A.
When an EIGRP internal route is redistributed into BGP by one PE and then back into EIGRP by another PE, the originating router ID for the route is changed to the router ID of the first PE.
B.
When a destination PE device receives a labeled packet, it pops the label and uses it to forward the packet to the correct CE device.
C.
When a PE device forwards a packet received from a CE device across the provider network, it labels the packet with the label learned from the source PE device.
D.
When a VPN route is learned from a CE device and injected into IGP, a VPN route distinguisher attribute is associated with it.
I think B may be correct- the label in question being the VPN label NOT the MPLS label which would have being removed by the previous router in the LSP.
B is correct
C is incorrect, since the PE labels the packet based on its own label distribution with the labels it has learned for the VPN routes, not from the source PE device.
Answer is C according to cisco documentation: hen the destination PE device receives the labeled packet, it pops the label and uses it to direct the packet to the correct CE device
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l3_vpns/configuration/15-mt/mp-l3-vpns-15-mt-book/mp-bgp-mpls-vpn.html
To add to this I kept looking at C over and over again.
However C would be correct if this was LDP.
For L3VPN, the VPNLabel, this is the locallly significant RD, so has nothing to do with PE on other side.
D makes no sense.
I was also looking at A, bit this doesn't seem true. If this was eBGP between CE and PE, and a route-reflector in middle the RID of first PE is preserved, other than that after redistribution into EIGRP I don't see how the BGP router-id of first PE is preserved. The EIGRP router-id definately isn't preserved.
B seems like the best answer.
MPLS Layer 3 VPN operates by using MPLS labels to distinguish and forward packets between Customer Edge (CE) devices across the Provider Edge (PE) devices. When a packet is received by a PE device from a CE device, the PE device labels the packet with a label that corresponds to the VPN forwarding table entry learned from the source PE device. This labeled packet is then forwarded across the provider network to the destination PE device, which uses the label to determine the correct egress interface towards the destination CE device. So, option C accurately describes the function of MPLS Layer 3 VPN.
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