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Cisco Nexus workaround: add probable VPC IP address to device IP address table, determined by checking listening UDP sockets

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This commit is contained in:
Jeroen van Ingen
2014-06-24 17:50:03 +02:00
parent 1ae7f8c8a2
commit 3f7229f4e7
1 changed files with 45 additions and 0 deletions
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45
Info/Layer3/Nexus.pm
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@@ -129,6 +129,12 @@ sub ip_table {
$ip_table{$ip} = $ip; $ip_table{$ip} = $ip;
} }
my $local_addrs = $nexus->_local_addr();
foreach my $addr (keys %$local_addrs) {
$ip_table{$addr} = $addr unless exists $ip_table{$addr};
}
return \%ip_table; return \%ip_table;
} }
@@ -146,6 +152,12 @@ sub ip_index {
$ip_index{$ip} = $index; $ip_index{$ip} = $index;
} }
my $local_addrs = $nexus->_local_addr();
foreach my $addr (keys %$local_addrs) {
$ip_index{$addr} = 0 unless exists $ip_index{$addr};
}
return \%ip_index; return \%ip_index;
} }
@@ -163,6 +175,12 @@ sub ip_netmask {
$ip_netmask{$ip} = $netmask; $ip_netmask{$ip} = $netmask;
} }
my $local_addrs = $nexus->_local_addr();
foreach my $addr (keys %$local_addrs) {
$ip_netmask{$addr} = $local_addrs->{$addr} unless exists $ip_netmask{$addr};
}
return \%ip_netmask; return \%ip_netmask;
} }
@@ -180,9 +198,29 @@ sub ip_broadcast {
$ip_broadcast{$ip} = $broadcast; $ip_broadcast{$ip} = $broadcast;
} }
my $local_addrs = $nexus->_local_addr();
foreach my $addr (keys %$local_addrs) {
$ip_broadcast{$addr} = $addr unless exists $ip_broadcast{$addr};
}
return \%ip_broadcast; return \%ip_broadcast;
} }
sub _local_addr {
my $nexus = shift;
my $listen_addr = $nexus->udpLocalAddress() || {};
my %local_addr;
foreach my $sock (keys %$listen_addr) {
my $addr = $listen_addr->{$sock};
next if ($addr =~ /^127\./); # localhost
next if ($addr eq '0.0.0.0'); # "any"
next if ($addr =~ /^(\d+)\./ and $1 ge 224); # Class D or E space: Multicast or Experimental
$local_addr{$addr} = '255.255.255.255'; # Fictional netmask
}
return \%local_addr;
}
1; 1;
__END__ __END__
@@ -283,6 +321,13 @@ Each entry in this table is an IP address in use on this device. Some
versions do not index the table with the IPv4 address in accordance with versions do not index the table with the IPv4 address in accordance with
the MIB definition, these overrides correct that behavior. the MIB definition, these overrides correct that behavior.
Also, the table is augmented with IP addresses in use by UDP sockets on the
device, as determined by checking F<RFC1213-MIB::udpLocalAddress>. Valid
addresses from this table (any IPv4 that is not localhost, 0.0.0.0, Class D
(multicast) or Class E (experimental) are added as a /32 on interface ID 0.
This is a workaround to determine possible VPC Keepalive IP adresses on the
device, which are probably advertised by CDP/LLDP to neighbors.
=over =over
=item $nexus->ip_index() =item $nexus->ip_index()