Nokia 7210 Configuration Manual page 570

System Management
The following is the allocation scheme implemented for 7210 SAS-R6 and 7210 SAS-R12
IMM-c cards.
The no form of this command specifies that the software does not allocate any resources for
use by IPv6 routes.
Default no max-ipv6-routes
Parameters number — Specifies the maximum amount of entries to be used for IPv6 routes.
570
• Software partitions the hardware table into two - Partition #1 with 4k (4*1204) 32-bit
entries and Partition #2 with 12k (12*1024) entries.
• Partition #1 can fit 128-bit IPv6 address and takes 4 * 32-bit entries each, 32-bit IPv4
entries taking one entry each (1*32-bit entry), and 64-bit IPv6 address taking 4 * 32-bit
entries each; Lets call this L3-FIB-P1.
• Partition #2 can fit 32-bit IPv4 entries taking one entry each, and 64-bit IPv6 address
taking 2 * 32-bit entries each; Lets call this L3-FIB-P2.
• Software reserves space for 256 128-bit IPv6 addresses in partition #1 (L3-FIB-P1);
taking away 1024 32-bit entries and leaving around 3072 32-bit entries for use by either
IPv4 prefixes or IPv6 prefixes. In other words, a maximum of 3072 IPv4 prefixes can fit
in the remaining space if all of them were to be allocated to IPv4 or a maximum of 768
IPv6 (64-bit) prefixes can fit in the remaining space if all of them were to be allocated to
IPv6.; Lets call the remaining space L3-FIB-P1-R.
• Software reserves max-ip-subnets 32-bit entries from partition #2 for use by directly
connected IPv4 and IPv6 interfaces with IPv4/IPv6 address assigned. 'max-ip-subnets'
is a configurable CLI parameter and allows user to reserve the amount of space required
for directly connected IP interfaces. IPv6 directly connected interfaces are allocated
space from this reserved only if the IPv6 address prefix is less than equal to 64-bit. They
are allocated two entries each per IPv6 64-bit address prefix. IPv6 directly connected
interfaces with IPv6 address prefix greater than 64-bit is allocated entries from partition
#1. All IPv4 directly connected IP interfaces are allocated one entry each from this
reserved space. The remaining space is used to store prefixes learned by the node. Lets
call the remaining space L3-FIB-P2-R.
• L3-FIB-P2-R and L3-FIB-P1-R is used for allocating entries towards routes learned by
the node statically or dynamically using a routing protocol. The software starts to allocate
entries from L3-FIB-P2-R for both IPv4 addresses and IPv6 64-bit addresses, until all
the resources are used up. It then allocates entries from L3-FIB-P1-R for both IPv4 and
IPv6 addresses, until all of it is used up.
• If the user has configured max-ipv6-routes, the software reserves space for it in L3-FIB-
P2-R for use by IPv6 routes. The amount of space reserved is equivalent to 2 * max-
ipv6-routes. The remaining space in L3-FIB-P2-R and L3-FIB-P1-R is available for IPv4
routes. For example, if max-ipv6-routes is set to 1000, then 2000 /32-bit entries are
allocated from L3-FIB-P2-R and reserved for IPv6 routes. The rest along with available
entries in L3-FIB-P1-R are available for use by IPv4.
Maximum values can be achieved assuming all the resources are allocated to IPv6
routes.
Values Table 64 lists the parameter values.
Use subject to Terms available at: www.nokia.com
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
© 2021 Nokia.
Configuration Guide
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