Complex sentence: Several vendors (Cisco, Juniper, Alcatel-Lucent, Huawei, Quagga), now implement the below two extensions to stub and NSSA area and although not covered by RFC they are considered by many to be standard features in OSPF implementations.
Split into simpler sentences: Several vendors (Cisco, Juniper, Alcatel-Lucent, Huawei, Quagga), now implement the two extensions below to stub and NSSA area. Although not covered by RFC, they are considered by many to be standard features in OSPF implementations.