Dell Brocade M5424 Brocade 7.1.0 Fabric OS Administrator's Guide - Page 229
Notes on joining a switch to the fabric, Matching fabric-wide consistency policies
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Policy database distribution 7 Notes on joining a switch to the fabric When a switch is joined to a fabric with a tolerant SCC, DCC, or FCS fabric-wide consistency policy, the joining switch must have a matching tolerant SCC, DCC, or FCS fabric-wide consistency policy. If the tolerant SCC, DCC, or FCS fabric-wide consistency policies do not match, the switch can join the fabric, but an error message flags the mismatch. If the tolerant SCC, DCC, and FCS fabric-wide consistency policies match, the corresponding SCC, DCC, and FCS ACL policies are compared. The enforcement of fabric-wide consistency policy involves comparison of the Active policy set. If the ACL polices match, the switch joins the fabric successfully. If the ACL policies are absent either on the switch or on the fabric, the switch joins the fabric successfully, and the ACL policies are copied automatically from where they are present to where they are absent. The Active policy set where it is present overwrites the Active and Defined policy set where it is absent. If the ACL policies do not match, the switch cannot join the fabric and the neighboring E_Ports are disabled. Use the fddCfg --fabwideset command on either this switch or the fabric to set a matching strict SCC, DCC, or FCS fabric-wide consistency policy. Use ACL policy commands to delete the conflicting ACL policy from one side to resolve ACL policy conflict. If neither the fabric nor the joining switch is configured with a fabric-wide consistency policy, there are no ACL merge checks required. Under both conflicting conditions, secPolicyActivate is blocked in the merged fabric. Use the distribute command to explicitly resolve conflicting ACL policies. The descriptions above also apply to joining two fabrics. In this context, the joining switch becomes a joining fabric. Matching fabric-wide consistency policies This section describes the interaction between the databases with active SCC and DCC policies and combinations of fabric-wide consistency policy settings when fabrics are merged. For example: Fabric A with SCC:S;DCC (strict SCC and tolerant DCC) joins Fabric B with SCC:S;DCC (strict SCC and tolerant DCC), the fabrics can merge as long as the SCC policies match, including the order SCC:S;DCC and if both are set to strict. Table 43 describes the impact of merging fabrics with the same fabric-wide consistency policy that have SCC, DCC, or both policies. TABLE 43 Merging fabrics with matching fabric-wide consistency policies Fabric-wide Fabric A consistency policy ACL policies Fabric B ACL policies Merge results Database copied None Tolerant None None None None SCC/DCC None SCC/DCC None SCC/DCC SCC/DCC Succeeds Succeeds Succeeds Succeeds Succeeds No ACL policies copied. No ACL policies copied. No ACL policies copied. ACL policies are copied from B to A. If A and B policies do not match, a warning displays and policy commands are disabled1. Fabric OS Administrator's Guide 229 53-1002745-02
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