5
Q.
Why can't two devices communicate if they are connected through TRILL hybrid ports?
A.
In this case, for each VLAN permitted by the link, only one of the two ports can become the AVF. The packets
will be dropped by the non-AVF port. As a result, the two devices cannot communicate. Avoid connecting
devices through two TRILL hybrid ports.
Q.
Why can't the ping packets received on a TRILL trunk port reach a VLAN interface?
A.
A TRILL trunk port can receive and send only TRILL-encapsulated frames. Ping packets are not encapsulated by
TRILL. As a result, they will be dropped.
Q.
Why can't the port use TRILL to encapsulate and forward the received packets on a QinQ-enabled TRILL access
port?
A.
The device does not support the operation. Avoid enabling QinQ on TRILL access ports.
Q.
Why can't an RB in a TRILL network be directly connected to common Layer 2 switches through multiple links?
A.
In this case, if some of the connecting ports have the same enabled VLAN, each of these ports considers itself
as the AVF for the VLAN. As a result, a loop occurs.
In such a network, two ports of the RB are connected. The two ports use the same source MAC address, because
TRILL frames on the same device share one source MAC address. When the RB receives a TRILL hello with its
own MAC address as the source MAC address, the RB considers the TRILL hello as one sent by itself. As a result:
•
The RB does not process the hello frame.
•
Each of the two ports considers itself as the AVF for the enabled VLAN.
Q.
Is EVB supported on a Layer 3 Ethernet interface?
A.
No.
Q.
Why can't EVB be enabled if the maximum number of ARP entries that I configured reaches the maximum
number that the system supports?
Next hop entries (16 K is supported) are required by multiple features. If ARP entries occupy the 16 K space, no
resources can be allocated for EVB S-channel creation, so EVB cannot be enabled.
Q.
Can an H3C S7500E-XS switch form an IRF fabric with devices from other switch series?
A.
No. An H3C S7500E-XS switch can form an IRF fabric only with switches from the same series.
Q.
How many member devices can an H3C S7500E-XS IRF fabric have?
A.
An H3C S7500E-XS IRF fabric can have a maximum of nine member devices.
Q.
How is an IRF master elected?
A.
An IRF fabric uses the following rules to elect a master in descending order:
1.
Current master, even if a new member has higher priority.
{
When an IRF fabric is being formed, all members consider themselves as the master, and the system
skips to rule
