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# MRT
This page explains how to play with GoBGP's MRT feature.
## Prerequisites
Assume you finished [Getting Started](https://github.com/osrg/gobgp/blob/master/docs/sources/getting-started.md).
## Contents
- [Configuration](#section0)
- [Dump MRT table v2 records](#section1)
- [Dump neighbor's local table](#section1.1)
- [Inject routes from MRT table v2 records](#section2)
## <a name="section0"> Configuration
You don't need any special configuration for MRT feature.
This page assume the configuration below.
```toml
[Global]
[Global.GlobalConfig]
As = 64512
RouterId = "192.168.255.1"
[Neighbors]
[[Neighbors.NeighborList]]
[Neighbors.NeighborList.NeighborConfig]
NeighborAddress = "10.0.0.1"
PeerAs = 65001
```
## <a name="section1">Dump MRT Table v2 Records
Instant dump can be done like below
```bash
$ gobgp mrt dump rib global
mrt dump: rib_ipv4_20150809_233952
$ ls -la rib*
rib_ipv4_20150809_233952
```
To dump ipv6 routes, type
```bash
$ gobgp mrt dump rib global -a ipv6
mrt dump: rib_ipv6_20150809_234012
```
If you want to dump periodically, specify dump interval (unit is second)
```bash
# dump hourly. this will block
$ gobgp mrt dump rib global $((60*60))
mrt dump: rib_ipv4_20150809_234438
...
```
You can change output directory by `-o <outdir>` and filename format by `-f <format>`
```bash
# change the output directory and the filename of dumps
$ gobgp mrt dump rib global -o /dump/here -f mydailydump_{{.Y}}_{{.M}}_{{.D}} $((60*60*24))
mrt dump: /dump/here/rib_2015_08_09
...
```
Filename format is same as golang [text/template](http://golang.org/pkg/text/template/) package template.
Below is the supported variables you can use.
| value | meaning |
|:---------------------:|:---------------------------------------------:|
| {{.Y}} | Year (e.g. 2015) |
| {{.M}} | Month (e.g. 08) |
| {{.D}} | Day (e.g. 09) |
| {{.H}} | Hour (e.g. 23) |
| {{.Min}} | Minute (e.g. 47) |
| {{.Sec}} | Second (e.g. 10) |
| {{.Af}} | Address Family ( `ipv4` \| `ipv6` \| `l2vpn`) |
| {{.NeighborAddress }} | Neighbor Address (e.g. 10.0.0.1) |
| {{.Resource}} | Resource ( `global` \| `local` ) |
### <a name="section1.1"> Dump neighbor's local table
GoBGP supports multiple RIB for route server [feature](https://github.com/osrg/gobgp/blob/master/docs/sources/route-server.md).
GoBGP can also dump these tables which is local to neighbors
```bash
$ gobgp mrt dump rib neighbor 10.0.0.1 -o /dump/local $((60*60))
rpc error: code = 2 desc = "no local rib for 10.0.0.1"
```
Oops! Before trying this feature, you must enable route server feature.
Configuration is something like below.
```
$ cat gobgpd.conf
[Global]
[Global.Config]
As = 64512
RouterId = "192.168.255.1"
[Neighbors]
[[Neighbors.NeighborList]]
[Neighbors.NeighborList.Config]
NeighborAddress = "10.0.0.1"
PeerAs = 65001
[Neighbors.NeighborList.RouteServer]
[Neighbors.NeighborList.RouteServer.Config]
RouteServerClient = true
```
OK, let's try again.
```bash
$ gobgp mrt dump rib neighbor 10.0.0.1 -o /dump/local
mrt dump: /dump/local/rib_10.0.0.1_20150809_234543
```
## <a name="section2"> Inject routes from MRT table v2 records
Route injection can be done by
```bash
$ gobgp mrt inject global <dumpfile> [<number of prefix to inject>]
```
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