how to connect the s5720 to the cisco switch?

Created: Apr 30, 2019 07:53:10Latest reply: Apr 30, 2019 08:00:18 93 2 0 0
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the Cisco switch is enabled with PVST+, and now, we need to add a new huawei s5720 into the network, and the stp should be enabled to realize redundant links, since the cisco enabled pvst+ which is not supported by huawei switch, so I need to find a way to connect the huawei switch to cisco switch without modify the cisco switch configuration, how to do that?

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Featured Answers
chenhui
Admin Created Apr 30, 2019 07:59:56 Helpful(0) Helpful(0)

Hi!

You can enable vbst to connect the huawei swtich to the cisco switch, this could allow the two switch work together, but when Interworking Between VBST and PVST/PVST+/Rapid PVST+, here are something should pay attention to:
Interworking Between VBST and PVST/PVST+/Rapid PVST+
On a live network, a VBST-enabled device may connect to a device enabled with PVST/PVST+/Rapid PVST+.

Trunk interface

When a VBST-enabled device connects to a device enabled with Rapid PVST+, the VBST-enabled device sends standard RSTP BPDUs (or VBST BPDUs with the Data field of RSTP BPDUs) and VBST BPDUs with the Data field of RSTP BPDUs in other VLANs to exchange with the device enabled with Rapid PVST+.

When a VBST-enabled device connects to a device enabled with PVST+, the VBST-enabled device sends standard STP BPDUs (or VBST BPDUs with the Data field of STP BPDUs) and VBST BPDUs with the Data field of STP BPDUs in other VLANs to exchange with the device enabled with PVST+.

When a VBST-enabled device connects to a PVST-enabled device, packet exchange is similar to that in the scenario where a VBST-enabled device connects to a device enabled with PVST+. The difference is that the VBST-enabled device and PVST-enabled device send only VBST BPDUs with the Data field of STP BPDUs in VLAN1.

The two devices can identify the BPDUs carrying VLAN information, so a VLAN-based spanning tree is formed. The connection between a VBST-enabled device and a device enabled with PVST/PVST+/Rapid PVST+ through a trunk interface is similar to the connection between two VBST-enabled devices.

Access interface

A VBST-enabled device uses standard STP BPDUs to exchange with the device enabled with PVST/PVST+ or RSTP BPDUs to exchange with the device enabled with Rapid PVST+ according to the VLAN that the access interface belongs to. Topology calculation is performed as defined by STP/RSTP. Because STP/RSTP does not differentiate VLANs, a spanning tree shared by VLANs is formed.
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All Answers
chenhui
chenhui Admin Created Apr 30, 2019 07:59:56 Helpful(0) Helpful(0)

Hi!

You can enable vbst to connect the huawei swtich to the cisco switch, this could allow the two switch work together, but when Interworking Between VBST and PVST/PVST+/Rapid PVST+, here are something should pay attention to:
Interworking Between VBST and PVST/PVST+/Rapid PVST+
On a live network, a VBST-enabled device may connect to a device enabled with PVST/PVST+/Rapid PVST+.

Trunk interface

When a VBST-enabled device connects to a device enabled with Rapid PVST+, the VBST-enabled device sends standard RSTP BPDUs (or VBST BPDUs with the Data field of RSTP BPDUs) and VBST BPDUs with the Data field of RSTP BPDUs in other VLANs to exchange with the device enabled with Rapid PVST+.

When a VBST-enabled device connects to a device enabled with PVST+, the VBST-enabled device sends standard STP BPDUs (or VBST BPDUs with the Data field of STP BPDUs) and VBST BPDUs with the Data field of STP BPDUs in other VLANs to exchange with the device enabled with PVST+.

When a VBST-enabled device connects to a PVST-enabled device, packet exchange is similar to that in the scenario where a VBST-enabled device connects to a device enabled with PVST+. The difference is that the VBST-enabled device and PVST-enabled device send only VBST BPDUs with the Data field of STP BPDUs in VLAN1.

The two devices can identify the BPDUs carrying VLAN information, so a VLAN-based spanning tree is formed. The connection between a VBST-enabled device and a device enabled with PVST/PVST+/Rapid PVST+ through a trunk interface is similar to the connection between two VBST-enabled devices.

Access interface

A VBST-enabled device uses standard STP BPDUs to exchange with the device enabled with PVST/PVST+ or RSTP BPDUs to exchange with the device enabled with Rapid PVST+ according to the VLAN that the access interface belongs to. Topology calculation is performed as defined by STP/RSTP. Because STP/RSTP does not differentiate VLANs, a spanning tree shared by VLANs is formed.
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chenhui
chenhui Admin Created Apr 30, 2019 08:00:18 Helpful(0) Helpful(0)

Posted by chenhui at 2019-04-30 07:59 you can enable vbst to connect the huawei swtich to the cisco switch, this could allow the two switc ...
for more details, please refer to https://support.huawei.com/enterprise/docinforeader!loadDocument1.action?contentId=DOC1000166598&partNo=10142
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