We have two VDCs on this chassis connected to each other via etherchannel. There are 3 x point-to-point VLANs (one per VRF) trunked on the link, and SVIs exist at both ends, with IPv4, IPv6 global, and IPv6 link-local addresses.
Layer 2 is working - both switches can see the other's MAC address. Works on all 3 VLANs. IPv4 is working – ARP entries and OSPF peers between them. Works on all 3 VLANs. IPv6 global addresses are working – both can resolve the other using NDP. Works on all 3 VLANs. IPv6 link-local NOT working on ONE of the VLANs – the two switches are unable to resolve each other via NDP, and OSPFv3 peering gets stuck in 'EXSTART' as a result. The other 2 VLANs on the link are working fine however.
We have run 'debug ipv6 nd VLAN xxxx' on both switches and the log output shows they are both attempting to solicit the other but not receiving anything back.
We've run out of things to look at on the CLI and wondered if there was anything else I should be doing? This was all working fine up until a few days ago we believe.
常见的数据中心之间通信均会采用运营商MSTP/OTN专线进行互联实现通信，由于长途线路价格昂贵通常我们需要最大化使用线路带宽，传统的网络传输中通常是尽力而为传输一旦突发流量较大就会发生线路拥塞的情况，从而影响业务正常通信传输。这时候我们可以采用Qos技术来实现数据中心思科设备之间关键网络流量保障，从而实现链路最大化利用。拓扑图场景如下：如上图，SW01是位于数据中心A的广域网接入Cisco Nexus 3048交换机，SW02是位于数据中心B的广域网接...
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