edge Routing)


h**p://www.cisco.com/en/US/docs/ios/12_4t/oer/configuration/guide/h_oerstr.html
h**p://www.cisco.com/en/US/docs/ios/12_4t/oer/configuration/guide/h_oerstr.html#wp1054840
h**p://www.netcraftsmen.net/resources/archived-articles/443.html


   +----------ATM0/0/0---------> ADSL line
   |
[192.168.1.1/24]---Fa0/0----[Cisco2811]
   |
   +----------Fa0/1----ADSL modem-------> ADSL line


boot-start-marker
boot system flash:c2800nm-adventerprisek9-mz.124-24.T1.bin
boot-end-marker
!
key chain OER
 key 1
   key-string cisco
!
!
oer master
 no max-range-utilization
 logging
 !
 border 10.0.0.1 key-chain OER
  interface FastEthernet0/0 internal
  interface Dialer0 external
  interface Dialer1 external
 !
 learn
  throughput
  delay
  protocol tcp
  protocol udp
  periodic-interval 3
  monitor-period 2
  aggregation-type prefix-length 32
 delay threshold 20
 backoff 180 360
 mode route control
 mode monitor passive
 mode route metric static tag 60000
!
oer border
 logging
 local Loopback0
 master 10.0.0.1 key-chain OER
!
interface Loopback0
 ip address 10.0.0.1 255.255.255.255
!
interface FastEthernet0/0
 ip address 192.168.1.1 255.255.255.0
 ip flow ingress
 ip nat inside
 ip virtual-reassembly
 ip tcp adjust-mss 1460
 duplex auto
 speed auto
!
interface FastEthernet0/1
 description ## Connect to ADSL modem ##
 no ip address
 duplex auto
 speed auto
 pppoe enable group global
 pppoe-client dial-pool-number 2
!
interface ATM0/0/0
 description ## Connect to ADSL line ##
 no ip address
 no atm ilmi-keepalive
 pvc 0/100 
  pppoe-client dial-pool-number 1
 !        
!
interface Dialer0
 bandwidth 8192
 ip address negotiated
 ip flow ingress
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 load-interval 30
 dialer pool 1
 ppp pap sent-username XXXXX1 password 0 XXXX1
!
interface Dialer1
 bandwidth 4096
 ip address negotiated
 ip flow ingress
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 load-interval 30
 dialer pool 2
 ppp pap sent-username XXXXX2 password 0 XXXX2
!
router ospf 1
 log-adjacency-changes
 redistribute static subnets route-map STATIC->OSPF
 network 10.0.0.1 0.0.0.0 area 0
 network 192.168.1.1 0.0.0.0 area 0
!
ip route 0.0.0.0 0.0.0.0 Dialer0
ip route 0.0.0.0 0.0.0.0 Dialer1
!
ip nat inside source route-map NAT_DSL0 interface Dialer0 overload oer
ip nat inside source route-map NAT_DSL1 interface Dialer1 overload oer
!
access-list 1 permit 10.0.0.0 0.0.0.255
access-list 1 permit 192.168.1.0 0.0.0.255
!
route-map STATIC->OSPF permit 10
 match tag 60000
!
route-map NAT_DSL1 permit 10
 match ip address 1
 match interface Dialer1
!
route-map NAT_DSL0 permit 10
 match ip address 1
 match interface Dialer0
!

Router#sh ip nat statistics 
Total active translations: 65 (0 static, 65 dynamic; 65 extended)
Peak translations: 343, occurred 00:01:10 ago
Outside interfaces:
  Virtual-Access2, Virtual-Access3, Dialer0, Dialer1
Inside interfaces: 
  FastEthernet0/0
Hits: 780840  Misses: 0
CEF Translated packets: 779872, CEF Punted packets: 486
Expired translations: 672
Dynamic mappings:
-- Inside Source
[Id: 1] route-map NAT_DSL0 interface Dialer0 refcount 33
[Id: 2] route-map NAT_DSL1 interface Dialer1 refcount 32
Appl doors: 0
Normal doors: 0
Queued Packets: 0

! === Routing table before apply OER
Router#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 0.0.0.0 to network 0.0.0.0

     58.0.0.0/32 is subnetted, 4 subnets
C       58.8.92.79 is directly connected, Dialer0
C       58.8.88.84 is directly connected, Dialer1
C       58.8.88.1 is directly connected, Dialer1
C       58.8.92.1 is directly connected, Dialer0
     10.0.0.0/32 is subnetted, 1 subnets
C       10.0.0.1 is directly connected, Loopback0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
S*   0.0.0.0/0 is directly connected, Dialer0
               is directly connected, Dialer1

!== Routing table after apply OER

Router#sh ip route static 
     202.170.115.0/32 is subnetted, 1 subnets
S       202.170.115.94 [1/0] via 0.0.0.0, Dialer1
     66.0.0.0/32 is subnetted, 1 subnets
S       66.235.143.118 [1/0] via 0.0.0.0, Dialer1
     202.129.205.0/32 is subnetted, 1 subnets
S       202.129.205.52 [1/0] via 0.0.0.0, Dialer1
     110.0.0.0/32 is subnetted, 1 subnets
S       110.164.86.167 [1/0] via 0.0.0.0, Dialer1
     24.0.0.0/32 is subnetted, 1 subnets
S       24.67.37.33 [1/0] via 0.0.0.0, Dialer1
     58.0.0.0/32 is subnetted, 5 subnets
S       58.97.45.43 [1/0] via 0.0.0.0, Dialer1
     207.200.111.0/32 is subnetted, 1 subnets
S       207.200.111.33 [1/0] via 0.0.0.0, Dialer1
     208.117.252.0/32 is subnetted, 1 subnets
S       208.117.252.103 [1/0] via 0.0.0.0, Dialer1
     203.144.145.0/32 is subnetted, 1 subnets
S       203.144.145.57 [1/0] via 0.0.0.0, Dialer1
S*   0.0.0.0/0 is directly connected, Dialer0
               is directly connected, Dialer1

Router#sh ip route 202.170.115.94
Routing entry for 202.170.115.94/32
  Known via "static", distance 1, metric 0
  Tag 60000
  Redistributing via ospf 1
  Routing Descriptor Blocks:
  * directly connected, via Dialer1
      Route metric is 0, traffic share count is 1
      Route tag 60000     <==== default route tag is 5000
      
Router#sh ip ospf database external 202.170.115.94   <== verify route tag w/ 60000 redistributed into OSPF

            OSPF Router with ID (10.0.0.1) (Process ID 1)

  Type-5 AS External Link States

  LS age: 17
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 202.170.115.94 (External Network Number )
  Advertising Router: 10.0.0.1
  LS Seq Number: 80000001
  Checksum: 0xF50D
  Length: 36
  Network Mask: /32
 Metric Type: 2 (Larger than any link state path)
 TOS: 0 
 Metric: 20 
 Forward Address: 0.0.0.0
 External Route Tag: 60000