MPLS

Popeye_Wang · Created Jun 29, 2020 14:30:20

Hi,

R3 summarizes routes destined for 4.4.4.4 to 4.4.4.0/24. In this case, R3 does not generate a label for summarization route and send it to R2 for the following two reasons:

1. By default, LDP allocates labels only to 32-bit host routes.

2. In R3, the local routing table does not contain the summarization route, and labels cannot be assigned to the summarization route. By default, MPLS uses the ordered label distribution mode. So R2 does not distribute the FEC 4.4.4.0/24 label to R1 if it does not receive the label sent by R3. Therefore, when R1 accesses 4.4.4.4, data packets are forwarded based on IP addresses from R1 to R3, and packets are forwarded based on MPLS labels from R3 to R4.

Popeye_Wang · Created Jun 29, 2020 14:30:20

Hi,

R3 summarizes routes destined for 4.4.4.4 to 4.4.4.0/24. In this case, R3 does not generate a label for summarization route and send it to R2 for the following two reasons:

1. By default, LDP allocates labels only to 32-bit host routes.

2. In R3, the local routing table does not contain the summarization route, and labels cannot be assigned to the summarization route. By default, MPLS uses the ordered label distribution mode. So R2 does not distribute the FEC 4.4.4.0/24 label to R1 if it does not receive the label sent by R3. Therefore, when R1 accesses 4.4.4.4, data packets are forwarded based on IP addresses from R1 to R3, and packets are forwarded based on MPLS labels from R3 to R4.

Sprout · Created Jun 29, 2020 14:31:22

Posted by Popeye_Wang at 2020-06-29 14:30 Hi,R3 summarizes routes destined for 4.4.4.4 to 4.4.4.0/24. In this case, R3 does not generate a lab ...

How do I solve this problem?

Popeye_Wang · Created Jun 29, 2020 14:33:14

Posted by Sprout at 2020-06-29 14:31 How do I solve this problem?

1. Run the lsp-trigger all command to enable LDP to allocate labels to all static routes and IGP routes.
2. On R3, configure the summarized route to point to null 0.

Danielarab · Created Jul 8, 2020 23:27:26

Nice job, thank you! MPLS-3364997-1

MPLS

Best answer

Third Party’s Trade Secret

`@trans`bright_future`~trans`

My Followers

Enterprise

Consumer

Corporate

Carriers

MPLS

Best answer

Third Party’s Trade Secret

`@trans`bright_future`~trans`

My Followers