Supported Route Table Entries
Cumulus Linux advertises the maximum number of route table entries supported on the switch, including:
- Layer 3 IPv4 LPM entries that have a mask less than /32
- Layer 3 IPv6 LPM entries that have a mask of /64 or less
- Layer 3 IPv6 LPM entries that have a mask greater than /64
- Layer 3 IPv4 neighbor (or host) entries that are the next hops seen in
ip neighbor - Layer 3 IPv6 neighbor entries that are the next hops seen in
ip -6 neighbor - ECMP next hops, which are IP address entries in the routing table that specify the next closest or most optimal router in its routing path
- MAC addresses
To determine the current table sizes on a switch, use cl-resource-query.
Supported Route Entries
Cumulus Linux provides several generalized profiles, described below. These profiles work only with layer 2 and layer 3 unicast forwarding.
The following tables list the number of MAC addresses, layer 3 neighbors, and LPM routes validated for each forwarding table profile. If you do not specify any profiles as described below, the switch uses the default values.
The values provided in the profiles below are the maximum values that Cumulus Linux software allocates; the theoretical hardware limits might be higher. These limits refer to values that have been validated as part of the unidimensional scale validation. If you try to achieve maximum scalability with multiple features enabled, results might differ from the values listed in this guide.
Spectrum 1
Profile |
MAC Addresses | Layer 3 Neighbors |
LPM |
|---|---|---|---|
| default | 40k | 32k (IPv4) and 16k (IPv6) | 64k (IPv4) and 28k (IPv6-long) |
| l2-heavy | 88k | 48k (IPv4) and 40k (IPv6) | 8k (IPv4) and 8k (IPv6-long) |
| l2-heavy-1 | 180K | 8k (IPv4) and 8k (IPv6) | 8k (IPv4) and 8k (IPv6-long) |
| v4-lpm-heavy | 8k | 8k (IPv4) and 16k (IPv6) | 80k (IPv4) and 16k (IPv6-long) |
| v4-lpm-heavy-1 | 8k | 8k (IPv4) and 2k (IPv6) | 176k (IPv4) and 2k (IPv6-long) |
| v6-lpm-heavy | 40k | 8k (IPv4) and 40k (IPv6) | 8k (IPv4), 32k (IPv6-long) and 32K (IPv6/64) |
| lpm-balanced | 8k | 8k (IPv4) and 8k (IPv6) | 60k (IPv4), 60k (IPv6-long) and 120k (IPv6/64) |
Spectrum-2 and Spectrum-3
Profile |
MAC Addresses | Layer 3 Neighbors |
LPM |
|---|---|---|---|
| default | 50k | 41k (IPv4) and 20k (IPv6) | 82k (IPv4), 74k (IPv6-long), 1K (IPv4-Mcast) |
| l2-heavy | 115k | 74k (IPv4) and 37k (IPv6) | 16k (IPv4), 24k (IPv6-long), 1K (IPv4-Mcast) |
| l2-heavy-1 | 239K | 16k (IPv4) and 12k (IPv6) | 16k (IPv4), 16k (IPv6-long), 1K (IPv4-Mcast) |
| l2-heavy-3 | 107k | 90k (IPv4) and 80k (IPv6) | 25k (IPv4), 10k (IPv6-long), 1K (IPv4-Mcast) |
| v4-lpm-heavy | 16k | 41k (IPv4) and 24k (IPv6) | 124k (IPv4), 24k (IPv6-long), 1K (IPv4-Mcast) |
| v4-lpm-heavy-1 | 16k | 16k (IPv4) and 4k (IPv6) | 256k (IPv4), 8k (IPv6-long), 1K (IPv4-Mcast) |
| v6-lpm-heavy | 16k | 16k (IPv4) and 62k (IPv6) | 16k (IPv4), 99k (IPv6-long), 1K (IPv4-Mcast) |
| v6-lpm-heavy-1 | 5k | 4k (IPv4) and 4k (IPv6) | 90k (IPv4), 235k (IPv6-long), 1K (IPv4-Mcast) |
| lpm-balanced | 16k | 16k (IPv4) and 12k (IPv6) | 124k (IPv4), 124k (IPv6-long), 1K (IPv4-Mcast) |
| ipmc-heavy | 57k | 41k (IPv4) and 20k (IPv6) | 82K (IPv4), 66K (IPv6-long), 8K (IPv4-Mcast) |
| ipmc-max | 41K | 41k (IPv4) and 20k (IPv6) | 74K (IPv4), 66K (IPv6-long), 15K (IPv4-Mcast) |
The IPv6 number corresponds to the /64 IPv6 prefix. The /128 IPv6 prefix number is half of the /64 IPv6 prefix number.
For the ipmc-max profile, the cl-resource-query command output displays 33K instead of 15K as the maximum number of IPv4 multicast routes in switchd. 15K is the supported and validated value. You can use the higher value of 33K to test higher multicast scale in non-production environments.
Change Forwarding Resource Profiles
You can set the profile that best suits your network architecture.
Run the nv set system forwarding profile <profile-name> command to specify the profile you want to use.
The following example command sets the l2-heavy profile:
cumulus@switch:~$ nv set system forwarding profile l2-heavy
cumulus@switch:~$ nv config apply
To set the profile back to the default:
cumulus@switch:~$ nv unset system forwarding profile l2-heavy
cumulus@switch:~$ nv config apply
Instead of the above command, you can run the nv set system forwarding profile default command to set the profile back to the default.
Specify the profile you want to use with the forwarding_table.profile variable in the /etc/cumulus/datapath/traffic.conf file. The following example specifies l2-heavy:
cumulus@switch:~$ sudo cat /etc/cumulus/datapath/traffic.conf
...
forwarding_table.profile = l2-heavy
After you specify a different profile, restart switchd for the change to take effect.
To show the different forwarding profiles that your switch supports and the MAC address, layer 3 neighbor, and LPM scale availability for each forwarding profile, run the nv show system forwarding profile-option command.
TCAM Profiles - Spectrum 1
Specify the profile you want to use with the tcam_resource.profile variable in the /etc/mlx/datapath/tcam_profile.conf file. The following example specifies ipmc-max:
cumulus@switch:~$ cat /etc/mlx/datapath/tcam_profile.conf
...
tcam_resource.profile = ipmc-max
After you specify a different profile, restart switchd for the change to take effect.
When you enable nonatomic updates (acl.non_atomic_update_mode is TRUE in the /etc/cumulus/switchd.conf file), the maximum number of mroute and ACL entries for each profile are:
| Profile | Mroute Entries | ACL Entries |
|---|---|---|
| default | 1000 | 500 (IPv6) or 1000 (IPv4) |
| ipmc-heavy | 8500 | 1000 (IPv6) or 1500 (IPv4) |
| acl-heavy | 450 | 2000 (IPv6) or 3500 (IPv4) |
| ipmc-max | 13000 | 1000 (IPv6) or 2000 (IPv4) |
When you disable nonatomic updates (acl.non_atomic_update_mode is FALSE in the /etc/cumulus/switchd.conf file), the maximum number of mroute and ACL entries for each profile are:
| Profile | Mroute Entries | ACL Entries |
|---|---|---|
| default | 1000 | 250 (IPv6) or 500 (IPv4) |
| ipmc-heavy | 8500 | 500 (IPv6) or 750 (IPv4) |
| acl-heavy | 450 | 1000 (IPv6) or 1750 (IPv4) |
| ipmc-max | 13000 | 500 (IPv6) or 1000 (IPv4) |