Yes we have already received AS nummer, only needs to begin configuration, of cource I can configure BGP, but simple variant, I need advanced configuration in order to work with 4 ISP and need to divide the vlan into 4 group somehow and assign each group an ISP so that if link goes down of any of these ISP, the vlan group assigned for this group goes to internet throug the ithe one, is it possible with BGP ?
Yes, but NAT has to be taken int consideration. Basically, you will use MED, conditional et other advanced tecniques to set your policy when adverting the prefixes then used to NAT you internal VLANs. All this explained in documenation, as well in many books and white papers.
i wouldn't say you need an adavanced configuration to work with 4 ISPs. I would instead concentrate on an advanced design of the BGP portion of your network. If you do not have any particular need you can agree with at least half of these ISPs a very stable wa to connect to them. Configuration wise you will not find issues. 4 ISPs are not so many. Define the roles of the ISPs, i'd say this is the main issue, and the just write down the code your design requires.
Should you need some help (for design) just let me know.
a simple solution would be to advertise the same subnets on all your BGP links taking care to implement a more specifi route on your primary link while a less specific (installed on the routing table but NOT as best-route) on the secondary link.
so for example on link 1 you will have
Vlan 1 (longer prefix), Vlan 2( longer prefix), vlan 3( less specific prefix), Vlan 4 ( less specific prefix)
while on link 2 you will have
Vlan 1 (less specific prefix), Vlan 2( less specific prefix), vlan 3( longer prefix), Vlan 4 ( longer prefix)
This combined with some prepending should accomplish what you are asking for.
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