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-rw-r--r--src/vnet/ip/ip6_packet.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/vnet/ip/ip6_packet.h b/src/vnet/ip/ip6_packet.h
index 9916f3000cb..70c3dab473d 100644
--- a/src/vnet/ip/ip6_packet.h
+++ b/src/vnet/ip/ip6_packet.h
@@ -360,6 +360,7 @@ ip6_set_traffic_class_network_order (ip6_header_t * ip6, u8 dscp)
{
u32 tmp =
clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label);
+ tmp &= 0xf00fffff;
tmp |= (dscp << 20);
ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (tmp);
}