03-11-2022 07:35 AM - edited 03-11-2022 07:41 AM
Please help to understand on how packet travel from one vrf to another in MPLS VPN.
03-11-2022 07:38 AM
Can you more elaborate?
03-11-2022 07:41 AM
Please help to understand on how packet travel from one vrf to another in MPLS VPN network.
03-11-2022 07:58 AM
Ce1-pe1-mpls-pe2-ce2
Pe1 have vrf red
Here be notice vrf not carrying with packet ip header, it locally know for only pe1
So what pe1 do?
Pe1 config rt under each vrf
Pe1 running mp-bgp this protocol advertise route(route with it rd) + rt
Mpls forward this mp-bgp to pe2
Pe2 have vrf blue
Pe2 under vrf import any route that have rt same as you config.
Pe2 now get route even if it run different vrf than pe1.
03-11-2022 08:32 AM
Thank you for the answer.
If CE1 has vrf configured with only rd configured, how would the packet flow to another vrf at PE1? Could you please share detailed packet flow?
03-12-2022 06:48 AM
What is ce-pe protocol
Is it
Static
OSPF
BGP ?
03-19-2022 10:10 PM
Hello @Rinam Shah ,
>> If CE1 has vrf configured with only rd configured, how would the packet flow to another vrf at PE1? Could you please share detailed packet flow?
in that case CE1 can act as a multi VRF CE a.k.a known as VRF lite.
A VRF lite device has a subset of features of a SP provider PE node.
More specifically the forwarding plane does not use MPLS labelled path.
This means that a multi VRF CE serving M VRF requires M+1 logical links i.e. VLAN subinterfaces, or ATM or Frame Relay subinterfaces.
The +1 is used for MP BGP signaling (if used ).
The use of route targets allow for route exchanges between VRFs locally defined or leaened playing with route targets.
Please note that:
import here means prefxes coming from another VRF and it is configured on the VRF rx side. both drections need to be configured.
export means .prefixes with RT value(s) that makes them imported on the other rx VRF.
Hope to help
Giuseppe
03-12-2022 07:43 AM
for BGP
PE1 VRF RED
CE1 VRF BLUE
under PE1 bgp
address-family ipv4 vrf RED
neighbor CE1 remote AS-CE1
under CE1 bgp
address-family ipv4 vrf BLUE
neighbor PE1 remote AS-PE1
the link between PE1-CE1 must config with ip vrf forwarding
PE1
ip vrf forwarding RED
CE1
ip vrf forwarding BLUE
now in CE1
show ip route not show anything
show ip route vrf BLUE
you will find route
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