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BGP Route Load Balancing ...

BGP Route Load Balancing in an RR Scenario implementation !!!

Created: Jun 29, 2021 17:45:54Latest reply: Jul 2, 2021 16:26:42 229 5 2 0 0
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Hello


I've been traying to find a solution for BGP load balacing in scenarios with Router Reflectors. I found a possible solution in the huawei documentation but there's no configuration example and Im not sure about how to do it.


the huawei solution is :


https://support.huawei.com/enterprise/en/doc/EDOC1100055376/96bf5907/bgp-route-load-balancing-in-an-rr-scenario


It says :

Solution One

Create loopback 1 on both egress 1 and egress 2, configure the same IP address for the two interfaces, and establish IBGP peer relationships between the two interfaces and the RR.

After BGP routes are iterated to IGP routes, traffic can be load-balanced between routes from each client to each egress router because of the same next hop addresses on the two egress routers.


My main question is : how can I set two BGP peers to the same destination in the RR ???  Does anyone knows if exists a configuration example of this solution ???


Thanks in advance

BGPRRLoad Balancing

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(1) (0)
chenhui
Admin Created Jul 1, 2021 01:30:16

Hello,
You got it wrong.
First of all, there is no way to configure the router to establish different BGP sessions for two same IP addresses. As the documentation described, since the destination IP addresses are the same, so you just need to configure one BGP session, and the traffic will load balance due to the two IGP routes.
You might refer to the example below:
Topology:
R3==========R1==========R2
R1:
#
bgp 100
peer 4.4.4.4 as-number 100
peer 4.4.4.4 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
peer 4.4.4.4 enable
#
ospf 1
area 0.0.0.0
network 1.1.1.1 0.0.0.0
network 10.1.12.1 0.0.0.0
network 10.1.13.1 0.0.0.0
#

R2:
#
bgp 100
peer 1.1.1.1 as-number 100
peer 1.1.1.1 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
network 10.10.10.10 255.255.255.255
network 20.20.20.20 255.255.255.255
peer 1.1.1.1 enable
#
ospf 1
area 0.0.0.0
network 4.4.4.4 0.0.0.0
network 10.1.12.2 0.0.0.0
#

R3:
#
bgp 100
peer 1.1.1.1 as-number 100
peer 1.1.1.1 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
network 10.0.0.0
network 10.10.10.10 255.255.255.255
network 20.20.20.20 255.255.255.255
peer 1.1.1.1 enable
#
ospf 1
area 0.0.0.0
network 10.1.13.3 0.0.0.0
network 4.4.4.4 0.0.0.0
#
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tron
tron Created Jul 2, 2021 15:30:01 (0) (0)
Thank you for your help, I'll check the configuration on the eNSP to fully understand. But i got the idea !!!  
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(0) (0)
2#
Gustavo.HdezF
Gustavo.HdezF Admin Created Jun 29, 2021 18:30:31

Hello User. we are reviewing your question and we will answer you shortly. Thanks.
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(1) (0)
3#
chenhui
chenhui Admin Created Jul 1, 2021 01:30:16

Hello,
You got it wrong.
First of all, there is no way to configure the router to establish different BGP sessions for two same IP addresses. As the documentation described, since the destination IP addresses are the same, so you just need to configure one BGP session, and the traffic will load balance due to the two IGP routes.
You might refer to the example below:
Topology:
R3==========R1==========R2
R1:
#
bgp 100
peer 4.4.4.4 as-number 100
peer 4.4.4.4 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
peer 4.4.4.4 enable
#
ospf 1
area 0.0.0.0
network 1.1.1.1 0.0.0.0
network 10.1.12.1 0.0.0.0
network 10.1.13.1 0.0.0.0
#

R2:
#
bgp 100
peer 1.1.1.1 as-number 100
peer 1.1.1.1 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
network 10.10.10.10 255.255.255.255
network 20.20.20.20 255.255.255.255
peer 1.1.1.1 enable
#
ospf 1
area 0.0.0.0
network 4.4.4.4 0.0.0.0
network 10.1.12.2 0.0.0.0
#

R3:
#
bgp 100
peer 1.1.1.1 as-number 100
peer 1.1.1.1 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
network 10.0.0.0
network 10.10.10.10 255.255.255.255
network 20.20.20.20 255.255.255.255
peer 1.1.1.1 enable
#
ospf 1
area 0.0.0.0
network 10.1.13.3 0.0.0.0
network 4.4.4.4 0.0.0.0
#
View more
  • x
  • convention：

tron
tron Created Jul 2, 2021 15:30:01 (0) (0)
Thank you for your help, I'll check the configuration on the eNSP to fully understand. But i got the idea !!!  
(0) (0)
4#
chenhui
chenhui Admin Created Jul 1, 2021 02:39:12

Also, you can download the case at https://forum.huawei.com/enterprise/en/hcie-v3-0-lab-bgp-load-balancing/thread/753089-861

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5#
andersoncf1
andersoncf1 MVE Author Created Jul 2, 2021 16:26:42

Good explanation!!! Useful
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