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local PBR on Huawei AR routers

29 Aug, 2013 IP Routing Leave a comment

Some time ago I wrote about interface policy-based routing PBR. Today I will show you example of local PBR configuration on Huawei AR routers. Local PBR allows you to forward packets through different interfaces or to different hops. Unlike interface PBR, local PBR is used for locally generated packets and classifies packets based on source addresses or packet lengths.

Let’s look at the topology and configure as follows:

  1. Locally generated ICMP packets (with the size of 70-1300 bytes) will be sent to next hop IP address 172.16.0.2.
  2. Locally generated ICMP packets (with the size of 1301-1500 bytes) will be sent to outbound interface GE0/0/1.

Configure IP addresses and static routes to ensure connectivity between loopback interfaces of both routers:

#
 sysname labnario_1
#
interface GigabitEthernet0/0/0
 ip address 172.16.0.1 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 10.1.1.1 255.255.255.0 
#
interface LoopBack0
 ip address 1.1.1.1 255.255.255.255 
#
ip route-static 2.2.2.2 255.255.255.255 10.1.1.2
ip route-static 2.2.2.2 255.255.255.255 172.16.0.2
#

#
 sysname labnario_2
#
interface GigabitEthernet0/0/0
 ip address 172.16.0.2 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 10.1.1.2 255.255.255.0 
#
interface NULL0
#
interface LoopBack0
 ip address 2.2.2.2 255.255.255.255 
#
ip route-static 1.1.1.1 255.255.255.255 10.1.1.1
ip route-static 1.1.1.1 255.255.255.255 172.16.0.1

Configure PBR on labnario_1:

[labnario_1]policy-based-route test permit node 1
[labnario_1-policy-based-route-test-1] if-match packet-length 70 1300 
[labnario_1-policy-based-route-test-1] apply ip-address next-hop 172.16.0.2  
[labnario_1-policy-based-route-test-1]quit 
[labnario_1]policy-based-route test permit node 2
[labnario_1-policy-based-route-test-2] if-match packet-length 1301 1500 
[labnario_1-policy-based-route-test-2] apply output-interface GigabitEthernet0/0/1  
[labnario_1-policy-based-route-test-2]

Enable local PBR on labnario_1:

[labnario_1]ip local policy-based-route test

Reset counters on GE 0/0/0 and 0/0/1 of labnario_1:

<labnario_1>reset counters interface GigabitEthernet 0/0/0
Info: Reset successfully.
<labnario_1>reset counters interface GigabitEthernet 0/0/1
Info: Reset successfully.
<labnario_1>

On labnario_1, ping the IP address of Loopback0 on labnario_2 and set the packet length to 90 bytes:

<labnario_1>ping -c 50 -m 100 -s 90 2.2.2.2

--- 2.2.2.2 ping statistics ---
    50 packet(s) transmitted
    50 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 10/25/300 ms

Let’s check statistic of both GE interfaces of labnario_1:

<labnario_1>dis interface GigabitEthernet 0/0/0
GigabitEthernet0/0/0 current state : UP
Line protocol current state : UP
Last line protocol up time : 2013-08-29 15:09:53 UTC-05:13
Description:HUAWEI, AR Series, GigabitEthernet0/0/0 Interface
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 172.16.0.1/24
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-fc03-c010
Last physical up time   : 2013-08-29 15:09:53 UTC-05:13
Last physical down time : 2013-08-29 15:09:26 UTC-05:13
Current system time: 2013-08-29 16:43:49-05:13
Port Mode: COMMON COPPER
Speed :    0,  Loopback: NONE
Duplex: HALF,  Negotiation: DISABLE
Mdi   : AUTO
Last 300 seconds input rate 176 bits/sec, 0 packets/sec
Last 300 seconds output rate 176 bits/sec, 0 packets/sec
Input peak rate 7504 bits/sec,Record time: 2013-08-29 15:21:13
Output peak rate 7280 bits/sec,Record time: 2013-08-29 15:21:13

Input:  50 packets, 6800 bytes
  Unicast:                 50,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  CRC:                      0,  Giants:                      0
  Jabbers:                  0,  Throttles:                   0
  Runts:                    0,  Symbols:                     0
  Ignoreds:                 0,  Frames:                      0

Output:  50 packets, 6600 bytes
  Unicast:                 50,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  Collisions:               0,  ExcessiveCollisions:         0
  Late Collisions:          0,  Deferreds:                   0

    Input bandwidth utilization threshold : 100.00%
    Output bandwidth utilization threshold: 100.00%
    Input bandwidth utilization  :    0%
    Output bandwidth utilization :    0%

<labnario_1>dis interface GigabitEthernet 0/0/1
GigabitEthernet0/0/1 current state : UP
Line protocol current state : UP
Last line protocol up time : 2013-08-29 15:09:53 UTC-05:13
Description:HUAWEI, AR Series, GigabitEthernet0/0/1 Interface
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 10.1.1.1/24
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-fc03-c011
Last physical up time   : 2013-08-29 15:09:53 UTC-05:13
Last physical down time : 2013-08-29 15:09:26 UTC-05:13
Current system time: 2013-08-29 16:43:57-05:13
Port Mode: COMMON COPPER
Speed :    0,  Loopback: NONE
Duplex: HALF,  Negotiation: DISABLE
Mdi   : AUTO
Last 300 seconds input rate 0 bits/sec, 0 packets/sec
Last 300 seconds output rate 0 bits/sec, 0 packets/sec
Input peak rate 5784 bits/sec,Record time: 2013-08-29 15:19:32
Output peak rate 5768 bits/sec,Record time: 2013-08-29 15:19:32

Input:  0 packets, 0 bytes
  Unicast:                  0,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  CRC:                      0,  Giants:                      0
  Jabbers:                  0,  Throttles:                   0
  Runts:                    0,  Symbols:                     0
  Ignoreds:                 0,  Frames:                      0

Output:  0 packets, 0 bytes
  Unicast:                  0,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  Collisions:               0,  ExcessiveCollisions:         0
  Late Collisions:          0,  Deferreds:                   0

    Input bandwidth utilization threshold : 100.00%
    Output bandwidth utilization threshold: 100.00%
    Input bandwidth utilization  :    0%
    Output bandwidth utilization :    0%

Repeat the same for packets of 1400 bytes:

<labnario_1>ping -c 50 -m 100 -s 1400 2.2.2.2

  --- 2.2.2.2 ping statistics ---
    50 packet(s) transmitted
    50 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 10/22/90 ms

<labnario_1>dis interface GigabitEthernet 0/0/0
GigabitEthernet0/0/0 current state : UP
Line protocol current state : UP
Last line protocol up time : 2013-08-29 15:09:53 UTC-05:13
Description:HUAWEI, AR Series, GigabitEthernet0/0/0 Interface
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 172.16.0.1/24
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-fc03-c010
Last physical up time   : 2013-08-29 15:09:53 UTC-05:13
Last physical down time : 2013-08-29 15:09:26 UTC-05:13
Current system time: 2013-08-29 16:48:29-05:13
Port Mode: COMMON COPPER
Speed :    0,  Loopback: NONE
Duplex: HALF,  Negotiation: DISABLE
Mdi   : AUTO
Last 300 seconds input rate 176 bits/sec, 0 packets/sec
Last 300 seconds output rate 176 bits/sec, 0 packets/sec
Input peak rate 7504 bits/sec,Record time: 2013-08-29 15:21:13
Output peak rate 7280 bits/sec,Record time: 2013-08-29 15:21:13

Input:  50 packets, 6800 bytes
  Unicast:                 50,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  CRC:                      0,  Giants:                      0
  Jabbers:                  0,  Throttles:                   0
  Runts:                    0,  Symbols:                     0
  Ignoreds:                 0,  Frames:                      0

Output:  50 packets, 6600 bytes
  Unicast:                 50,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  Collisions:               0,  ExcessiveCollisions:         0
  Late Collisions:          0,  Deferreds:                   0

    Input bandwidth utilization threshold : 100.00%
    Output bandwidth utilization threshold: 100.00%
    Input bandwidth utilization  :    0%
    Output bandwidth utilization :    0%

<labnario_1>dis interface GigabitEthernet 0/0/1
GigabitEthernet0/0/1 current state : UP
Line protocol current state : UP
Last line protocol up time : 2013-08-29 15:09:53 UTC-05:13
Description:HUAWEI, AR Series, GigabitEthernet0/0/1 Interface
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 10.1.1.1/24
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-fc03-c011
Last physical up time   : 2013-08-29 15:09:53 UTC-05:13
Last physical down time : 2013-08-29 15:09:26 UTC-05:13
Current system time: 2013-08-29 16:48:34-05:13
Port Mode: COMMON COPPER
Speed :    0,  Loopback: NONE
Duplex: HALF,  Negotiation: DISABLE
Mdi   : AUTO
Last 300 seconds input rate 1928 bits/sec, 0 packets/sec
Last 300 seconds output rate 1920 bits/sec, 0 packets/sec
Input peak rate 41640 bits/sec,Record time: 2013-08-29 16:48:34
Output peak rate 40376 bits/sec,Record time: 2013-08-29 16:48:34

Input:  50 packets, 72300 bytes
  Unicast:                 50,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  CRC:                      0,  Giants:                      0
  Jabbers:                  0,  Throttles:                   0
  Runts:                    0,  Symbols:                     0
  Ignoreds:                 0,  Frames:                      0

Output:  50 packets, 72100 bytes
  Unicast:                 50,  Multicast:                   0
  Broadcast:                0,  Jumbo:                       0
  Discard:                  0,  Total Error:                 0

  Collisions:               0,  ExcessiveCollisions:         0
  Late Collisions:          0,  Deferreds:                   0

    Input bandwidth utilization threshold : 100.00%
    Output bandwidth utilization threshold: 100.00%
    Input bandwidth utilization  :    0%
    Output bandwidth utilization :    0%

As you can see, which next hop or outbound interface is chosen depends on the length of locally generated packet. Packets with other lengths are routed based on destination addresses.

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