documentation:examples:ecmp
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documentation:examples:ecmp [2020/01/14 01:23] – [VM 6 (server)] olivier | documentation:examples:ecmp [2020/09/19 17:39] – [VM 2 (ECMP router)] olivier | ||
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====== Equal-cost multi-path routing (ECMP) ====== | ====== Equal-cost multi-path routing (ECMP) ====== | ||
- | This lab show an ECMP (feature called RADIX_MPATH on FreeBSD) | + | This lab is testing new ECMP routing |
===== Presentation ===== | ===== Presentation ===== | ||
Line 110: | Line 110: | ||
VM 2 is a router with ECMP: 2 static routes toward the same destination but using 2 different next-hop. | VM 2 is a router with ECMP: 2 static routes toward the same destination but using 2 different next-hop. | ||
- | Need to disable fastforward by re-enabling ICMP redirect (disabled on BSDRP by default). | ||
< | < | ||
Line 130: | Line 129: | ||
ipv6_route_VM4VM6=" | ipv6_route_VM4VM6=" | ||
ipv6_route_VM4VM5=" | ipv6_route_VM4VM5=" | ||
- | sed -i '' | ||
- | sed -i '' | ||
- | sysctl net.inet.ip.redirect=1 | ||
- | sysctl net.inet6.ip6.redirect=1 | ||
service hostname restart | service hostname restart | ||
service netif restart | service netif restart | ||
Line 140: | Line 135: | ||
</ | </ | ||
- | And first problem using static route: | + | Checking |
< | < | ||
- | add net 10.0.56.0: gateway 10.0.23.3 fib 0 | + | [root@VM2]~# |
- | add net 10.0.35.0: gateway 10.0.23.3 fib 0 | + | 10.0.56.0/24 10.0.24.4 |
- | add net 10.0.56.0: gateway | + | 10.0.56.0/24 10.0.23.3 |
- | add net 10.0.45.0: gateway | + | [root@VM2]~# |
- | add net 2001: | + | |
- | add net 2001: | + | |
- | add net 2001: | + | |
- | add net 2001: | + | |
- | [root@VM2]~# | + | |
route to: 10.0.56.0 | route to: 10.0.56.0 | ||
destination: | destination: | ||
mask: 255.255.255.0 | mask: 255.255.255.0 | ||
- | gateway: 10.0.23.3 | + | gateway: 10.0.24.4 |
fib: 0 | fib: 0 | ||
- | interface: | + | interface: |
flags: < | flags: < | ||
| | ||
- | | + | |
+ | |||
+ | [root@VM2]~# | ||
+ | Nexthop data | ||
+ | |||
+ | Internet: | ||
+ | Idx | ||
+ | 1 v4/resolve 127.0.0.1 | ||
+ | 2 | ||
+ | 3 | ||
+ | 4 | ||
+ | 5 | ||
+ | 6 | ||
+ | 7 | ||
+ | 8 v4/gw 10.0.23.2 | ||
+ | 9 v4/gw 10.0.24.2 | ||
+ | |||
+ | [root@VM2]~# | ||
+ | route to: 2001: | ||
+ | destination: | ||
+ | mask: ffff: | ||
+ | gateway: 2001: | ||
+ | fib: 0 | ||
+ | interface: vtnet2 | ||
+ | flags: < | ||
+ | | ||
+ | | ||
</ | </ | ||
==== VM 3 (router) ==== | ==== VM 3 (router) ==== | ||
Line 228: | Line 244: | ||
ipv6_route_VM4VM1=" | ipv6_route_VM4VM1=" | ||
ipv6_route_VM4VM2=" | ipv6_route_VM4VM2=" | ||
- | sed -i '' | ||
- | sed -i '' | ||
- | sysctl net.inet.ip.redirect=1 | ||
- | sysctl net.inet6.ip6.redirect=1 | ||
service hostname restart | service hostname restart | ||
service netif restart | service netif restart | ||
Line 268: | Line 280: | ||
==== Testing Load balancing ==== | ==== Testing Load balancing ==== | ||
- | Flows from VM1 to VM6 should be load-balanced | + | Flows from VM1 to VM6 should be "flow-id shared" |
Using ping record feature like with this example: | Using ping record feature like with this example: | ||
< | < | ||
[root@VM1]~# | [root@VM1]~# | ||
PING 10.0.56.26 (10.0.56.26) from 10.0.12.21: 56 data bytes | PING 10.0.56.26 (10.0.56.26) from 10.0.12.21: 56 data bytes | ||
- | 64 bytes from 10.0.56.26: icmp_seq=0 ttl=61 time=0.358 ms | + | 64 bytes from 10.0.56.26: icmp_seq=0 ttl=61 time=0.455 ms |
- | RR: 10.0.23.2 | + | RR: 10.0.24.2 |
- | 10.0.35.3 | + | 10.0.45.4 |
10.0.56.5 | 10.0.56.5 | ||
10.0.56.26 | 10.0.56.26 | ||
- | 10.0.35.5 | + | 10.0.45.5 |
- | 10.0.23.3 | + | 10.0.24.4 |
10.0.12.2 | 10.0.12.2 | ||
10.0.12.21 | 10.0.12.21 | ||
Line 285: | Line 297: | ||
--- 10.0.56.26 ping statistics --- | --- 10.0.56.26 ping statistics --- | ||
1 packets transmitted, | 1 packets transmitted, | ||
- | round-trip min/ | + | round-trip min/ |
</ | </ | ||
^ Source ^ Destination ^ Ongoing path selected by VM2 ^ Returning path selected by VM5^ | ^ Source ^ Destination ^ Ongoing path selected by VM2 ^ Returning path selected by VM5^ | ||
- | | 10.0.12.1 | 10.0.56.6 | VM3 | VM3 | | + | | 10.0.12.1 | 10.0.35.5 | VM3 | VM4 | |
- | | 10.0.12.11 | 10.0.56.16 | VM3 | VM3 | | + | | 10.0.12.1 | 10.0.45.5 | VM4 | VM4 | |
- | | 10.0.12.21 | 10.0.56.26 | VM3 | VM3 | | + | | 10.0.12.1 | 10.0.56.6 | VM4 | VM4 | |
- | | 10.0.12.31 | 10.0.56.36 | VM3 | VM3 | | + | | 10.0.12.11 | 10.0.56.16 | VM4 | VM4 | |
- | | 10.0.12.41 | 10.0.56.46 | VM3 | VM3 | | + | | 10.0.12.21 | 10.0.56.26 | VM4 | VM4 | |
- | | 10.0.12.51 | 10.0.56.56 | VM3 | VM3 | | + | | 10.0.12.31 | 10.0.56.36 | VM4 | VM4 | |
- | | 2001: | + | | 10.0.12.41 | 10.0.56.46 | VM4 | VM4 | |
- | | 2001: | + | | 10.0.12.51 | 10.0.56.56 | VM4 | VM4 | |
- | | 2001: | + | | 2001: |
- | | 2001: | + | | 2001: |
- | | 2001: | + | | 2001: |
- | | 2001: | + | | 2001: |
- | | 10.0.12.1 | 10.0.45.5 | VM4 | VM3 | | + | | 2001: |
+ | | 2001: | ||
- | < | ||
+ | Notice inet6 bug: Cannot ping itself neither neighbor | ||
+ | < | ||
+ | [root@VM1]~# | ||
+ | vtnet0: flags=8943< | ||
+ | options=80028< | ||
+ | inet6 fe80:: | ||
+ | inet6 2001: | ||
+ | inet6 2001: | ||
+ | inet6 2001: | ||
+ | inet6 2001: | ||
+ | inet6 2001: | ||
+ | inet6 2001: | ||
+ | nd6 options=21< | ||
+ | [root@VM1]~# | ||
+ | PING6(56=40+8+8 bytes) fe80:: | ||
+ | |||
+ | --- fe80:: | ||
+ | 1 packets transmitted, | ||
+ | [root@VM1]~# | ||
+ | ping6: illegal number of packets -- 12001: | ||
+ | [root@VM1]~# | ||
+ | PING6(56=40+8+8 bytes) 2001: | ||
+ | |||
+ | --- 2001: | ||
+ | 1 packets transmitted, | ||
+ | </ | ||
+ | |||
+ | ==== Testing Fail Over ==== | ||
+ | |||
+ | VM4 is the preferred hop, so shutdown this VM to check behavior: | ||
+ | |||
+ | < | ||
+ | [root@VM4]~# | ||
+ | Shutdown NOW! | ||
+ | </ | ||
+ | |||
+ | < | ||
+ | [root@VM2]~# | ||
+ | Nexthop data | ||
+ | |||
+ | Internet: | ||
+ | Idx | ||
+ | 4 | ||
+ | 6 | ||
+ | 2 | ||
+ | 1 | ||
+ | 7 | ||
+ | 5 | ||
+ | 3 | ||
+ | 9 v4/gw 10.0.24.2 | ||
+ | 8 v4/gw 10.0.23.2 | ||
+ | Nexthop groups data | ||
+ | BUF: 192 | ||
+ | |||
+ | Internet: | ||
+ | MpIdx NHIdx Weigh Slots Gateway Netif Refcnt | ||
+ | 1 ---- ---- ---- ---- ---- 1 | ||
+ | 9 | ||
+ | 8 | ||
+ | </ | ||
+ | |||
+ | < | ||
+ | [root@VM1]~# | ||
+ | PING 10.0.56.26 (10.0.56.26) from 10.0.12.21: 56 data bytes | ||
+ | |||
+ | --- 10.0.56.26 ping statistics --- | ||
+ | 1 packets transmitted, | ||
+ | </ |
documentation/examples/ecmp.txt · Last modified: 2024/03/28 23:19 by olivier