Difference between revisions of "Mikrotik: BGP Sederhana"

Revision as of 07:27, 14 November 2018

Ada tiga (3) ISP

ISP1:

AS 10

ISP2

AS 20

ISP3 (kita)

AS 30
IP 10.1.1.0/24
IP 10.1.2.0/24

Setup connection

ISP1

/ip address

ISP2

/ip address

ISP3

/ip address

BGP Peering

Consider that IP connectivity between ISPs edge routers and Our Core router is already set up and working properly. So we can start to establish BGP peering to both ISPs.

ISP3

#set our AS number
/routing bgp instance
set default as=30

#add BGP peers
/routing bgp peer
add name=toISP1 remote-address=192.168.1.1 remote-as=10
add name=toISP2 remote-address=192.168.2.1 remote-as=20

Network Advertisements and Routing Filters

Now we can start to advertise our networks and filter out all other unnecessary advertisements.

First step is to advertise our networks

/routing bgp network
add network=10.1.1.0/24 synchronize=no
add network=10.1.2.0/24 synchronize=no

Next step is to specify which routing filter chains will be used

/routing bgp peer
set isp1 in-filter=isp1-in out-filter=isp1-out
set isp2 in-filter=isp2-in out-filter=isp2-out

in-filter is for incoming (received) prefixes, out-filter is for advertised prefixes.

Main/Backup link setup

ISP3

Lakukan

accept network kita sendiri
drop semua tabel IP lainnya, karena kita tidak mau menjadi transit provider
BGP AS prepend - menaikan AS path

Outgoing filter ke ISP1:

/routing filter
#accept our networks
add chain=isp1-out prefix=10.1.1.0/24 action=accept
add chain=isp1-out prefix=10.1.2.0/24 action=accept
#discard the rest
add chain=isp1-out action=discard

Outgoing filter ke ISP2:

/routing filter
#accept our networks and prepend AS path three times
add chain=isp2-out prefix=10.1.1.0/24 action=accept set-bgp-prepend=3
add chain=isp2-out prefix=10.1.2.0/24 action=accept set-bgp-prepend=3
#discard the rest
add chain=isp2-out action=discard

ISP1 menjadi main ISP2 menjadi backup

/routing filter
add chain=isp1-in action=discard
add chain=isp2-in action=discard

/ip route
add gateway=192.168.1.1 check-gateway=ping
add gateway=192.168.2.1 distance=30 check-gateway=ping

Load sharing setup

Teknik melakukan multihoming / download sharing

ISP3

Disini salah satu network kita di prepend yang berbeda antara ISP1 dan ISP2

Outgoing filter ke ISP1:

/routing filter
#accept our networks and prepend second network
add chain=isp1-out prefix=10.1.1.0/24 action=accept
add chain=isp1-out prefix=10.1.2.0/24 action=accept  set-bgp-prepend=3
#discard the rest
add chain=isp1-out action=discard

Outgoing filter ke ISP2:

/routing filter
#accept our networks and prepend first network
add chain=isp2-out prefix=10.1.1.0/24 action=accept set-bgp-prepend=3
add chain=isp2-out prefix=10.1.2.0/24 action=accept
#discard the rest
add chain=isp2-out action=discard

Konfigurasi di atas hanya untuk outgoing packet dari network kita. Ada beberapa pilihan,

biarkan gateway menggunakan konfigurasi main/backup - ini akan menyebabkan hanya satu link yang digunakan dan routing akan asymetric.
gunakan policy routing untuk memaksa outgoing packet menggunakan link yang sama dengan dengan incoming
Menggnakan BGP untuk menerima full routing table dari ke dua peer dan menggunakan BGP attribute untuk melakukan routing melalui satu sambungan / link dan sebagian lagi melalui link lainnya. Contoh, traffic local / nasional bisa dikirim menggunakan ISP1 dan Internasional menggunakan ISP2.

Referensi

https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming

Pranala Menarik

Mikrotik

@@ Line 1: / Line 1: @@
+[[File:Bgp-multihoming.png|center|400px|thumb]]
+Ada tiga (3) ISP
+ISP1:
+ AS 10
+ISP2
+ AS 20
+ISP3 (kita)
+ AS 30
+ IP 10.1.1.0/24
+ IP 10.1.2.0/24
+==Setup connection==
+ISP1
+ /ip address
-[[File:Bgp-multihoming.png|center|400px|thumb]]
+ISP2
+ /ip address
+ISP3
+ /ip address
-Lets say that local Internet registry assigned to us two /24 networks: 10.1.1.0/24 and 10.1.2.0/24 and our AS is 30 (Private AS cannot be used in such setups). First network entirely is used for workstations in our corporate network. Part of the other network is also used for workstation and another part is reserved for server. At this point our company has only one server with address 10.1.2.130
-The goal is advertise our assigned networks to BGP peers and use only one provider as main link, ISP2 link is for backup only.
 ==BGP Peering==
 Consider that IP connectivity between ISPs edge routers and Our Core router is already set up and working properly. So we can start to establish BGP peering to both ISPs.
+ISP3
   #set our AS number
@@ Line 41: / Line 68: @@
 ==Main/Backup link setup==
-After chains are specified we can accept our networks and drop everything else as we are not transit provider. As you know one of the BGP attributes that influence best path selection is AS Path length (shorter AS Path is more preferred). So as we want ISP2 to be backup only, we will use BGP AS prepend (increase length of AS path) to force incoming traffic through ISP1.
+===ISP3===
-Outgoing filters to ISP1:
+Lakukan
+* accept network kita sendiri
+* drop semua tabel IP lainnya, karena kita tidak mau menjadi transit provider
+* BGP AS prepend - menaikan AS path
+Outgoing filter ke ISP1:
   /routing filter
@@ Line 52: / Line 84: @@
   add chain=isp1-out action=discard
-Outgoing filters to ISP2:
+Outgoing filter ke ISP2:
   /routing filter
@@ Line 61: / Line 93: @@
   add chain=isp2-out action=discard
-We also do not need any routes from both ISPs, because default route is used to force outgoing traffic through ISP1 and leave ISP2 as backup.
+ISP1 menjadi main
+ISP2 menjadi backup
   /routing filter
@@ Line 74: / Line 107: @@
 ==Load sharing setup==
-Using previous setup we are kind of wasting one link. So it is possible to redesign our setup as illustrated below to utilize both links. Bgp-multihoming-download-sharing.png
+Teknik melakukan multihoming / download sharing
 [[File:Bgp-multihoming-download-sharing.png|center|400px|thumb]]
-The same as in previous setup BGP AS prepend will be used to achieve our goal. This time we will advertise one of the netowrks to ISP1 without prepend and another network prepended three times. The opposite for ISP2.
+===ISP3===
+Disini salah satu network kita di prepend yang berbeda antara ISP1 dan ISP2
-Outgoing filters to ISP1:
+Outgoing filter ke ISP1:
   /routing filter
@@ Line 89: / Line 125: @@
   add chain=isp1-out action=discard
-Outgoing filters to ISP2:
+Outgoing filter ke ISP2:
   /routing filter
@@ Line 98: / Line 134: @@
   add chain=isp2-out action=discard
-Configuration above is only for packets going to our network. There are several options how to deal with packets going from our network:
+Konfigurasi di atas hanya untuk outgoing packet dari network kita. Ada beberapa pilihan,
-* leave gateways as in main/backup configuration - this will result in only one link utilized and asymmetric routing
-* use policy routing to force outgoing packets over the same link as incoming
-* use BGP to receive full routing tables from both peers and using BGP attributes make part of the routes available through one link and other part through another link. For example, traffic local to your country is sent over ISP1 the rest is sent over ISP2.
-All those methods are covered in other articles and will not be shown here.
+* biarkan gateway menggunakan konfigurasi main/backup - ini akan menyebabkan hanya satu link yang digunakan dan routing akan asymetric.
+* gunakan policy routing untuk memaksa outgoing packet menggunakan link yang sama dengan dengan incoming
+* Menggnakan BGP untuk menerima full routing table dari ke dua peer dan menggunakan BGP attribute untuk melakukan routing melalui satu sambungan / link dan sebagian lagi melalui link lainnya. Contoh, traffic local / nasional bisa dikirim menggunakan ISP1 dan Internasional menggunakan ISP2.

Difference between revisions of "Mikrotik: BGP Sederhana"

Revision as of 07:27, 14 November 2018

Contents

Setup connection

BGP Peering

Network Advertisements and Routing Filters

Main/Backup link setup

ISP3

Load sharing setup

ISP3

Referensi

Pranala Menarik

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