Brocade Communications Systems FastIron X Series User Manual

Limiting the number of hops an IPv6 packet can
traverse
By default, the maximum number of hops an IPv6 packet can traverse is 64. You can change this value to between 0 - 255 hops. For
example, to change the maximum number of hops to 70, enter the following command.
device(config)#ipv6 hop-limit 70
Syntax: [no] ipv6 hop-limit number
Use the no form of the command to restore the default value.
hop-limit 0 will transmit packets with default (64) hop limit.
number can be from 0 - 255.
IPv6 source routing security enhancements
The IPv6
specication (RFC 2460) species support for IPv6 source-routed packets using a type 0 Routing extension header, requiring
device and host to process the type 0 routing extension header. However, this requirement may leave a network open to a DoS attack.
A security enhancement disables sending IPv6 source-routed packets to IPv6 devices. (This enhancement conforms to RFC 5095.)
By default, when the router drops a source-routed packet, it sends an ICMP Parameter Problem (type 4), Header Error (code 0) message
to the packet's source address, pointing to the unrecognized routing type. To disable these ICMP error messages, enter the following
command:
device(config)# no ipv6 icmp source-route
Syntax: [no] ipv6 icmp source-route
Use the ipv6 icmp source-route form of the command to enable the ICMP error messages.
TCAM space on FCX device conguration
FCX devices store routing information for IPv4 and IPv6 and GRE tunnel information in the same TCAM table. You can congure the
amount of TCAM space to allocate for IPv4 routing information and GRE tunnels. The remaining space is allocated automatically for
IPv6 routing information.
FCX devices have TCAM space to store 16,000 IPv4 route entries. Each IPv6 route entry and GRE tunnel use as much storage space
as four IPv4 route entries. The default, maximum, and minimum allocation values for each type of data are shown in TCAM space on
FCX device conguration.
TABLE 31 TCAM space allocation on FCX and ICX devices (except ICX 6450)
Default Maximum Minimum
IPv4 route entries 12000 15168 4096
IPv6 route entries 908 2884 68
GRE tunnels 16 64 16
TCAM space on FCX device conguration
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 177

Brocade Communications Systems FastIron X Series Specifications

General

Brand	Brocade Communications Systems
Model	FastIron X Series
Category	Switch
Language	English