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--- documentation:examples:ecmp [2020/09/21 13:05] – [Testing Load balancing] olivier
+++ documentation:examples:ecmp [2020/09/23 14:56] – [Checking routes installed] olivier
@@ Line 20: / Line 20: @@
 ===== Static routing setup =====
-==== VM 1 (client) ====
+==== Client ====
-VM1 is configured as a simple host with multiples aliases:
+A simple host with multiples aliases:
 <code>
-sysrc hostname=VM1 \
+sysrc hostname=client \
   gateway_enable=NO \
   ipv6_gateway_enable=NO \
@@ Line 50: / Line 50: @@
 </code>
-==== VM 2 (ECMP router) ====
+==== R1 (ECMP router) ====
-VM 2 is a router with ECMP: 2 static routes toward the same destination but using 2 different next-hop.
+R1 is a router with ECMP: 2 static routes toward the same destination but using 2 different next-hop.
 <code>
-sysrc hostname=VM2 \
+sysrc hostname=R1 \
   gateway_enable=YES \
   ipv6_gateway_enable=YES \
@@ Line 79: / Line 79: @@
 <code>
-[root@VM2]~# # netstat -rn4 | grep 10.0.0.0/16
+[root@R1]~# # netstat -rn4 | grep 10.0.0.0/16
 .0.0.0/16        10.0.112.2         UGS        igb1
 .0.0.0/16        10.0.212.2         UGS        igb2
-[root@VM2]~# route -n get 10.0.0.0/16
+[root@R1]~# route -n get 10.0.0.0/16
    route to: 10.0.0.0
 destination: 10.0.0.0
@@ Line 94: / Line 94: @@
          0         0         0      1500         0         0
-[root@VM2]~# netstat -4onW
+[root@R1]~# netstat -4onW
 Nexthop data
@@ Line 109: / Line 109: @@
             v4/gw 10.0.212.1         10.0.212.2         GS            0   1500       igb2               1
-[root@VM2]~# netstat -rn6 | grep 2001:db8::/32
+[root@R1]~# netstat -rn6 | grep 2001:db8::/32
 :db8::/32                     2001:db8:212::2               UGS        igb2
 :db8::/32                     2001:db8:112::2               UGS        igb1
-[root@VM2]~# route -n6 get 2001:db8::/32
+[root@R1]~# route -n6 get 2001:db8::/32
    route to: 2001:db8::
 destination: 2001:db8::
@@ Line 124: / Line 124: @@
          0         0         0      1500         0         0
-[root@VM2]~# netstat -6onW
+[root@R1]~# netstat -6onW
 Nexthop data
@@ Line 149: / Line 149: @@
 Look like this router will prefer igb1 for inet4 and igb2 for inet6.
-==== VM 5 (ECMP router) ====
+==== R5 (ECMP router) ====
-VM 5 is like VM 2, a router with ECMP: 2 static routing toward the same destination but using 2 different next-hop..
+R5 is like R2, a router with ECMP: 2 static routing toward the same destination but using 2 different next-hop..
 <code>
-sysrc hostname=VM5 \
+sysrc hostname=R2 \
   gateway_enable=YES \
   ipv6_gateway_enable=YES \
@@ Line 204: / Line 204: @@
 Look like this router will prefer to use igb2 for inet4 and igb1 for inet6.
-==== VM 6 (server) ====
+==== Server ====
-VM 6, like VM 1 is configured as a simple host with multiple aliases:
+A simple host with multiple aliases:
 <code>
-sysrc hostname=VM6 \
+sysrc hostname=server \
   gateway_enable=NO \
   ipv6_gateway_enable=NO \
@@ Line 234: / Line 234: @@
 </code>
-==== Testing Load balancing ====
+===== FRR Multipath setup =====
+Replacing static routes by FRR (OSPF) compiled with MULTIPATH option.
+==== R1 (ECMP router) ====
+In place of static routes, FRR is enabled:
+<code>
+sysrc frr_vtysh_boot="YES" \
+  frr_enable="YES" \
+  frr_daemons="zebra ospfd ospf6d" \
+  watchfrr_flags=" -d -r /usr/sbin/servicebBfrrbBrestartbB%s -s /usr/sbin/servicebBfrrbBstartbB%s -k /usr/sbin/servicebBfrrbBstopbB%s -b bB -t 30 zebra ospfd ospf6d" \
+  watchfrr_enable="YES"
+cat > /usr/local/etc/frr/frr.conf <EOF
+frr version 7.4
+frr defaults traditional
+hostname router1
+!
+router ospf
+ ospf router-id 1.1.1.1
+ passive-interface igb0
+ network 10.0.31.0/24 area 0
+ network 10.0.112.0/24 area 0
+ network 10.0.212.0/24 area 0
+!
+line vty
+!
+EOF
+service frr start
+service watchfrr start
+</code>
+==== R2 (ECMP router) ====
+In place of static routes, FRR is enabled:
+<code>
+sysrc frr_vtysh_boot="YES" \
+  frr_enable="YES" \
+  frr_daemons="zebra ospfd ospf6d" \
+  watchfrr_flags=" -d -r /usr/sbin/servicebBfrrbBrestartbB%s -s /usr/sbin/servicebBfrrbBstartbB%s -k /usr/sbin/servicebBfrrbBstopbB%s -b bB -t 30 zebra ospfd ospf6d" \
+  watchfrr_enable="YES"
+cat > /usr/local/etc/frr/frr.conf <EOF
+frr version 7.4
+frr defaults traditional
+hostname router2
+!
+router ospf
+ ospf router-id 2.2.2.2
+ passive-interface igb0
+ network 10.0.24.0/24 area 0
+ network 10.0.112.0/24 area 0
+ network 10.0.212.0/24 area 0
+!
+line vty
+!
+EOF
+service frr start
+service watchfrr start
+</code>
+==== Checking routes installed ====
+On R1:
+<code>
+[root@router1]~# vtysh
+Hello, this is FRRouting (version 7.4).
+Copyright 1996-2005 Kunihiro Ishiguro, et al.
+homelab1# sh ip route 10.0.24.0/24
+Routing entry for 10.0.24.0/24
+  Known via "ospf", distance 110, metric 20, best
+  Last update 00:06:39 ago
+  * 10.0.112.2, via igb1, weight 1
+  * 10.0.212.2, via igb2, weight 1
+router1# exit
+[root@router1]~# netstat -rn4 | grep 10.0.24.0/24
+.0.24.0/24       10.0.212.2         UG1        igb2
+.0.24.0/24       10.0.112.2         UG1        igb1
+</code>
+===== Test Load balancing IP packets =====
 Flows from the client to the server should be "flow-id shared" between the 2 paths. Let's check using multiple sources and destination IP addresses.
@@ Line 240: / Line 325: @@
 ^ Source ^ Destination ^ Ongoing path selected by R1 ^ Returning path selected by R2^
 | 10.0.31.3 | 10.0.24.4 | igb1 | igb2 |
-| 10.0.31.13 | 10.0.24.14 | igb1 | igb1 |
+| 10.0.31.3 | 10.0.24.14 | igb2 | igb1 |
+| 10.0.31.13 | 10.0.24.14 | igb2 | igb1 |
 | 10.0.31.23 | 10.0.24.24 | igb1 | igb2 |
-| 10.0.31.33 | 10.0.24.34 | igb1 | igb2 |
+| 10.0.31.33 | 10.0.24.34 | igb2 | igb2 |
-| 10.0.31.43 | 10.0.24.44 | igb1 | igb1 |
 | 10.0.31.43 | 10.0.24.44 | igb1 | igb2 |
+| 10.0.31.53 | 10.0.24.54 | igb1 | igb1 |
 | 2001:db8:31::3 | 2001:db8:24::4 | igb1 | igb1 |
 | 2001:db8:31::13 | 2001:db8:24::14 | igb1 | igb2 |