7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
ip-subnets is set to 1000. The number of IPv4 routes allowed is zero (32K – (4K + 2 * 13500
+ 1K) = 0 (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.
The following is the allocation scheme implemented for 7210 SAS-R6 and 7210 SAS-R12 IMM-c cards.
• 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.
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. Maximum values can
be achieved assuming all the resources are allocated to IPv6 routes.
Values The following table lists the parameter values.
3HE 18197 AAAB TQZZA
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