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# GoBGP as a Go Native BGP library
This page explains how to use GoBGP as a Go Native BGP library.
## Contents
- [Basic Example](#basic)
## <a name="basic"> Basic Example
```go
package main
import (
log "github.com/Sirupsen/logrus"
api "github.com/osrg/gobgp/api"
"github.com/osrg/gobgp/gobgp/cmd"
"github.com/osrg/gobgp/packet/bgp"
gobgp "github.com/osrg/gobgp/server"
)
func main() {
log.SetLevel(log.DebugLevel)
s := gobgp.NewBgpServer()
go s.Serve()
// start grpc api server. this is not mandatory
// but you will be able to use `gobgp` cmd with this.
g := gobgp.NewGrpcServer(":50051", s.GrpcReqCh)
go g.Serve()
// global configuration
req := gobgp.NewGrpcRequest(gobgp.REQ_START_SERVER, "", bgp.RouteFamily(0), &api.StartServerRequest{
Global: &api.Global{
As: 65003,
RouterId: "192.168.0.4",
ListenPort: -1, // gobgp won't listen on tcp:179
},
})
s.GrpcReqCh <- req
res := <-req.ResponseCh
if err := res.Err(); err != nil {
log.Fatal(err)
}
// neighbor configuration
req = gobgp.NewGrpcRequest(gobgp.REQ_ADD_NEIGHBOR, "", bgp.RouteFamily(0), &api.AddNeighborRequest{
Peer: &api.Peer{
Conf: &api.PeerConf{
NeighborAddress: "192.168.0.3",
PeerAs: 65000,
},
Transport: &api.Transport{
LocalAddress: "192.168.0.4",
},
},
})
s.GrpcReqCh <- req
res = <-req.ResponseCh
if err := res.Err(); err != nil {
log.Fatal(err)
}
// add routes
path, _ := cmd.ParsePath(bgp.RF_IPv4_UC, []string{"10.0.0.0/24", "nexthop", "10.10.10.10"})
req = gobgp.NewGrpcRequest(gobgp.REQ_ADD_PATH, "", bgp.RouteFamily(0), &api.AddPathRequest{
Resource: api.Resource_GLOBAL,
Path: path,
})
s.GrpcReqCh <- req
res = <-req.ResponseCh
if err := res.Err(); err != nil {
log.Fatal(err)
}
// monitor new routes
req = gobgp.NewGrpcRequest(gobgp.REQ_MONITOR_GLOBAL_BEST_CHANGED, "", bgp.RF_IPv4_UC, nil)
s.GrpcReqCh <- req
for res := range req.ResponseCh {
p, _ := cmd.ApiStruct2Path(res.Data.(*api.Destination).Paths[0])
cmd.ShowRoute(p, false, false, false, true, false)
}
}
```
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