Re: [mpls-linux-devel] quagga-ldp successful build

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Hello Renato,

I did apply Vasu's patches. but for some reason they never made it
to the public repo.  I will try to get that fixed.

On Tue, Jan 19, 2010 at 11:46:55PM -0200, Renato Westphal wrote:
> Many people here have reported problems with quagga compilation with
> mpld/ldp support. AFAIK the developer Vasu Dasari submitted a patch for both
> the quagga-tree and ldp-portable tree, but only the ldp-portable patch were
> added to the git repo. This may be what breaked the build-system.
> So applying Vasu's path (link below) manually to the mpls-quagga tree and
> following the traditional steps did it.
> 
> Vasu's patch for quagga:
> http://sourceforge.net/mailarchive/attachment.php?list_name=mpls-linux-devel&message_id=65d0eee90906110946q36579ee7l1b9b1e15ef255ba6%40mail.gmail.com&counter=2
> 
> Compilation how-to (debian approach):
> 
> 1)
> //download and extract the quagga-mpls and quagga-ldp-portable trees:
> $ git clone git://repo.or.cz/mpls-quagga.git
> $ git clone git://repo.or.cz/mpls-ldp-portable.git
> //applying "git archive master | bzip2 > ./mpls-xxx.tar.bz2" is not strictly
> necessary
> 
> //apply the Vasu's patch for quagga:
> $ cd mpls-quagga
> $ patch -p1 < ../0001-Quagga-MPLS-fixes-and-improvements.patch
> 
> 2)
> //compilations requirements
> # apt-get install gawk
> # apt-get install libreadline-dev
> # apt-get install build-essential autoconf libtool
> //to convert .dia doc files to .png
> # apt-get install dia texinfo
> 
> 3)
> //another point now is that the build-system will look at "/usr/include" by
> default
> //to search for the mpls-linux headers, but our mpls-kernel includes should
> be at
> //something like "/usr/src/linux-2.6.27.24/include"
> //I dont know how to fix it but there is a workaround:
> 
> First, open the configure.ac script and add "-I
> /usr/src/kernel-2.6.27.24/include" (or whatever is your dir) to the gcc
> cflags (line 123).
> Now gcc will correctly include the mpls headers, but the configure script
> will continue to look on /usr/include, so we have to edit the configure.ac:
> 
> Change...
> <i>dnl ----------
> dnl MPLS check
> dnl ----------
> MPLS_METHOD=""
> AC_MSG_CHECKING(whether this OS has MPLS stack)
> AM_CONDITIONAL(MPLS_ENABLED, test "x${enable_mpls}" != "xno")
> if test "${enable_mpls}" = "no"; then
>   enable_ldpd="no"
>   enable_rsvpd="no"
>   AC_MSG_RESULT(disabled)
> else
>   if test "x${enable_mpls}" = "xnull"; then
>     AC_DEFINE(HAVE_MPLS,1,Enable MPLS)
>     MPLS_METHOD="mpls_null.o"
>     AC_MSG_RESULT(MPLS Null)
>   else
>     AC_EGREP_CPP(yes, [
>     #include <linux/mpls.h>
>     #if MPLS_LINUX_VERSION
>     yes
>     #endif],
>     [AC_DEFINE(HAVE_MPLS,1,Enable MPLS)
>      AC_DEFINE(LINUX_MPLS,1,Linux MPLS)
>      MPLS_METHOD="mpls_netlink.o"
>      AC_MSG_RESULT(MPLS Linux)],
>     [enable_ldpd="no"
>      enable_rsvpd="no"
>      AC_MSG_RESULT(no)]
>     )
>   fi
> fi
> AC_SUBST(MPLS_METHOD)</i>
> 
> to...
> <i>
> dnl ----------
> dnl MPLS check
> dnl ----------
> MPLS_METHOD=""
> AC_MSG_CHECKING(whether this OS has MPLS stack)
> AM_CONDITIONAL(MPLS_ENABLED, test "x${enable_mpls}" != "xno")
> if test "${enable_mpls}" = "no"; then
>   enable_ldpd="no"
>   enable_rsvpd="no"
>   AC_MSG_RESULT(disabled)
> else
>   if test "x${enable_mpls}" = "xnull"; then
>     AC_DEFINE(HAVE_MPLS,1,Enable MPLS)
>     MPLS_METHOD="mpls_null.o"
>     AC_MSG_RESULT(MPLS Null)
>   else
> #    AC_EGREP_CPP(yes, [
> #    #include <linux/mpls.h>
> #    #if MPLS_LINUX_VERSION
> #    yes
> #    #endif],
> #    [
>     AC_DEFINE(HAVE_MPLS,1,Enable MPLS)
>      AC_DEFINE(LINUX_MPLS,1,Linux MPLS)
>      MPLS_METHOD="mpls_netlink.o"
>      AC_MSG_RESULT(MPLS Linux)
> #                ],
> #    [enable_ldpd="no"
> #     enable_rsvpd="no"
> #     AC_MSG_RESULT(no)]
> #   )
>   fi
> fi
> AC_SUBST(MPLS_METHOD)
> </i>
> 
> 
> 4)
> $ cd mpls-quagga/ldpd
> $ nano ./create-links
> //now modify 'create-links' to point DEFSRC to the ldp-portable folder
> $ ./create-links
> $ cd ..
> $ autoreconf -i
> $ ./configure --sysconfdir=/usr/local/quagga
> --localstatedir=/usr/local/quagga --enable-vtysh --enable-netlink
> --enable-mpls --enable-ldpd --disable-rsvpd
> 
> //memtypes.h and route_types.h are defined as targets on the makefiles but
> for
> //some reason they are not been processed by awk, so we have to make it
> manually
> //this have been corrected on the quagga 0.99.13 release
> $ gawk -f ./lib/memtypes.awk ./lib/memtypes.c > ./lib/memtypes.h
> $ gawk -f ./lib/route_types.awk ./lib/route_types.txt > ./lib/route_types.h
> 
> 5)
> $ make
> # mkdir /usr/local/quagga
> # make install
> 
> 6)
> # adduser quagga
> # chown quagga:quagga /usr/local/quagga
> $ cd /usr/local/quagga/
> # cp zebra.conf.sample zebra.conf
> # touch ldpd.conf
> 
> 7)
> //sometimes we have the dev files but not the lib itself
> # apt-get install libcap2-bin
> 
> //type "ldd /usr/local/sbin/zebra"
> //if appears "libzebra.so.0 => not found", then:
> # cp /usr/local/lib/libzebra.* /lib/
> 
> 8)
> //now...
> $ zebra -d -A 127.0.0.1
> $ ldpd -d -A 127.0.0.1
> $ vtysh
> 
> //inside vtysh you can play a little
> lsr#mpls show forwarding
> lsr#conf t
> lsr(config)#mpls static 0
> lsr(config)#label-map ...
> 
> -----x--------
> 
> Despite the successful compilation, i had some problems. MPLS/LDP commands
> were available on the quagga CLI but some of them dont work as expected. I
> will list some issues i've faced:
> 
> 1 - It's not possible to build the quagga with mpls support if the
> '--disable-ipv6' flag is given to the configure script. Actually the
> build-system isn't very good at all, if we enable mpls and disable ldp, for
> example, the ldp commands are still available on the zebra daemon. This
> should be fixed.
> 
> 2 - Mpls "show" commands are ok but sometimes when I try to change some
> configuration the following error comes up:
> Warning: closing connection to zebra because of an I/O error! (btw this
> should be a error not a warning!)
> Using strace its possible to see that this happens at a 'read' system call
> which should return one file descriptor but returns 0. The fix of this error
> is hard and requires a good knowledge of the quagga/zebra framewok.
> 
> 3 - After enabling LDP, I can't see any "LDP Hello Messages" on wireshark.
> 
> 4 - After typing the following:
> lsr(config)# mpls static 0
> lsr(config-ls)# label-map gen 16 swap gen 17 nexthop eth1 192.168.3.1
> 
> The 'mpls ilm/nhlfe/xc show' still empty, maybe I'm missing something?
> 
> 5 - Changing any configuration on zebra causes the daemon to starts
> consuming about 99% of the CPU!
> 
> 6 - The software is very unstable, vtysh freezes frequently and I need to
> "killall -9 zebra; killall vtysh" to come back.
> 
> I'm working to port the mpls+ldp code to the quagga 0.99.15, many bug fixes
> were made on the quagga tree and maybe this may help to we have more luck
> next time! Any help would be appreciated.
> 
> (sorry for my english)
> 
> Regards,
> Renato Westphal

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-- 
James R. Leu
jl...@mi...