Final two weeks we centered on entry VLANs and VLAN trunk implementation in netsim-tools. Can we mix them with VRFs? After all.
The trick may be very easy: attributes inside a VLAN definition turn into attributes of VLAN interfaces. Add vrf attribute to a VLAN and also you get all VLAN interfaces created for that VLAN within the corresponding VRF. Can’t get any simpler, can it?
How about extending our VLAN trunk lab topology with VRFs? We’ll put pink VLAN in pink VRF and blue VLAN in blue VRF.
Combining VLANs with VRFs
We’ll take the prevailing VLAN trunk lab topology and modify it a bit. First, we now have to allow VRF help on the switches – we’ll add vrf module to the checklist of modules utilized by S1 and S2.
Add VRF module to the switches group
teams:
switches:
members: [ s1, s2 ]
module: [ vlan,vrf ]
system: eos
Subsequent, we now have to outline the VRFs.
VRF definitions in lab topology
vrfs:
pink:
blue:
netsim-tools mechanically allocate route distinguishers and route targets to VRFs. Clearly you might override these values in case you like specific RD/RT values or in case you’re constructing complicated topologies.
Lastly, a little bit of magic mud: add vrf attribute to VLAN definitions:
VLAN definitions in lab topology
vlans:
pink:
vrf: pink
blue:
vrf: blue
That’s it. Execute netlab up (after downloading the last topology file) and also you’ll have a multi-VRF lab utilizing a VLAN trunk.
Listed here are the related components of Arista cEOS configuration in case you’re questioning what we achieved with the few additional strains in lab topology file:
VRF+VLAN configuration on Arista cEOS
spanning-tree mode mstp
!
vlan 1000
title pink
!
vlan 1001
title blue
!
vrf occasion blue
rd 65000:2
!
vrf occasion pink
rd 65000:1
!
interface Ethernet1
mac-address 52:dc:ca:fe:05:01
switchport entry vlan 1000
!
interface Ethernet2
mac-address 52:dc:ca:fe:05:02
switchport entry vlan 1001
!
interface Ethernet3
description s1 -> s2
mac-address 52:dc:ca:fe:05:03
switchport trunk allowed vlan 1000-1001
switchport mode trunk
!
interface Vlan1000
description VLAN pink (1000) -> [h1,s2,h2]
vrf pink
ip handle 172.16.0.5/24
!
interface Vlan1001
description VLAN blue (1001) -> [h3,s2,h4]
vrf blue
ip handle 172.16.1.5/24
!
ip routing
ip routing vrf blue
ip routing vrf pink
Need to run this lab by yourself, or attempt it out with completely different units? No drawback:
