7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
reserved by this command and the number of entries reserved for IP subnets using the max-
ip-subnets command. See the following bullets for more information.
• On the 7210 SAS-T, the maximum number of IPv4 prefixes without any IPv6 interfaces
configured and IPv6 /64-bit routes (that is, the max-ipv6-routes command is set to a value
of zero) is equal to the maximum size of the route table supported for the platform. Contact a
Nokia representative to learn more about the routing table scaling limits for each 7210 SAS
platform.
Note:
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• On the 7210 SAS-R6 and 7210 SAS-R12 IMMv2 card, 7210 SAS-Sx/S 1/10GE (standalone
and standalone-VC), and 7210 SAS-Mxp, a pool of 4K IPv4 entries are allocated on system
bootup primarily for use by about 256 /128-bit IPv6 addresses. The remaining entries can be
shared with IPv4 prefix, if IPv6 is not enabled on the node. That is, without IPv6 enabled on
the node, the maximum number of IPv4 prefixes possible is equal to the maximum size of the
route table supported for the platform, reduced by 1K entries. The 1K entries correspond to
those reserved by the system for allocation to IPv6 /128-bit addresses.
Note that the maximum number of IPv4 prefixes includes the amount of addresses allocated
for directly connected IP subnets (the user has an option to reserve the amount required for
directly connected IPv4 subnets by configuring the max-ip-subnets command) and IPv4 routes
statically configured on the node or learned dynamically using a routing protocol.
For example, if the maximum size of the route table supported on the node is 32K, the total
number of IPv4 prefixes (including both directly connected subnets and routes statically
configured or dynamically learned using a routing protocol) is 31K (the 1K route entries are
used to allocate up to 256 /128-bit IPv6 addresses). The maximum size of the route table
quoted in the example is for illustration purposes only.
• On the 7210 SAS-R6 and 7210 SAS-R12 IMMv2 card, 7210 SAS-Sx/S 1/10GE (standalone
and standalone-VC), and 7210 SAS-Mxp, the maximum number of IPv4 prefixes possible
with IPv6 /64-bit routes configured is equal to the maximum size that the route table supports
for the platform, reduced by the sum of the number of routes configured for IPv6 /64-bit
prefixes and an amount of 4K entries (reserved for /128-bit IPv6 addresses). The user has an
option to reserve resources used for IPv6 /64-bit prefix using the max-ipv6-routes command.
When max-ipv6-routes is configured using a value greater than zero, the IPv4 prefixes can
no longer use the space reserved for IPv6 /128-bit addresses. The software enforces the
maximum number of IPv6 prefixes possible as less than the max-ipv6-routes value.
Using the preceding example, if the maximum size of the route table supported on the node
is 32K, total number of IPv4 prefixes (only dynamically learned ones using a routing protocol)
is about 25K, assuming max-ipv6-routes is set to 1000 and max-ip-subnets is set to 1000.
That is, 32K – (4K + 2 * 1K + 1K) = 25K (recollect each IPv6 /64-bit route entry requires twice
the space of IPv4 route entry). The maximum size of the route table quoted in the example is
for illustration purposes only.
• On the 7210 SAS-R6 and 7210 SAS-R12 IMMv2 card, 7210 SAS-Sx/S 1/10GE (standalone
and standalone-VC), 7210 SAS-Sx 10/100GE, and 7210 SAS-Mxp, the maximum number of
IPv6 /64-bit routes is equal to the number of routes configured using the max-ipv6-routes
command.
Using the preceding example, if the maximum size of the route table supported on the node
is 32K, maximum number of IPv6 /64-bit prefixes (including only dynamically learned ones,
using a routing protocol) is about 13500, assuming max-ipv6-routes is set to 13K and max-
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