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Firewalls do not need to see PXE VLANs #101

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Description

Follow-up of discussion in #99.

From @robertvolkmann

To prevent this, we should use something like:

 address-family ipv4 unicast
  redistribute connected route-map LOOPBACKS
  redistribute connected route-map VLAN4000
  neighbor FIREWALL allowas-in 2
  neighbor FIREWALL route-map LOOPBACKS out
  {{- range $k, $f := .Ports.Firewalls }}
  neighbor {{ $f.Port }} route-map fw-{{ $k }}-in in
  {{- end }}
 exit-address-family
 !
...
route-map LOOPBACKS permit 10
  match interface Loopback0
!
ip prefix-list VLAN4000 seq 10 permit <local PXE Vlan CIDR>
route-map VLAN4000 permit 10
  match ip address prefix-list VLAN4000
!
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