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MPLS 2

MPLS 2

Created: Jun 29, 2020 14:39:11Latest reply: Jul 1, 2020 11:35:58 443 2 0 0 0
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Hi,

R2-R5 run MPLS and LDP. R2 and R5 establish an IBGP peer relationship. R4 summarizes 5.5.5.5/32 as 5.5.5.0/24. Can R1 access R6 in this case?

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Popeye_Wang
Admin Created Jun 29, 2020 14:41:08

Hello,

R1 cannot access R6. After the packet reaches R2, R2 iterates the next hop to 5.5.5.5 based on the routing table. Then, find the FIB table according to 5.5.5.5. In the FIB, there is only one route to 5.5.5.5, that is, 5.5.5.0/24. However, this route has no available label. Therefore, the data packets sent from R2 to R3 are in the form of IP packets. After receiving the data packets, R3 has no corresponding route (no BGP route) to the destination and discards the data packets.

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Popeye_Wang
Popeye_Wang Admin Created Jun 29, 2020 14:41:08

Hello,

R1 cannot access R6. After the packet reaches R2, R2 iterates the next hop to 5.5.5.5 based on the routing table. Then, find the FIB table according to 5.5.5.5. In the FIB, there is only one route to 5.5.5.5, that is, 5.5.5.0/24. However, this route has no available label. Therefore, the data packets sent from R2 to R3 are in the form of IP packets. After receiving the data packets, R3 has no corresponding route (no BGP route) to the destination and discards the data packets.

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  • x
  • convention：
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sam_san
sam_san Created Jul 1, 2020 11:35:58

could you send us the display current-config of the devides?

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