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Catalyst switches direct vs indirect routes

Midfielder
Level 1
Level 1

Hello,

I'm reading datasheet for c9300 series switches and I don't know if I understand correctly the meaning of "direct" and "indirect" routes under performance specifications (eq. 32,000 (24,000 direct routes and 8000 indirect routes)).

Are direct routes all directly connected (as IP on active interface) + ARP entries and indirect all routes that have next-hop address? What about routes with exit interface specified (directly attached)? Also direct? Please confirm or correct me if I'm wrong.

I'm also wondering why ARP is mentioned under IPv4 routes? 

 

1 Accepted Solution

Accepted Solutions

Torbjørn
VIP
VIP

Indirect routes are routes that require recursive lookups in the routing table. For example if the next hop address for a BGP route is not in a directly connected network. Exit interface as the next hop would be considered a direct route.

To quote the documentation(linked below):  An indirect route is "A route that is via a remote next hop to reach" and a direct route is "A locally connected host prefix (ARP adjacent)"

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-9300-series-switches/217714-understand-ipv4-hardware-resources-on-ca.html 

Happy to help! Please mark as helpful/solution if applicable.
Get in touch: https://torbjorn.dev

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2 Replies 2

Torbjørn
VIP
VIP

Indirect routes are routes that require recursive lookups in the routing table. For example if the next hop address for a BGP route is not in a directly connected network. Exit interface as the next hop would be considered a direct route.

To quote the documentation(linked below):  An indirect route is "A route that is via a remote next hop to reach" and a direct route is "A locally connected host prefix (ARP adjacent)"

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-9300-series-switches/217714-understand-ipv4-hardware-resources-on-ca.html 

Happy to help! Please mark as helpful/solution if applicable.
Get in touch: https://torbjorn.dev

Midfielder
Level 1
Level 1

Great, thank you.

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