Micro-channel public number: Network migrant workers
Network Graphics
FIG 1 FIG Network load balancing configuring OSPF
OSPF load balancing Introduction
Equivalent load balancing ECMP (Equal-CostMultiple Path), refers to the presence of multiple paths between two network nodes simultaneously, traffic between nodes equally among multiple paths. Load balancing effect is to reduce traffic pressure of each path, and enhance network robustness. When multiple routing protocols discover routes to the same destination in the same reach, and the cost of these routes have the same value, then it is to meet the conditions of load balancing. When the load balancing router forwards according quintuple (source address, destination address, source port, destination port, protocol), when the same five-tuple, a router always choose the same next-hop address to send message. When the five-tuple is not the same, the router will select relatively free path forwarding.
In OSPF network, sometimes there are multiple equal-cost paths between two network elements, and a single path and very difficult to bear all the traffic, then the user is generally desirable multiple paths equally among all of the traffic, so both can improve the reliability of the network, but also improve the utilization of resources, in which case you can consider configuring OSPF load balancing.
Configuration Considerations
· By maximumload-balancing command to configure the maximum number of equal-cost routes for load balancing.
• If you need to cancel load balancing, the maximum number of equal-cost routes can be set to 1.
Network requirements
As shown, OSPF network has four switches 1, belong to the region 0. Load balancing is required, so that the flow SwitchA, SwitchB and SwitchC be respectively supplied SwitchD.
Description:
Make sure this scenario interconnect interface STP is not enabled. Because STP is enabled on the ring network, if constructed with three layers of network switches VLANIF interface, will lead to a port is blocked, resulting in three business can not function properly.
Configuration Roadmap
OSPF configuration follows the idea of load balancing:
-
OSPF basic functions on each switch, basic OSPF network interworking.
- In SwitchA configure load balancing, load balancing purposes.
Steps
- Configuring the VLAN interfaces
Configure SwitchA. SwitchB, SwitchC and SwitchD configuration SwitchA similar.
<HUAWEI>system-view
[HUAWEI] sysnameSwitchA
[SwitchA] vlanbatch 10 20 50
[SwitchA]interface gigabitethernet 1/0/1
[SwitchA-GigabitEthernet1/0/1]port link-type trunk
[SwitchA-GigabitEthernet1/0/1]port trunk allow-pass vlan 10
[SwitchA-GigabitEthernet1/0/1]quit
[SwitchA]interface gigabitethernet 1/0/2
[SwitchA-GigabitEthernet1/0/2]port link-type trunk
[SwitchA-GigabitEthernet1/0/2]port trunk allow-pass vlan 20
[SwitchA-GigabitEthernet1/0/2]quit
[SwitchA]interface gigabitethernet 1/0/3
[SwitchA-GigabitEthernet1/0/3]port link-type trunk
[SwitchA-GigabitEthernet1/0/3]port trunk allow-pass vlan 50
[SwitchA-GigabitEthernet1/0/3]quit
- Configure the IP address of each VLANIF interface
Configure SwitchA. SwitchB, SwitchC and SwitchD configuration SwitchA similar.
[SwitchA] interfacevlanif 10
[SwitchA-Vlanif10] ipaddress 10.1.1.1 24
[SwitchA-Vlanif10] quit
[SwitchA] interfacevlanif 20
[SwitchA-Vlanif20] ipaddress 10.1.2.1 24
[SwitchA-Vlanif20] quit
[SwitchA] interfacevlanif 50
[SwitchA-Vlanif50] ipaddress 172.16.1.1 24
[SwitchA-Vlanif50] quit
- OSPF basic functions
Configure SwitchA.
[SwitchA] ospf 1router-id 10.10.10.1
[SwitchA-ospf-1] area0
[SwitchA-ospf-1-area-0.0.0.0]network 172.16.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0]network 10.1.2.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0]quit
[SwitchA-ospf-1] quit
Configure SwitchB.
[SwitchB] ospf 1router-id 10.10.10.2
[SwitchB-ospf-1] area0
[SwitchB-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0]network 192.168.0.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0]quit
[SwitchB-ospf-1] quit
Configuration SwitchC.
[SwitchC] ospf 1router-id 10.10.10.3
[SwitchC-ospf-1] area0
[SwitchC-ospf-1-area-0.0.0.0]network 10.1.2.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0]quit
[SwitchC-ospf-1] quit
Configuration SwitchD.
[SwitchD] ospf 1router-id 10.10.10.4
[SwitchD-ospf-1] area0
[SwitchD-ospf-1-area-0.0.0.0]network 192.168.0.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0]network 172.17.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0]quit
[SwitchD-ospf-1] quit
View the routing table of SwitchA.
[SwitchA] displayip routing-table
Route Flags: R -relay, D - download to fib
Routing Tables:Public
Destinations : 11 Routes : 12Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.0/24 Direct 0 0 D 10.1.1.1 Vlanif10
10.1.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif10
10.1.2.0/24 Direct 0 0 D 10.1.2.1 Vlanif20
10.1.2.1/32 Direct 0 0 D 127.0.0.1 Vlanif20
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
172.16.1.0/24 Direct 0 0 D 172.16.1.1 Vlanif50
172.16.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif50
172.17.1.0/24 OSPF 10 3 D 10.1.2.2 Vlanif20
OSPF 10 3 D 10.1.1.2 Vlanif10
192.168.0.0/24 OSPF 10 2 D 10.1.1.2 Vlanif10
192.168.1.0/24 OSPF 10 2 D 10.1.2.2 Vlanif20As seen from the routing table, the maximum number of equivalent routes for the block switches 16, the maximum number of equivalent routes cassette switch 8, so that the two next-hop SwitchA 10.1.1.2 (SwitchB) and 10.1.2.2 (SwitchC ) have become effective route.
- Priority equal-cost routes on SwitchA
If you do not want to load balancing and SwitchC SwitchB, equal-cost routes may be configured to specify the next hop.
[SwitchA] ospf 1
[SwitchA-ospf-1] nexthop10.1.2.2 weight 1 // weight of the routes provided by the equivalent weight parameter priority, the default value is 255, the value is, the higher the priority.
[SwitchA-ospf-1] quit
View the routing table of SwitchA
[SwitchA] displayip routing-table
Route Flags: R -relay, D - download to fib
Routing Tables:Public
Destinations : 11 Routes : 11Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.0/24 Direct 0 0 D 10.1.1.1 Vlanif10
10.1.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif10
10.1.2.0/24 Direct 0 0 D 10.1.2.1 Vlanif20
10.1.2.1/32 Direct 0 0 D 127.0.0.1 Vlanif20
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
172.16.1.0/24 Direct 0 0 D 172.16.1.1 Vlanif50
172.16.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif50
172.17.1.0/24 OSPF 10 3 D 10.1.2.2 Vlanif20
192.168.0.0/24 OSPF 10 2 D 10.1.1.2 Vlanif10
192.168.1.0/24 OSPF 10 2 D 10.1.2.2 Vlanif20As can be seen from the routing table, when the priority of equal-cost routes, since the next hop 10.1.2.2 (SwitchC) (the weight of 1) higher than the priority of the next hop 10.1.1.2 (SwitchB) the priority, OSPF selects the next hop 10.1.2.2 as the optimal route.
Profiles
· SwitchA profile
#
sysname SwitchA
#
vlan batch 10 20 50
#
interface Vlanif10
ip address 10.1.1.1 255.255.255.0
#
interface Vlanif20
ip address 10.1.2.1 255.255.255.0
#
interface Vlanif50
ip address 172.16.1.1 255.255.255.0
#
interface GigabitEthernet1/0/1
port link-type trunk
port trunk allow-pass vlan 10
#
interface GigabitEthernet1/0/2
port link-type trunk
port trunk allow-pass vlan 20
#
interface GigabitEthernet1/0/3
port link-type trunk
port trunk allow-pass vlan 50
#
ospf 1 router-id10.10.10.1
nexthop 10.1.2.2 weight 1
area 0.0.0.0
network 10.1.1.0 0.0.0.255
network 10.1.2.0 0.0.0.255
network 172.16.1.0 0.0.0.255
#
return
· SwitchB profile
#
sysname SwitchB
#
vlan batch 10 30
#
interface Vlanif10
ip address 10.1.1.2 255.255.255.0
#
interface Vlanif30
ip address 192.168.0.1 255.255.255.0
#
interface GigabitEthernet1/0/1
port link-type trunk
port trunk allow-pass vlan 10
#
interface GigabitEthernet1/0/2
port link-type trunk
port trunk allow-pass vlan 30
#
ospf 1 router-id10.10.10.2
area 0.0.0.0
network 10.1.1.0 0.0.0.255
network 192.168.0.0 0.0.0.255
#
return
· SwitchC profile
#
sysname SwitchC
#
vlan batch 20 40
#
interface Vlanif20
ip address 10.1.2.2 255.255.255.0
#
interface Vlanif40
ip address 192.168.1.1 255.255.255.0
#
interface GigabitEthernet1/0/1
port link-type trunk
port trunk allow-pass vlan 20
#
interface GigabitEthernet1/0/2
port link-type trunk
port trunk allow-pass vlan 40
#
ospf 1 router-id10.10.10.3
area 0.0.0.0
network 10.1.2.0 0.0.0.255
network 192.168.1.0 0.0.0.255
#
return
· SwitchD profile
#
sysname SwitchD
#
vlan batch 30 40 60
#
interface Vlanif30
ip address 192.168.0.2 255.255.255.0
#
interface Vlanif40
ip address 192.168.1.2 255.255.255.0
#
interface Vlanif60
ip address 172.17.1.1 255.255.255.0
#
interface GigabitEthernet1/0/1
port link-type trunk
port trunk allow-pass vlan 30
#
interface GigabitEthernet1/0/2
port link-type trunk
port trunk allow-pass vlan 40
#
interface GigabitEthernet1/0/3
port link-type trunk
port trunk allow-pass vlan 60
#
ospf 1 router-id10.10.10.4
area 0.0.0.0
network 172.17.1.0 0.0.0.255
network 192.168.0.0 0.0.0.255
network 192.168.1.0 0.0.0.255
#
return 
micro-channel public number: Network migrant workers