Here is a sample of what a cleaner (in my opinion) version of your code should look like: 
#...
my @lines = ();
open my $inFile, '<', 'svrrp.txt' or die "Couldn't open svrrp.txt: $!"
+;
my $currIface = "";
while (<$inFile>) {
  chomp;
  if (my $iface = ($_ =~ /^Interface\s(\w+)$/) {
    processlines($currIface, @lines);
    $currIface = $iface;
    @lines = ();
  }
  push @lines, $_;
}
processlines($currIface, $lines); # to process last interface block
#...

sub processlines() {
  my $iface = shift;
  return unless $iface;
  # declare any vars
  foreach (@_) {
    # do your pattern matching here
  }
  # print your findings
}

[download]
You can expand on this to make it suit you.

-imran

In reply to Re^3: Trying to use Spreadsheet::WriteExcel. What could be the problem? by CountOrlok
in thread Trying to use Spreadsheet::WriteExcel. What could be the problem? by sunny

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.