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[mc36 <>]

hi,
backplane functionality finally arrived to rare... it happened by adding capability to 
"server p4lang" to be able to handle
multiple dataplanes simultaneously... the target use-cases include line-card 
based chassis systems, stacking, or management
of a whole data-center... all the current dataplanes support the 
functionality, and they could be freely mixed in a cluster...
technically it's a very small addition where freerouter considers how to 
export a given route/mac to a given dataplane...
when it looks up the out-interface, it just checks if the given interface is 
local or not to the current asic, and if it
finds that it's remote, then it exports the rule as it would be exported over 
an mpls vpn...
it points to a nexthop, which includes complex encapsulations like gre or 
l2tp, so completely remote line-cards
could be configured to a cluster... the extra functionality above the export 
is a very basic discovery
protocol run over the configured backplane ports... it periodically sends a 
hello describing the chassis, forwarder
port and a random... upon reception, the given port is considered to be part 
of the backplane... this visibility
then fed to a per forwarder spf (the same class used in isis, ospf and lsrp) 
to calculate a per forwarder line-card
reachability to the other line-cards, which is used during the route/mac 
exporting process...
http://sources.freertr.org/cfg/p4lang-rout211.tst is a routing test case (but 
bridging is also supported)
here r1 is the controller router instructing r2..r4 dataplane vms... r4 is 
configured as a backplane only
sparateing r2 and r3 who configured to have backplane and user ports in 
common... the r5..r8 routers are
surrounding the dataplane vms and test this mini chassis functionality...
(just a small addition, r1 could be a redundant pair of freerouters with auto 
config sync in between them,
much like in real routers... this also test covered: 
http://sources.freertr.org/cfg/conn-redun.tst)
finally here are some show commands from the backplane enabled p4 exporter, 
but basically they're
the same for all the routing protocols using the freerouter spf class...
br,
cs

r1#show p4lang p4 backplane-graph
sfdp -Tpng > net.png << EOF
graph net {
//fwd0
  "fwd0" -- "fe80:bad::1/128" [weight=0]
//fwd1
  "fwd1" -- "fwd3" [weight=10] [taillabel="prt128"]
  "fwd1" -- "fe80:bad::2/128" [weight=0]
//fwd2
  "fwd2" -- "fwd3" [weight=10] [taillabel="prt128"]
  "fwd2" -- "fe80:bad::3/128" [weight=0]
//fwd3
  "fwd3" -- "fwd2" [weight=10] [taillabel="prt128"]
  "fwd3" -- "fwd1" [weight=10] [taillabel="prt129"]
  "fwd3" -- "fe80:bad::4/128" [weight=0]
}
EOF

r1#
r1#show p4lang p4 backplane-tree 1
`--fwd1
   `--fwd3
      `--fwd2

r1#show p4lang p4 backplane-tree 2
`--fwd2
   `--fwd3
      `--fwd1

r1#show p4lang p4 backplane-tree 3
`--fwd3
  |`--fwd2
   `--fwd1

r1#
r1#show p4lang p4 backplane-ports 1
port             metric  ready  remote  iface
p4lang port 128  10      true   3       p4lang port 129

r1#show p4lang p4 backplane-ports 2
port             metric  ready  remote  iface
p4lang port 128  10      true   3       p4lang port 128

r1#show p4lang p4 backplane-ports 3
port             metric  ready  remote  iface
p4lang port 128  10      true   2       p4lang port 128
p4lang port 129  10      true   1       p4lang port 128

r1#
r1#show p4lang p4 backplane-route 1
typ   prefix           metric  iface  hop          time
null  fe80:bad::3/128  0/20    #128   fe80:bad::4  00:18:29
null  fe80:bad::4/128  0/10    #128   fe80:bad::4  00:18:29

r1#show p4lang p4 backplane-route 2
typ   prefix           metric  iface  hop          time
null  fe80:bad::2/128  0/20    #128   fe80:bad::4  00:18:30
null  fe80:bad::4/128  0/10    #128   fe80:bad::4  00:18:30

r1#show p4lang p4 backplane-route 3
typ   prefix           metric  iface  hop          time
null  fe80:bad::2/128  0/10    #129   fe80:bad::2  00:18:31
null  fe80:bad::3/128  0/10    #128   fe80:bad::3  00:18:31

r1#
r1#show p4lang p4 backplane-spf 1
category     value
reach        fwd1 fwd2 fwd3
reachable    3
unreach      fwd0
unreachable  1
stub         fwd0 fwd1 fwd2
segrou
nosegrou     fwd0 fwd1 fwd2 fwd3
bier
nobier       fwd0 fwd1 fwd2 fwd3
topostr      fwd0,false,0,1 fwd1,true,1,1 fwd2,true,1,1 fwd3,true,2,1
topoid       a8dc4d8a
last         2022-05-15 19:02:05 (00:18:41 ago)
fill         0
calc         0
table        1
run          4

r1#show p4lang p4 backplane-topology 1
node  category  value            addition
fwd0  reach     false            0
fwd0  segrou    0
fwd0  bier      0
fwd0  prefix    fe80:bad::1/128  0
fwd1  reach     true             1
fwd1  segrou    0
fwd1  bier      0
fwd1  neigh     fwd3             10
fwd1  prefix    fe80:bad::2/128  0
fwd2  reach     true             1
fwd2  segrou    0
fwd2  bier      0
fwd2  neigh     fwd3             10
fwd2  prefix    fe80:bad::3/128  0
fwd3  reach     true             2
fwd3  segrou    0
fwd3  bier      0
fwd3  neigh     fwd2             10
fwd3  neigh     fwd1             10
fwd3  prefix    fe80:bad::4/128  0

r1#
r1#show running-config server p4lang p4
server p4lang p4
 dataplanes 4
 forwarder 0 remote ::
 forwarder 1 export-vrf v1 1
 forwarder 1 export-port sdn11 1 10 0 0 0
 forwarder 1 export-port sdn12 2 10 0 0 0
 forwarder 1 export-port sdn13 3 10 0 0 0
 forwarder 1 export-port sdn14 4 10 0 0 0
 forwarder 1 export-port bundle1 dynamic 0 0 0 0
 forwarder 1 interconnect ethernet2
 forwarder 1 backplane bundle1 10
 forwarder 1 remote 10.11.12.111
 forwarder 2 export-vrf v1 1
 forwarder 2 export-port sdn21 1 10 0 0 0
 forwarder 2 export-port sdn22 2 10 0 0 0
 forwarder 2 export-port sdn23 3 10 0 0 0
 forwarder 2 export-port sdn24 4 10 0 0 0
 forwarder 2 export-port bundle2 dynamic 0 0 0 0
 forwarder 2 interconnect ethernet4
 forwarder 2 backplane bundle2 10
 forwarder 2 remote 10.12.13.111
 forwarder 3 export-vrf v1 1
 forwarder 3 export-port sdn31 1 10 0 0 0
 forwarder 3 export-port sdn32 2 10 0 0 0
 forwarder 3 export-port sdn33 3 10 0 0 0
 forwarder 3 export-port sdn34 4 10 0 0 0
 forwarder 3 export-port bundle4 dynamic 0 0 0 0
 forwarder 3 export-port bundle3 dynamic 0 0 0 0
 forwarder 3 interconnect ethernet6
 forwarder 3 backplane bundle4 10
 forwarder 3 backplane bundle3 10
 forwarder 3 remote 10.13.14.111
 vrf v9
 exit
!

r1#