#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Test VxLAN flooding. The device stores flood records in a singly linked list
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# where each record stores up to three IPv4 addresses of remote VTEPs. The test
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# verifies that packets are correctly flooded in various cases such as deletion
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# of a record in the middle of the list.
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#
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# +--------------------+
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# | H1 (vrf) |
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# | + $h1 |
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# | | 203.0.113.1/24|
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# +----|---------------+
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# |
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# +----|----------------------------------------------------------------------+
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# | SW | |
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# | +--|--------------------------------------------------------------------+ |
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# | | + $swp1 BR0 (802.1d) | |
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# | | | |
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# | | + vxlan0 (vxlan) | |
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# | | local 198.51.100.1 | |
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# | | remote 198.51.100.{2..13} | |
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# | | id 10 dstport 4789 | |
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# | +-----------------------------------------------------------------------+ |
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# | |
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# | 198.51.100.0/24 via 192.0.2.2 |
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# | |
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# | + $rp1 |
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# | | 192.0.2.1/24 |
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# +----|----------------------------------------------------------------------+
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# |
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# +----|--------------------------------------------------------+
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# | | R2 (vrf) |
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# | + $rp2 |
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# | 192.0.2.2/24 |
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# | |
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# +-------------------------------------------------------------+
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lib_dir=$(dirname $0)/../../../net/forwarding
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ALL_TESTS="flooding_test"
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NUM_NETIFS=4
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source $lib_dir/tc_common.sh
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source $lib_dir/lib.sh
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h1_create()
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{
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simple_if_init $h1 203.0.113.1/24
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}
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h1_destroy()
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{
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simple_if_fini $h1 203.0.113.1/24
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}
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switch_create()
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{
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# Make sure the bridge uses the MAC address of the local port and
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# not that of the VxLAN's device
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ip link add dev br0 type bridge mcast_snooping 0
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ip link set dev br0 address $(mac_get $swp1)
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ip link add name vxlan0 type vxlan id 10 nolearning noudpcsum \
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ttl 20 tos inherit local 198.51.100.1 dstport 4789
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ip address add 198.51.100.1/32 dev lo
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ip link set dev $swp1 master br0
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ip link set dev vxlan0 master br0
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ip link set dev br0 up
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ip link set dev $swp1 up
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ip link set dev vxlan0 up
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}
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switch_destroy()
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{
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ip link set dev vxlan0 down
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ip link set dev $swp1 down
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ip link set dev br0 down
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ip link set dev vxlan0 nomaster
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ip link set dev $swp1 nomaster
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ip address del 198.51.100.1/32 dev lo
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ip link del dev vxlan0
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ip link del dev br0
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}
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router1_create()
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{
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# This router is in the default VRF, where the VxLAN device is
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# performing the L3 lookup
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ip link set dev $rp1 up
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ip address add 192.0.2.1/24 dev $rp1
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ip route add 198.51.100.0/24 via 192.0.2.2
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}
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router1_destroy()
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{
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ip route del 198.51.100.0/24 via 192.0.2.2
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ip address del 192.0.2.1/24 dev $rp1
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ip link set dev $rp1 down
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}
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router2_create()
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{
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# This router is not in the default VRF, so use simple_if_init()
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simple_if_init $rp2 192.0.2.2/24
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}
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router2_destroy()
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{
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simple_if_fini $rp2 192.0.2.2/24
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}
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setup_prepare()
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{
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h1=${NETIFS[p1]}
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swp1=${NETIFS[p2]}
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rp1=${NETIFS[p3]}
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rp2=${NETIFS[p4]}
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vrf_prepare
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h1_create
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switch_create
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router1_create
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router2_create
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forwarding_enable
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}
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cleanup()
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{
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pre_cleanup
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forwarding_restore
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router2_destroy
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router1_destroy
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switch_destroy
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h1_destroy
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vrf_cleanup
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}
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flooding_remotes_add()
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{
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local num_remotes=$1
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local lsb
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local i
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for i in $(eval echo {1..$num_remotes}); do
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lsb=$((i + 1))
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bridge fdb append 00:00:00:00:00:00 dev vxlan0 self \
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dst 198.51.100.$lsb
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done
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}
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flooding_filters_add()
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{
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local num_remotes=$1
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local lsb
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local i
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# Prevent unwanted packets from entering the bridge and interfering
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# with the test.
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tc qdisc add dev br0 clsact
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tc filter add dev br0 egress protocol all pref 1 handle 1 \
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matchall skip_hw action drop
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tc qdisc add dev $h1 clsact
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tc filter add dev $h1 egress protocol all pref 1 handle 1 \
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flower skip_hw dst_mac de:ad:be:ef:13:37 action pass
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tc filter add dev $h1 egress protocol all pref 2 handle 2 \
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matchall skip_hw action drop
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tc qdisc add dev $rp2 clsact
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for i in $(eval echo {1..$num_remotes}); do
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lsb=$((i + 1))
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tc filter add dev $rp2 ingress protocol ip pref $i handle $i \
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flower ip_proto udp dst_ip 198.51.100.$lsb \
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dst_port 4789 skip_sw action drop
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done
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}
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flooding_filters_del()
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{
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local num_remotes=$1
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local i
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for i in $(eval echo {1..$num_remotes}); do
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tc filter del dev $rp2 ingress protocol ip pref $i \
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handle $i flower
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done
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tc qdisc del dev $rp2 clsact
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tc filter del dev $h1 egress protocol all pref 2 handle 2 matchall
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tc filter del dev $h1 egress protocol all pref 1 handle 1 flower
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tc qdisc del dev $h1 clsact
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tc filter del dev br0 egress protocol all pref 1 handle 1 matchall
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tc qdisc del dev br0 clsact
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}
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flooding_check_packets()
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{
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local packets=("$@")
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local num_remotes=${#packets[@]}
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local i
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for i in $(eval echo {1..$num_remotes}); do
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tc_check_packets "dev $rp2 ingress" $i ${packets[i - 1]}
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check_err $? "remote $i - did not get expected number of packets"
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done
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}
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flooding_test()
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{
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# Use 12 remote VTEPs that will be stored in 4 records. The array
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# 'packets' will store how many packets are expected to be received
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# by each remote VTEP at each stage of the test
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declare -a packets=(1 1 1 1 1 1 1 1 1 1 1 1)
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local num_remotes=12
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RET=0
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# Add FDB entries for remote VTEPs and corresponding tc filters on the
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# ingress of the nexthop router. These filters will count how many
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# packets were flooded to each remote VTEP
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flooding_remotes_add $num_remotes
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flooding_filters_add $num_remotes
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# Send one packet and make sure it is flooded to all the remote VTEPs
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$MZ $h1 -q -p 64 -b de:ad:be:ef:13:37 -t ip -c 1
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flooding_check_packets "${packets[@]}"
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log_test "flood after 1 packet"
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# Delete the third record which corresponds to VTEPs with LSB 8..10
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# and check that packet is flooded correctly when we remove a record
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# from the middle of the list
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RET=0
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packets=(2 2 2 2 2 2 1 1 1 2 2 2)
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.8
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.9
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.10
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$MZ $h1 -q -p 64 -b de:ad:be:ef:13:37 -t ip -c 1
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flooding_check_packets "${packets[@]}"
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log_test "flood after 2 packets"
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# Delete the first record and make sure the packet is flooded correctly
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RET=0
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packets=(2 2 2 3 3 3 1 1 1 3 3 3)
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.2
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.3
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.4
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$MZ $h1 -q -p 64 -b de:ad:be:ef:13:37 -t ip -c 1
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flooding_check_packets "${packets[@]}"
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log_test "flood after 3 packets"
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# Delete the last record and make sure the packet is flooded correctly
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RET=0
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packets=(2 2 2 4 4 4 1 1 1 3 3 3)
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.11
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.12
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.13
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$MZ $h1 -q -p 64 -b de:ad:be:ef:13:37 -t ip -c 1
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flooding_check_packets "${packets[@]}"
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log_test "flood after 4 packets"
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# Delete the last record, one entry at a time and make sure single
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# entries are correctly removed
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RET=0
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packets=(2 2 2 4 5 5 1 1 1 3 3 3)
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.5
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$MZ $h1 -q -p 64 -b de:ad:be:ef:13:37 -t ip -c 1
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flooding_check_packets "${packets[@]}"
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log_test "flood after 5 packets"
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RET=0
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packets=(2 2 2 4 5 6 1 1 1 3 3 3)
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.6
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$MZ $h1 -q -p 64 -b de:ad:be:ef:13:37 -t ip -c 1
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flooding_check_packets "${packets[@]}"
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log_test "flood after 6 packets"
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RET=0
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packets=(2 2 2 4 5 6 1 1 1 3 3 3)
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bridge fdb del 00:00:00:00:00:00 dev vxlan0 self dst 198.51.100.7
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$MZ $h1 -q -p 64 -b de:ad:be:ef:13:37 -t ip -c 1
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flooding_check_packets "${packets[@]}"
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log_test "flood after 7 packets"
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flooding_filters_del $num_remotes
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}
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trap cleanup EXIT
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setup_prepare
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setup_wait
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tests_run
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exit $EXIT_STATUS
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