Probs with Routing (CentOS7 , KVM)

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Hi there,
I've installed a new KVM-Server. The routing in all instances are only 
working after "arp -s ip_of_router mac_of_router"

Server: CentOS7, KVM
Clients: CentOS6 and Fedora 21

What going wrong?

[root@bgstkvmlr01 ~]# ifconfig 
bond0: flags=5187<UP,BROADCAST,RUNNING,MASTER,MULTICAST>  mtu 1500
        inet6 fe80::3ed9:2bff:fe0b:c706  prefixlen 64  scopeid 0x20<link>
        ether 3c:d9:2b:0b:c7:06  txqueuelen 0  (Ethernet)
        RX packets 7341811  bytes 9977559369 (9.2 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2649574  bytes 3041071431 (2.8 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.20.91.233  netmask 255.255.255.0  broadcast 10.20.91.255
        inet6 fe80::3ed9:2bff:fe0b:c706  prefixlen 64  scopeid 0x20<link>
        ether 3c:d9:2b:0b:c7:06  txqueuelen 0  (Ethernet)
        RX packets 502795  bytes 41156803 (39.2 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 404863  bytes 2871651286 (2.6 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp3s0f0: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        ether 3c:d9:2b:0b:c7:06  txqueuelen 1000  (Ethernet)
        RX packets 7318606  bytes 9975484026 (9.2 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2649122  bytes 3041013575 (2.8 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp3s0f1: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        ether 3c:d9:2b:0b:c7:06  txqueuelen 1000  (Ethernet)
        RX packets 23205  bytes 2075343 (1.9 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 452  bytes 57856 (56.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Lokale Schleife)
        RX packets 587461  bytes 3015361475 (2.8 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 587461  bytes 3015361475 (2.8 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 
192.168.122.255
        ether 52:54:00:04:a7:50  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vnet0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::fc54:ff:fe63:59c4  prefixlen 64  scopeid 0x20<link>
        ether fe:54:00:63:59:c4  txqueuelen 500  (Ethernet)
        RX packets 362  bytes 29416 (28.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3751  bytes 310945 (303.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vnet1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::fc54:ff:fea4:7493  prefixlen 64  scopeid 0x20<link>
        ether fe:54:00:a4:74:93  txqueuelen 500  (Ethernet)
        RX packets 594280  bytes 54135245 (51.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6887388  bytes 9904127165 (9.2 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@bgstkvmlr01 ~]# route -n     
Kernel IP Routentabelle
Ziel            Router          Genmask         Flags Metric Ref    Use 
Iface
0.0.0.0         10.20.91.1      0.0.0.0         UG    0      0        0 
br0
10.20.91.0      0.0.0.0         255.255.255.0   U     0      0        0 
br0
169.254.0.0     0.0.0.0         255.255.0.0     U     1011   0        0 
br0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 
virbr0
[root@bgstkvmlr01 ~]#


Mit freundlichen Grüßen / Kind regards

Mr. Andreas Reschke
MAHLE International GmbH
Unix/Linux-Administration (FIG5.1)

Pragstr. 26 - 46, 70376 Stuttgart, Germany
Phone: +49 711 501-47598, Fax: +49 711 501-44 47598
Mobile: 0173-3197397
andreas.reschke@xxxxxxxxx, http://www.mahle.com

MAHLE International GmbH, Location: Stuttgart, Registered: Amtsgericht 
Stuttgart,  HRB 16413
Management Board: Prof. Dr. Heinz K. Junker, Arnd Franz, Michael Frick, 
Michael Glowatzki
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