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WS-C3850-24T Vlan接口MAC怪怪的

AlanTang
Level 1
Level 1


请问一下,我的是WS-C3850-24T 16.3.7 现在发现Vlan接口地址的部份MAC相同,你们有没有这个问题如图131137i26ux0mkvmbb9xv6.jpg.thumb.jpg

4 条回复4

我认为这是3850的Bug,你的这个问题,可能和如下bug有关系。
cat3850 have same mac add for SVI2 and SVI13
CSCvf90710
Description
Symptom:
Have same mac address in svi2 and svi13. It makes packet forwarding mess up in some special layer 2 senario.
Switch#sh int vlan 2
Hardware is Ethernet SVI, address is 0041.d248.d9f7 (bia 0041.d248.d9f7)
Switch#sh int vlan 13
Hardware is Ethernet SVI, address is 0041.d248.d9f7 (bia 0041.d248.d9f7)
Conditions:
None
Workaround:
Not use vlan13 or vlan2 in same time.
Further Problem Description:
None
--------------------------------
如上信息,参考一下吧。这个问题应该不会通过软件版本去修复。
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Rps-Cheers | If it solves your problem, please mark as answer. Thanks !

Terence.Jh
Spotlight
Spotlight
1540488497lcj 发表于 2019-4-26 21:22
我认为这是3850的Bug,你的这个问题,可能和如下bug有关系。
cat3850 have same mac add for SVI2 and SVI ...

maybe you should understand what a so-called three-layer switch is。。。。。。;P

Terence.Jh
Spotlight
Spotlight
terence 发表于 2019-4-27 15:09
maybe you should understand what a so-called three-layer switch is。。。。。。

"By default, Catalyst switches come with the same MAC address configured on all interfaces. The diagram in this section shows a Catalyst 6500 with Supervisor Engine 2 and MSFC2. However, the MAC address on all three VLAN interfaces is the same, even though the IP addresses are different.
Catalyst switches have varied support for the ability to change the MAC address for a VLAN (SVI) or L3 interface. You do not need to change the burned-in MAC address if the network devices support multiple IPs to a single MAC Address Resolution Protocol (ARP) table, which is common. Also, you do not need to change the MAC address if the switches support a per-VLAN MAC address table. Cisco switches support a per-VLAN MAC address table or content-addressable memory (CAM) table. This support allows the switches to maintain a MAC address table per VLAN. Therefore, the switches can have the same MAC address on multiple VLAN interfaces without issue."

terence 发表于 2019-4-27 15:12
"By default, Catalyst switches come with the same MAC address configured on all interfaces. The di ...

wow,you are so cool !
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Rps-Cheers | If it solves your problem, please mark as answer. Thanks !
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