Question

You are migrating a large IS-IS backbone from narrow metrics to wide metrics on IOS XR routers. To avoid routing loops and suboptimal paths during the transition, you configure the routers to advertise and accept both TLV formats simultaneously before completing the migration. Which metric-style configuration should you apply during this transition window?

Accepted Answer

metric-style transition, which sends and accepts both old-style and new-style TLVs

Answer

metric-style narrow, which sends and accepts only the legacy 6-bit metric TLVs

Answer

metric-style wide, which immediately sends and accepts only the 32-bit extended metric TLVs

Answer

metric-style wide-only combined with the ignore-attached-bit command to suppress old TLVs