documentation:examples:ecmp
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documentation:examples:ecmp [2020/10/05 10:45] – [Equal-cost multi-path routing (ECMP)] olivier | documentation:examples:ecmp [2022/12/11 18:29] – [R1 (ECMP router)] olivier | ||
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Line 22: | Line 22: | ||
==== Client ==== | ==== Client ==== | ||
- | A simple host with multiples aliases: | + | A simple host with static routes: |
< | < | ||
Line 28: | Line 28: | ||
gateway_enable=NO \ | gateway_enable=NO \ | ||
ipv6_gateway_enable=NO \ | ipv6_gateway_enable=NO \ | ||
- | ifconfig_igb1=" | + | ifconfig_igb1=" |
- | ifconfig_igb1_alias1=" | + | ifconfig_igb1_ipv6=" |
- | ifconfig_igb1_alias2=" | + | static_routes=" |
- | ifconfig_igb1_alias3=" | + | route_LAB=" |
- | ifconfig_igb1_alias4=" | + | ipv6_static_routes=" |
- | ifconfig_igb1_alias5=" | + | ipv6_route_LAB=" |
- | ifconfig_igb1_ipv6=" | + | |
- | ifconfig_igb1_alias61=" | + | |
- | ifconfig_igb1_alias62=" | + | |
- | ifconfig_igb1_alias63=" | + | |
- | ifconfig_igb1_alias64=" | + | |
- | ifconfig_igb1_alias65=" | + | |
- | static_routes=" | + | |
- | route_LAB=" | + | |
- | ipv6_static_routes=" | + | |
- | ipv6_route_LAB=" | + | |
service hostname restart | service hostname restart | ||
service netif restart | service netif restart | ||
Line 55: | Line 45: | ||
< | < | ||
+ | |||
sysrc hostname=R1 \ | sysrc hostname=R1 \ | ||
gateway_enable=YES \ | gateway_enable=YES \ | ||
ipv6_gateway_enable=YES \ | ipv6_gateway_enable=YES \ | ||
- | ifconfig_igb0=" | + | ifconfig_igb0=" |
- | ifconfig_igb0_ipv6=" | + | ifconfig_igb0_ipv6=" |
- | ifconfig_igb1=" | + | ifconfig_igb1=" |
- | ifconfig_igb1_ipv6=" | + | ifconfig_igb1_ipv6=" |
- | ifconfig_igb2=" | + | ifconfig_igb2=" |
- | ifconfig_igb2_ipv6=" | + | ifconfig_igb2_ipv6=" |
static_routes=" | static_routes=" | ||
- | route_MPATH1=" | + | route_MPATH1=" |
- | route_MPATH2=" | + | route_MPATH2=" |
ipv6_static_routes=" | ipv6_static_routes=" | ||
- | ipv6_route_MPATH1=" | + | ipv6_route_MPATH1=" |
- | ipv6_route_MPATH2=" | + | ipv6_route_MPATH2=" |
service hostname restart | service hostname restart | ||
service netif restart | service netif restart | ||
Line 79: | Line 70: | ||
< | < | ||
- | [root@R1]~# # netstat -rn4 | grep 10.0.0.0/ | + | root@R1:~ # netstat -rn4 | grep 10.0.0.0/ |
- | 10.0.0.0/ | + | 10.0.0.0/ |
- | 10.0.0.0/ | + | 10.0.0.0/ |
- | [root@R1]~# route -n get 10.0.0.0/ | + | root@R1:~ # netstat -4onW |
- | route to: 10.0.0.0 | + | |
- | destination: | + | |
- | mask: 255.255.0.0 | + | |
- | gateway: 10.0.112.2 | + | |
- | fib: 0 | + | |
- | interface: igb1 | + | |
- | flags: < | + | |
- | | + | |
- | | + | |
- | + | ||
- | [root@R1]~# netstat -4onW | + | |
Nexthop data | Nexthop data | ||
Internet: | Internet: | ||
Idx | Idx | ||
- | 1 | + | 1 |
- | 2 | + | 2 |
- | 3 | + | 3 |
- | 4 | + | 4 |
- | 5 | + | 5 |
- | 6 | + | 6 |
- | 7 | + | 7 |
- | 8 v4/gw 10.0.112.1 10.0.112.2 GS 0 | + | 8 v4/gw 10.0.231.2 10.0.231.3 GS 0 |
- | 9 v4/gw 10.0.212.1 10.0.212.2 GS 0 | + | 9 v4/gw 10.0.232.2 10.0.232.3 GS 0 |
- | + | ||
- | [root@R1]~# netstat -rn6 | grep 2001: | + | |
- | 2001: | + | |
- | 2001: | + | |
- | + | ||
- | [root@R1]~# route -n6 get 2001: | + | |
- | route to: 2001: | + | |
- | destination: | + | |
- | mask: ffff: | + | |
- | gateway: 2001: | + | |
- | fib: 0 | + | |
- | interface: igb2 | + | |
- | flags: < | + | |
- | | + | |
- | | + | |
- | [root@R1]~# netstat -6onW | + | root@R1:~ # netstat -6onW |
Nexthop data | Nexthop data | ||
Internet6: | Internet6: | ||
Idx | Idx | ||
- | 1 | + | 1 |
- | 2 | + | 2 |
- | 3 | + | 3 |
- | 4 | + | 4 |
- | 5 | + | 5 |
- | 6 | + | 6 |
- | 7 | + | 7 |
- | 8 | + | 8 |
- | 9 v6/resolve 2001: | + | 9 |
- | 10 | + | 10 v6/gw ::1 :: |
- | 11 v6/resolve ::1 | + | 11 v6/gw 2001:db8:231::2 2001:db8:231::3 GS 0 |
- | 12 v6/gw ::1 :: | + | 12 v6/gw 2001:db8:232::2 2001:db8:232::3 GS 0 |
- | 13 v6/gw 2001:db8:112::1 2001:db8:112::2 GS 0 | + | |
- | 14 v6/gw 2001:db8:212::1 2001:db8:212::2 GS | + | |
- | 15 v6/resolve 2001: | + | |
</ | </ | ||
+ | ==== R2 (ECMP router) ==== | ||
- | + | R2 is like R1, a router with ECMP: 2 static routing toward the same destination but using 2 different next-hop.. | |
- | Look like this router will prefer igb1 for inet4 and igb2 for inet6. | + | |
- | + | ||
- | ==== R5 (ECMP router) ==== | + | |
- | + | ||
- | R5 is like R2, a router with ECMP: 2 static routing toward the same destination but using 2 different next-hop.. | + | |
< | < | ||
Line 157: | Line 115: | ||
gateway_enable=YES \ | gateway_enable=YES \ | ||
ipv6_gateway_enable=YES \ | ipv6_gateway_enable=YES \ | ||
- | ifconfig_igb0=" | + | ifconfig_igb0=" |
- | ifconfig_igb0_ipv6=" | + | ifconfig_igb0_ipv6=" |
- | ifconfig_igb1=" | + | ifconfig_igb1=" |
- | ifconfig_igb1_ipv6=" | + | ifconfig_igb1_ipv6=" |
- | ifconfig_igb2=" | + | ifconfig_igb2=" |
- | ifconfig_igb2_ipv6=" | + | ifconfig_igb2_ipv6=" |
- | static_routes=" | + | static_routes=" |
- | | + | |
- | | + | |
- | ipv6_static_routes=" | + | route_SRC1=" |
- | ipv6_route_MPATH1=" | + | route_SRC2=" |
- | ipv6_route_MPATH2=" | + | ipv6_static_routes=" |
+ | ipv6_route_MPATH1=" | ||
+ | ipv6_route_MPATH2=" | ||
+ | ipv6_route_SRC1=" | ||
+ | ipv6_route_SRC2=" | ||
service hostname restart | service hostname restart | ||
service netif restart | service netif restart | ||
Line 174: | Line 136: | ||
config save | config save | ||
</ | </ | ||
- | |||
- | And checking: | ||
- | < | ||
- | # route get 10.0.0.0/16 | ||
- | route to: 10.0.0.0 | ||
- | destination: | ||
- | mask: 255.255.0.0 | ||
- | gateway: 10.0.212.1 | ||
- | fib: 0 | ||
- | interface: igb2 | ||
- | flags: < | ||
- | | ||
- | | ||
- | |||
- | |||
- | # route -6 get 2001: | ||
- | route to: 2001:db8:: | ||
- | destination: | ||
- | mask: ffff:ffff:: | ||
- | gateway: 2001: | ||
- | fib: 0 | ||
- | interface: igb1 | ||
- | flags: < | ||
- | | ||
- | | ||
- | |||
- | </ | ||
- | |||
- | Look like this router will prefer to use igb2 for inet4 and igb1 for inet6. | ||
- | |||
==== Server ==== | ==== Server ==== | ||
- | A simple host with multiple aliases: | + | A simple host with some static routes: |
< | < | ||
Line 212: | Line 144: | ||
gateway_enable=NO \ | gateway_enable=NO \ | ||
ipv6_gateway_enable=NO \ | ipv6_gateway_enable=NO \ | ||
- | | + | |
- | | + | |
- | | + | |
- | | + | |
- | | + | |
- | | + | |
- | | + | |
- | | + | |
- | ifconfig_vr0_alias62=" | + | |
- | | + | |
- | ifconfig_vr0_alias64=" | + | |
- | | + | |
- | static_routes=" | + | |
- | route_LAB=" | + | |
- | ipv6_static_routes=" | + | |
- | ipv6_route_LAB=" | + | |
service hostname restart | service hostname restart | ||
service netif restart | service netif restart | ||
Line 240: | Line 166: | ||
==== R1 (ECMP router) ==== | ==== R1 (ECMP router) ==== | ||
- | In place of static routes, FRR is enabled: | + | In place of static routes, |
< | < | ||
Line 250: | Line 176: | ||
cat > / | cat > / | ||
- | frr version | + | frr version |
frr defaults traditional | frr defaults traditional | ||
- | hostname | + | hostname |
! | ! | ||
interface igb0 | interface igb0 | ||
+ | ip ospf passive | ||
+ | ipv6 ospf6 area 0.0.0.0 | ||
ipv6 ospf6 passive | ipv6 ospf6 passive | ||
+ | exit | ||
+ | ! | ||
+ | interface igb1 | ||
+ | ipv6 ospf6 area 0.0.0.0 | ||
+ | exit | ||
+ | ! | ||
+ | interface igb2 | ||
+ | ipv6 ospf6 area 0.0.0.0 | ||
+ | exit | ||
! | ! | ||
router ospf | router ospf | ||
ospf router-id 1.1.1.1 | ospf router-id 1.1.1.1 | ||
- | passive-interface igb0 | + | |
- | network 10.0.31.0/24 area 0 | + | |
- | | + | |
- | | + | exit |
! | ! | ||
router ospf6 | router ospf6 | ||
- | | + | exit |
- | | + | |
- | | + | |
- | ! | + | |
- | line vty | + | |
! | ! | ||
EOF | EOF | ||
Line 278: | Line 211: | ||
==== R2 (ECMP router) ==== | ==== R2 (ECMP router) ==== | ||
- | In place of static routes, | + | Same as R1 with OSPF and FRR: |
< | < | ||
sysrc frr_vtysh_boot=" | sysrc frr_vtysh_boot=" | ||
Line 289: | Line 222: | ||
frr version 7.4 | frr version 7.4 | ||
frr defaults traditional | frr defaults traditional | ||
- | hostname | + | hostname |
! | ! | ||
interface igb0 | interface igb0 | ||
Line 297: | Line 230: | ||
ospf router-id 2.2.2.2 | ospf router-id 2.2.2.2 | ||
| | ||
- | | + | |
- | | + | |
- | | + | |
! | ! | ||
router ospf6 | router ospf6 | ||
Line 351: | Line 284: | ||
===== Test Load balancing IP packets ===== | ===== Test Load balancing IP packets ===== | ||
- | Flows from the client to the server should be " | + | Flows from the client to the server should be " |
+ | |||
+ | On server: | ||
+ | < | ||
+ | root@server: | ||
+ | </ | ||
+ | |||
+ | On client: | ||
+ | < | ||
+ | root@client: | ||
+ | </ | ||
+ | |||
+ | On R1: | ||
+ | < | ||
+ | systat -ifstat -match igb0, | ||
+ | |||
+ | /0 / | ||
+ | Load Average | ||
+ | |||
+ | Interface | ||
+ | | ||
+ | | ||
+ | |||
+ | | ||
+ | | ||
+ | |||
+ | | ||
+ | | ||
+ | |||
+ | </ | ||
+ | |||
+ | => We confirm that 20 Kps entering igb0 and are equally split by exiting by igb1 and igb2 | ||
+ | |||
+ | On R2: | ||
+ | < | ||
+ | systat -ifstat -match igb0, | ||
+ | |||
+ | /0 / | ||
+ | Load Average | ||
+ | |||
+ | Interface | ||
+ | | ||
+ | | ||
+ | |||
+ | | ||
+ | | ||
+ | |||
+ | | ||
+ | | ||
+ | </ | ||
+ | |||
+ | => R2 has no choice than receiving packets from igb1 and igb2, and forwarding them through igb0. | ||
- | ^ Source ^ Destination ^ Ongoing path selected by R1 ^ Returning path selected by R2^ | ||
- | | 10.0.31.3 | 10.0.24.4 | igb1 | igb2 | | ||
- | | 10.0.31.3 | 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 | igb2 | igb2 | | ||
- | | 10.0.31.43 | 10.0.24.44 | igb1 | igb2 | | ||
- | | 10.0.31.53 | 10.0.24.54 | igb1 | igb1 | | ||
- | | 2001: | ||
- | | 2001: | ||
- | | 2001: | ||
- | | 2001: | ||
- | | 2001: |
documentation/examples/ecmp.txt · Last modified: 2024/03/28 23:19 by olivier