be lazy! 
use Net::OpenSSH;

my $hostname ='50.10.0.11';
my $username ='root';
my $password ="mypassword";
my $timeout = 15;
my $mac = "00:25:B5:11:11:12";

my $ssh = Net::OpenSSH->new($hostname, timeout => $timeout,
                            user => $username, password => $password);
$ssh->error and die "unable to connect to remote host: " . $ssh->error
+;

my ($dhcpip) = $ssh->capture("grep -i $mac /var/log/messages | grep DH
+CPACK | awk {'print \$8'} |uniq");
$ssh->error and die "remote command failed: " . $ssh->error;
chomp $dhcpip;

my @tr_output = $ssh->capture("traceroute $dhcpip | awk '{print \$2}'"
+);
$ssh->error and die "remote command failed: " . $ssh->error;
print "TRACEROUTE OUTPUT = @tr_output\n";
if(grep(/$dhcpip/,@tr_output)) {
    print "Trace route Success.. DHCP-IP = $dhcpip\n";
} else {
    print "Trace route : FAIL\n";
}

[download]

update: BTW, the problem in your script is that you are using the traceroute command, which contains metacharacters (specifically, |), as a regular expression. Quote it using quotemeta or just use eq instead of a regex match operation.

In reply to Re: Output from Expect-SSH session is all jumbled by salva
in thread Output from Expect-SSH session is all jumbled by ksudheer123

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