Illustration Of Mst Regions - Cisco Catalyst 2960-XR Configuration Manual

Illustration of MST Regions

Table 9: Prestandard and Standard Terminology
IEEE Standard
CIST regional root
CIST internal root path cost
CIST external root path cost
MSTI regional root
MSTI internal root path cost
Illustration of MST Regions
This figure displays three MST regions and a legacy IEEE 802.1D switch (D). The CIST regional root for
region 1 (A) is also the CIST root. The CIST regional root for region 2 (B) and the CIST regional root for
region 3 (C) are the roots for their respective subtrees within the CIST. The RSTP runs in all regions.
Figure 5: MST Regions, CIST Masters, and CST Root
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
48
Cisco Prestandard
IST master
IST master path cost
Root path cost
Instance root
Root path cost
Configuring Multiple Spanning-Tree Protocol
Cisco Standard
CIST regional root
CIST internal path cost
Root path cost
Instance root
Root path cost
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