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    FRR - BGP - Multi-Path/ECMP

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    • J
      jchinyou
      last edited by

      HI All,

      I've got a simple setup that I seem to struggle getting to work correctly.

      I have a single PFSense box running FRR. It is connected to OSPF on the LAN side and BGP peered over 2x VPN connections.

      I can't seem to find a way to enable BGP Multi-Path/Load-Sharing over my 2 VPN links. Anyone know how to do this? Searching seems to have been fruitless. :(

      LAN <-> PFSense <-> 2x VPN Tunnels <-> 2x Remote Routers (Single AS across both Remote Routers)

      BGP via FRR only puts a single route in the routing table. No ECMP.

      Is there a way to enable ECMP?

      C 1 Reply Last reply Reply Quote 0
      • C
        ChrisT @jchinyou
        last edited by

        @jchinyou Not sure if this is related, but in order to run BGP, you will have first to install OpenBGPD. Go to the System/Package Manager and search for this package.

        For the rest I cannot help because I am currently struggling to make OpenBGPD work.

        NogBadTheBadN 1 Reply Last reply Reply Quote 0
        • NogBadTheBadN
          NogBadTheBad @ChrisT
          last edited by

          @christ said in FRR - BGP - Multi-Path/ECMP:

          @jchinyou Not sure if this is related, but in order to run BGP, you will have first to install OpenBGPD. Go to the System/Package Manager and search for this package.

          For the rest I cannot help because I am currently struggling to make OpenBGPD work.

          Nope.

          "FRR routing daemon for BGP, OSPF, and OSPF6 Conflicts with Quagga OSPF and OpenBGPD. These packages cannot be installed at the same time."

          Andy

          1 x Netgate SG-4860 - 3 x Linksys LGS308P - 1 x Aruba InstantOn AP22

          1 Reply Last reply Reply Quote 2
          • T
            topgun_kebab_hero_1000GTR
            last edited by

            Hi,
            I can also confirm ecmp doesn't seem to be working. It is probably down to the compile options which I think need to explicitly set the ecmp max number of paths.
            Cheers!
            Jon.

            1 Reply Last reply Reply Quote 0
            • D
              donaldsharp
              last edited by

              Hi!

              I'm one of the maintainers of FRR and was asked about this, from the output I was given pfsense compiles FRR w/out any ecmp settings so the ecmp defaults to 1. If you want a higher value FRR needs to be recompiled with --enable-multipath=X where X is the desired max ecmp allowed.

              1 Reply Last reply Reply Quote 1
              • D
                donaldsharp
                last edited by

                To circle back around, I just spoke with a pfsense developer and was informed that pfsense does not support multipath, so this will never work and as such there is no point in changing the way FRR is compiled.

                1 Reply Last reply Reply Quote 0
                • J
                  jwt Netgate
                  last edited by

                  To circle back around again, this is now slated for pfsense 2.5.

                  https://redmine.pfsense.org/issues/9544
                  https://redmine.pfsense.org/issues/9545

                  1 Reply Last reply Reply Quote 1
                  • tom7T
                    tom7
                    last edited by tom7

                    @jchinyou I have faced same issue and tried to build from source FRR in pfsense. Finally I confirmed ECMP works well. Let me share just example procedure how to build FRR7.0-stable in pfsense2.4.
                    pfSense FRR part in GUI partially doesn't work after installing new FRR. Please be careful.

                    #--------------------------------------------------------------------------
# Install FRR6 via pkg
# To generate user, group and /usr/local/etc/rc.d/frr
#--------------------------------------------------------------------------
pkg install -y frr6
 
# rc.conf
cat >> /etc/rc.conf <<EOF
frr_enable="YES"
frr_flags=""
frr_daemons="zebra bgpd"
frr_vtysh_boot="YES"
EOF
 
# generage a file
touch /usr/local/etc/frr/vtysh.conf
touch /usr/local/etc/frr/frr.conf
 
# restart
service frr restart
service frr status
vtysh -c "show version"


#--------------------------------------------------------------------------
# Reference
# http://docs.frrouting.org/projects/dev-guide/en/latest/building-frr-for-freebsd11.html
#--------------------------------------------------------------------------
# Enable FreeBSD repository
cat /etc/pkg/FreeBSD.conf > /usr/local/etc/pkg/repos/FreeBSD.conf
sed -ie "s/{ enabled: no }/{ enabled: yes }/g" /usr/local/share/pfSense/pkg/repos/pfSense-repo.conf
pkg update
 
# Install package
pkg install -y git
pkg install -y autoconf automake libtool gmake
pkg install -y json-c pkgconf bison flex
pkg install -y c-ares texinfo texinfo
pkg install -y py36-pytest py36-sphinx python36
pkg install -y cmake llvm gcc debhelper libyang
# gcc is needed to install build tool like "ld".

#--------------------------------------------------------------------------
# Workaround for build
#--------------------------------------------------------------------------
#/bin/sh: python: not found
#gmake: *** [Makefile:9515: tests/tests.xml] Error 127
ln -s /usr/local/bin/python3.6 /usr/local/bin/python
python --version
# > Python 3.6.8

# To pass gmake check
# Use clang instead of "gcc". PATH should be "cc"
ln -s /usr/local/bin/clang /usr/bin/cc
cc --version
# > clang version 8.0.0 (tags/RELEASE_800/final)
 
# Don't use gcc for compiling. use cc (clang8)
# gmake check will be failed by compiling gcc so use cc(clang8).
# check frr/config.log after compiling
rm /usr/local/bin/gcc

# Copy C-header files from another FreeBSD11 to pfsense
# on FreeBSD11
scp /usr/include/*.h root@PFSENSE:/usr/include
scp -r /usr/include/sys/ root@PFSENSE:/usr/include/
scp -r /usr/include/machine/ root@PFSENSE:/usr/include/
scp -r /usr/include/x86/ root@PFSENSE:/usr/include/
scp -r /usr/include/xlocale root@PFSENSE:/usr/include/
scp -r /usr/include/netinet root@PFSENSE:/usr/include/
scp -r /usr/include/netinet6 root@PFSENSE:/usr/include/
scp -r /usr/include/net root@PFSENSE:/usr/include/
scp -r /usr/include/arpa root@PFSENSE:/usr/include/

#--------------------------------------------------------------------------
# Build FRR
#--------------------------------------------------------------------------
cd /root
git clone https://github.com/frrouting/frr.git frr
cd frr
git branch -a | grep 7.0
git checkout -t origin/stable/7.0
git branch
./bootstrap.sh
setenv MAKE gmake
setenv LDFLAGS -L/usr/local/lib
setenv CPPFLAGS -I/usr/local/include
ln -s /usr/local/bin/sphinx-build-3.6 /usr/local/bin/sphinx-build
./configure \
    --sysconfdir=/usr/local/etc/frr \
    --enable-pkgsrcrcdir=/usr/pkg/share/examples/rc.d \
    --localstatedir=/var/run/frr \
    --prefix=/usr/local \
    --enable-multipath=32 \
    --enable-user=frr \
    --enable-group=frr \
    --enable-vty-group=frrvty \
    --enable-configfile-mask=0640 \
    --enable-logfile-mask=0640 \
    --enable-fpm \
    --with-pkg-git-version \
    --with-pkg-extra-version=-compiled
 
# Compile
gmake -j4
gmake check
 
# Install
gmake install
 
# restart
service frr restart
service frr status
vtysh -c "show version"

# Check
vtysh -c "show ip bgp ipv4 unicast"
#   Network          Next Hop            Metric LocPrf Weight Path
#*= 0.0.0.0/0       xxxx
#*>                       xxxx
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                    • jimpJ
                      jimp Rebel Alliance Developer Netgate
                      last edited by

                      That is an awful way to go about things. Installing a compiler environment on the firewall is a massive security no-no. Spin up a FreeBSD VM and just compile it from ports without all the hoop jumping.

                      Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

                      Need help fast? Netgate Global Support!

                      Do not Chat/PM for help!

                      tom7T 1 Reply Last reply Reply Quote 0
                      • tom7T
                        tom7 @jimp
                        last edited by

                        @jimp I didn't know that compiler environment has security risk. I will only use compiled binary which is copied from FreeBSD to pfsense.

                        1 Reply Last reply Reply Quote 0
                        • P pete35 referenced this topic on
                        • M
                          MarceloAlm_
                          last edited by

                          Hi we are building a similar network and in need to decide between netgate or mikrotik router. There is any chance to enable ecmp on current pfsense?

                          ? 1 Reply Last reply Reply Quote 0
                          • ?
                            A Former User @MarceloAlm_
                            last edited by A Former User

                            @marceloalm_

                            Hi we are building a similar network and in need to decide > between netgate or mikrotik router. There is any chance to > enable ecmp on current pfsense?

                            I would assume that you will be better go with MikroTik
                            RouterOS or VyOS.

                            https://wiki.mikrotik.com/wiki/ECMP_load_balancing_with_masquerade

                            1 Reply Last reply Reply Quote 0
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