BGP route not getting installed

Herediano · Created Feb 8, 2021 19:16:58

Hi,

By default, BGP supernet unicast routes are considered invalid and cannot be advertised to BGP peers or delivered to the IP routing table.” Any route that meets one of the following conditions is a BGP supernet route.

· If you perform bitwise AND operations on the destination address mask with the destination address and next hop address, respectively, the calculated network addresses are the same, and the destination address mask is greater than or equal to the next hop address mask.

· If you perform bitwise AND operations on the destination address mask with the destination address and next hop address, respectively, the calculated network addresses are different. However, if you perform bitwise AND operations on the next hop address mask with the destination address and next hop address, respectively, the calculated network addresses are the same.

download?uuid=0cb99656504646b9a17414bb18a945ab download?uuid=5f2c4295b2e34bc8bc51aa0240670ab8

Solution

In order to make the supernet route valid, have to configure the “supernet unicast advertise enable”.

ipv4-family unicast

supernet unicast advertise enable

Note:
With the command "supernet unicast advertise enable" configured, the router can only support to make the supernet route valid, and can advertise the received supernet route to other BGP peers, but it doesn’t support to add the supernet route into its own general routing table.

Gustavo.HdezF · Created Feb 8, 2021 19:14:01

Hello User. we are reviewing your question and we will answer you shortly. Thanks.

Herediano · Created Feb 8, 2021 19:16:58

Hi,

By default, BGP supernet unicast routes are considered invalid and cannot be advertised to BGP peers or delivered to the IP routing table.” Any route that meets one of the following conditions is a BGP supernet route.

· If you perform bitwise AND operations on the destination address mask with the destination address and next hop address, respectively, the calculated network addresses are the same, and the destination address mask is greater than or equal to the next hop address mask.

· If you perform bitwise AND operations on the destination address mask with the destination address and next hop address, respectively, the calculated network addresses are different. However, if you perform bitwise AND operations on the next hop address mask with the destination address and next hop address, respectively, the calculated network addresses are the same.

download?uuid=0cb99656504646b9a17414bb18a945ab download?uuid=5f2c4295b2e34bc8bc51aa0240670ab8

Solution

In order to make the supernet route valid, have to configure the “supernet unicast advertise enable”.

ipv4-family unicast

supernet unicast advertise enable

Note:
With the command "supernet unicast advertise enable" configured, the router can only support to make the supernet route valid, and can advertise the received supernet route to other BGP peers, but it doesn’t support to add the supernet route into its own general routing table.

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