Introduction SuperLoop Prevention
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
4-130
4.6.10 SuperLoop Prevention
With interconnected topologies, it is possible to have a condition called a SuperLoop, if all of the following
conditions exist.
• The network has two or more EPSR domains.
• The protected (data) VLAN overlaps two or more EPSR domains.
• The EPSR domains and the overlapping protected VLANs share a common link.
SHOW the status of the EPSR domain.
8
show epsr a0
--- EPSR Domain Information ---
EPSR Domain Name...................... allied
EPSR Domain Node Type................. Transit
EPSR Domain State..................... LINKS-UP
MAC Address of Master Node............ 00:0C:25:1F:80:09
EPSR Domain Status.................... Enabled
Control Vlan.......................... 3501
Enhanced Recovery..................... ON
Ring Interface # 1.................... ETH:[8.0]
Physical State of Ring Interface # 1.. UP
Ring Interface # 1 Type............... UPSTREAM
Ring Interface # 1 State.............. PHYSICALLY FORWARDING
Ring Interface # 1 Priority........... 0
Ring Interface # 1 Priority Rank...... 0
Ring Interface # 2.................... ETH:[8.2]
Physical State of Ring Interface # 2.. UP
Ring Interface # 2 Type............... DOWNSTREAM
Ring Interface # 2 State.............. PHYSICALLY FORWARDING
Ring Interface # 2 Priority........... 0
Ring Interface # 2 Priority Rank...... 0
Data Vlans............................ 3502
TABLE 4-18 Configuration Procedure for EPSR - Configure a Transit Node
Step Command Description/Notes
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