多选题Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used betweenPE and CE in MPLS-VPN networks？（）ASite Of Origin SOO.BSHAM links with OSPFCBGP cost communityDBGP feature allow-as inERPF Reverse Path forwarding.FAccess-list Control in Distance Vector protocol like RIP and EIGRP.
多选题
Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used betweenPE and CE in MPLS-VPN networks？（）
A
Site Of Origin SOO.
B
SHAM links with OSPF
C
BGP cost community
D
BGP feature allow-as in
E
RPF Reverse Path forwarding.
F
Access-list Control in Distance Vector protocol like RIP and EIGRP.
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