The output shows two levels of IS-IS databases: Level 1 (L1) and Level 2 (L2). This indicates that the
domain is multi-area, as L1 routers are confined to a single area, while L2 routers can route between
different areas. The presence of Level 1/Level 2 (L1/L2) routers also suggests that the domain spans
multiple areas.
The LSP (Link-State PDU) entries show L1/L2 ATT attributes, which typically indicate that these
routers are capable of routing both within their own area (Level 1) and across areas (Level 2),
suggesting a multi-area design.
The IS-IS domain likely includes broadcast interfaces, as indicated by the "ATT" attribute (typically
referring to the type of interface) and common IS-IS configuration practices on broadcast networks
like Ethernet.
