The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
VTEP1# show running-config
<snip: only dhcp relevant config is shown>
ip dhcp relay information option vpn
ip dhcp relay information option
ip dhcp compatibility suboption link-selection standard
ip dhcp compatibility suboption server-override standard
ip dhcp snooping vlan 201-202
ip dhcp snooping
!
vlan configuration 200
member vni 5000
vlan configuration 201
member evpn-instance 1 vni 6000
vlan configuration 202
member evpn-instance 2 vni 7000
!
interface Loopback13
vrf forwarding green
ip address 10.1.13.13 255.255.255.0
interface Vlan200
description core svi for l3vni
vrf forwarding green
ip unnumbered Loopback0
ip pim sparse-mode
ipv6 enable
no autostate
interface Vlan201
vrf forwarding green
ip dhcp relay information option vpn-id
ip dhcp relay source-interface Loopback13
ip address 192.168.1.201 255.255.255.0
ip helper-address 192.168.3.100
interface Vlan202
vrf forwarding green
ip dhcp relay information option vpn-id
ip dhcp relay source-interface Loopback13
ip address 192.168.2.201 255.255.255.0
ip helper-address 192.168.3.100
interface nve10
no ip address
source-interface Loopback0
host-reachability protocol bgp
member vni 7000 mcast-group 231.1.1.1
member vni 6000 mcast-group 231.1.1.1
member vni 5000 vrf green
Border_VTEP# show running-config
<snip: only dhcp relevant config is shown>
ip dhcp relay information option vpn
ip dhcp relay information option
ip dhcp relay override giaddr link-selection
ip dhcp compatibility suboption server-override standard
ip dhcp snooping vlan 201-202
ip dhcp snooping
!
vlan configuration 200
member vni 5000
vlan configuration 201
member evpn-instance 1 vni 6000
vlan configuration 202
member evpn-instance 2 vni 7000
!
interface Loopback14
vrf forwarding green
ip address 10.1.14.14 255.255.255.0
interface Vlan200
description core svi for l3vni
vrf forwarding green
ip unnumbered Loopback0
ip pim sparse-mode
ipv6 enable
no autostate
interface Vlan201
vrf forwarding green
ip dhcp relay information option vpn-id
ip dhcp relay source-interface Loopback14
ip address 192.168.1.201 255.255.255.0
ip helper-address 192.168.3.100
interface Vlan202
vrf forwarding green
ip dhcp relay information option vpn-id
ip dhcp relay source-interface Loopback14
ip address 192.168.2.201 255.255.255.0
ip helper-address 192.168.3.100
interface nve10
no ip address
source-interface Loopback0
host-reachability protocol bgp
member vni 7000 mcast-group 231.1.1.1
member vni 6000 mcast-group 231.1.1.1
member vni 5000 vrf green
interface Vlan203
vrf forwarding green
ip address 192.168.3.203 255.255.255.0
ipv6 address 2001:203::203/64
ipv6 enable
end
interface GigabitEthernet1/0/30
description connected to DHCP server
switchport access vlan 203
switchport mode access
次に、両方の VTEP からの DHCP サーバの到達可能性を確認するための VTEP 1 とボーダー VTEP での show ip route vrf コマンドの出力例を示します。
VTEP 1
次に、VTEP 1 での show ip route vrf コマンドの出力例を示します。
VTEP1# show ip route vrf green 192.168.3.100
Routing Table: green
Routing entry for 192.168.3.0/24
Known via "bgp 10", distance 200, metric 0, type internal
Last update from 10.2.2.20 on Vlan200, 18:28:43 ago
Routing Descriptor Blocks:
* 10.2.2.20 (default), from 10.5.5.50, 18:28:43 ago, via Vlan200
opaque_ptr 0x7FEEA41D09C8
Route metric is 0, traffic share count is 1
AS Hops 0
MPLS label: none
MPLS Flags: NSF
ボーダー VTEP
次に、VTEP 2 での show ip route vrf コマンドの出力例を示します。
Border_VTEP# show ip route vrf green 192.168.3.100
Routing Table: green
Routing entry for 192.168.3.0/24
Known via "connected", distance 0, metric 0 (connected, via interface)
Redistributing via bgp 10
Advertised by bgp 10
Routing Descriptor Blocks:
* directly connected, via Vlan203
Route metric is 0, traffic share count is 1
スパインスイッチのパケットキャプチャ
次に、上記で設定したトポロジのスパインスイッチのパケットキャプチャの詳細情報の例を示します。
6 12.749326 10.1.13.13 b^F^R 192.168.3.100 DHCP 449 DHCP Discover - Transaction ID 0x228f
7 12.750463 192.168.3.100 b^F^R 10.1.13.13 DHCP 447 DHCP Offer - Transaction ID 0x228f
8 12.755776 10.1.13.13 b^F^R 192.168.3.100 DHCP 467 DHCP Request - Transaction ID 0x228f
9 12.756701 192.168.3.100 b^F^R 10.1.13.13 DHCP 447 DHCP ACK - Transaction ID 0x228f
11 12.803031 00:59:dc:50:ae:42 b^F^R ff:ff:ff:ff:ff:ff ARP 110 Gratuitous ARP for 192.168.2.3 (Reply)
14 15.760480 00:59:dc:50:ae:42 b^F^R ff:ff:ff:ff:ff:ff ARP 110 Who has 192.168.2.201? Tell 192.168.2.3
15 15.761058 38:0e:4d:9b:6a:42 b^F^R 00:59:dc:50:ae:42 ARP 110 192.168.2.201 is at 38:0e:4d:9b:6a:42
VTEP 1 のパケット詳細の検出
次に、上記で設定したトポロジによる VTEP 1 のパケット検出の詳細の例を示します。
Frame 6: 449 bytes on wire (3592 bits), 449 bytes captured (3592 bits) on interface 0
Interface id: 0 (/tmp/epc_ws/wif_to_ts_pipe)
Interface name: /tmp/epc_ws/wif_to_ts_pipe
Encapsulation type: Ethernet (1)
Arrival Time: Mar 28, 2020 09:03:26.742700000 UTC
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1585386206.742700000 seconds
[Time delta from previous captured frame: 7.090744000 seconds]
[Time delta from previous displayed frame: 7.090744000 seconds]
[Time since reference or first frame: 12.749326000 seconds]
Frame Number: 6
Frame Length: 449 bytes (3592 bits)
Capture Length: 449 bytes (3592 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:udp:vxlan:eth:ethertype:ip:udp:bootp]
Ethernet II, Src: 00:a3:d1:5a:03:61 (00:a3:d1:5a:03:61), Dst: 38:0e:4d:9b:6a:45 (38:0e:4d:9b:6a:45)
Destination: 38:0e:4d:9b:6a:45 (38:0e:4d:9b:6a:45)
Address: 38:0e:4d:9b:6a:45 (38:0e:4d:9b:6a:45)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: 00:a3:d1:5a:03:61 (00:a3:d1:5a:03:61)
Address: 00:a3:d1:5a:03:61 (00:a3:d1:5a:03:61)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 10.1.1.10, Dst: 10.2.2.20
0100 .... = Version: 4
.... 0101 = Header Length: 20 bytes (5)
Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
Total Length: 435
Identification: 0xc29c (49820)
Flags: 0x4000, Don't fragment
0... .... .... .... = Reserved bit: Not set
.1.. .... .... .... = Don't fragment: Set
..0. .... .... .... = More fragments: Not set
...0 0000 0000 0000 = Fragment offset: 0
Time to live: 253
Protocol: UDP (17)
Header checksum: 0xa27c [validation disabled]
[Header checksum status: Unverified]
Source: 10.1.1.10
Destination: 10.2.2.20
User Datagram Protocol, Src Port: 65294, Dst Port: 4789
Source Port: 65294
Destination Port: 4789
Length: 415
[Checksum: [missing]]
[Checksum Status: Not present]
[Stream index: 0]
Virtual eXtensible Local Area Network
Flags: 0x0800, VXLAN Network ID (VNI)
0... .... .... .... = GBP Extension: Not defined
.... .... .0.. .... = Don't Learn: False
.... 1... .... .... = VXLAN Network ID (VNI): True
.... .... .... 0... = Policy Applied: False
.000 .000 0.00 .000 = Reserved(R): 0x0000
Group Policy ID: 0
VXLAN Network Identifier (VNI): 5000
Reserved: 0
Ethernet II, Src: a0:f8:49:10:00:00 (a0:f8:49:10:00:00), Dst: 38:0e:4d:9b:6a:4a (38:0e:4d:9b:6a:4a)
Destination: 38:0e:4d:9b:6a:4a (38:0e:4d:9b:6a:4a)
Address: 38:0e:4d:9b:6a:4a (38:0e:4d:9b:6a:4a)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: a0:f8:49:10:00:00 (a0:f8:49:10:00:00)
Address: a0:f8:49:10:00:00 (a0:f8:49:10:00:00)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 10.1.13.13, Dst: 192.168.3.100
0100 .... = Version: 4
.... 0101 = Header Length: 20 bytes (5)
Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
Total Length: 385
Identification: 0x083f (2111)
Flags: 0x0000
0... .... .... .... = Reserved bit: Not set
.0.. .... .... .... = Don't fragment: Not set
..0. .... .... .... = More fragments: Not set
...0 0000 0000 0000 = Fragment offset: 0
Time to live: 254
Protocol: UDP (17)
Header checksum: 0xd812 [validation disabled]
[Header checksum status: Unverified]
Source: 10.1.13.13
Destination: 192.168.3.100
User Datagram Protocol, Src Port: 67, Dst Port: 67
Source Port: 67
Destination Port: 67
Length: 365
Checksum: 0x26ca [unverified]
[Checksum Status: Unverified]
[Stream index: 2]
Bootstrap Protocol (Discover)
Message type: Boot Request (1)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 1
Transaction ID: 0x0000228f
Seconds elapsed: 0
Bootp flags: 0x8000, Broadcast flag (Broadcast)
1... .... .... .... = Broadcast flag: Broadcast
.000 0000 0000 0000 = Reserved flags: 0x0000
Client IP address: 0.0.0.0
Your (client) IP address: 0.0.0.0
Next server IP address: 0.0.0.0
Relay agent IP address: 10.1.13.13
Client MAC address: 00:59:dc:50:ae:42 (00:59:dc:50:ae:42)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type (Discover)
Length: 1
DHCP: Discover (1)
Option: (57) Maximum DHCP Message Size
Length: 2
Maximum DHCP Message Size: 1152
Option: (61) Client identifier
Length: 27
Type: 0
Client Identifier: cisco-0059.dc50.ae42-Vl202
Option: (12) Host Name
Length: 12
Host Name: host-switch1
Option: (55) Parameter Request List
Length: 8
Parameter Request List Item: (1) Subnet Mask
Parameter Request List Item: (6) Domain Name Server
Parameter Request List Item: (15) Domain Name
Parameter Request List Item: (44) NetBIOS over TCP/IP Name Server
Parameter Request List Item: (3) Router
Parameter Request List Item: (33) Static Route
Parameter Request List Item: (150) TFTP Server Address
Parameter Request List Item: (43) Vendor-Specific Information
Option: (60) Vendor class identifier
Length: 8
Vendor class identifier: ciscopnp
Option: (82) Agent Information Option
Length: 44
Option 82 Suboption: (1) Agent Circuit ID
Length: 12
Agent Circuit ID: 010a000800001b5801010000
Option 82 Suboption: (2) Agent Remote ID
Length: 8
Agent Remote ID: 0006a0f84910bc80
Option 82 Suboption: (151) VRF name/VPN ID
Length: 6
VRF name:
Option 82 Suboption: (5) Link selection
Length: 4
Link selection: 192.168.2.0
Option 82 Suboption: (11) Server ID Override
Length: 4
Server ID Override: 192.168.2.201
Option: (255) End
Option End: 255