Evpn Irb: Dhcpv4 And Dhcpv6 Relay - Cisco ASR 9000 Series Configuration Manuallines

EVPN IRB: DHCPv4 and DHCPv6 Relay

EVI E : 220, 222, 224, 226, 228, 230,
EVI E : 232, 234, 236, 238, 240, 242,
EVI E : 244, 246, 248, 250
Not Elected : 75
EVI NE : 101, 103, 105, 107, 109, 111
EVI NE : 113, 115, 117, 119, 121, 123,
EVI NE : 125, 127, 129, 131, 133, 135,
EVI NE : 137, 139, 141, 143, 145, 147,
EVI NE : 149, 151, 153, 155, 157, 159,
EVI NE : 161, 163, 165, 167, 169, 171,
EVI NE : 173, 175, 177, 179, 181, 183,
EVI NE : 185, 187, 189, 191, 193, 195,
EVI NE : 197, 199, 201, 203, 205, 207,
EVI NE : 209, 211, 213, 215, 217, 219,
EVI NE : 221, 223, 225, 227, 229, 231,
EVI NE : 233, 235, 237, 239, 241, 243,
EVI NE : 245, 247, 249
MAC Flushing mode : STP-TCN
Peering timer : 3 sec [not running]
Recovery timer : 30 sec [not running]
Carving timer : 0 sec [not running]
Local SHG label : 68663
Remote SHG labels : 1
68670 : nexthop 160.6.6.6
EVPN IRB: DHCPv4 and DHCPv6 Relay
EVPN IRB: DHCPv4 and DHCPv6 Relay feature provides DHCP support for the end users in EVPN
multi-homing Active-Active (MH-AA) deployment scenario. This feature enables reduction of traffic flooding,
increase in load sharing at VTEP, faster convergence during link and device failures, and simplification of
data center automation.
DHCPv4 and DHCPv6 Relay agents relay request packets, coming over the access interface, to external
DHCPv4 and DHCPv4 server to request allocation of addresses (/32) and IANA (::/128) for the end user.
DHCPv4 and DHCPv6 Relay profiles are configured on BVI interfaces which relay DHCPv4 or DHCPv4
requests from Layer 2 (L2) attachment circuit (AC) to external DHCP servers for host IPv4 addresses (/32)
and IANA (::128) IPv6 addresses.
This feature is compliant with RFC-6607.
Multi-homing Active-Active EVPN Gateways
Multi-homing Active-Active EVPN Gateways are configured with anycast IP address and MAC addresses.
ASR 9000 devices have centralized L2//Layer 3 (L3) gateway. Based on native EVPN and MAC learning,
IRB uses distributed anycast IP and anycast MAC address. Static clients are configured with anycast gateway
address as the default gateway. DHCP client sends DHCP requests for IP addresses with BVI as the gateway.
L2 access can be either single homing or multi-homing, Not all access protocols is supported with IRB. There
may or may not be L2 stretch between DC centers. Internet gateway is also included for clients to access
external network. No EVPN is configured on the Internet gateway.
EVPN IRB Route Distribution
In EVPN IRB DHCPv4 and DHCPv6, DHCP application processes and DHCP packet forwarding are
independent of EVPN IRB L2 and L3 routing. There is no subscriber routing information with the stateless
DHCP relay. But DHCP clients work similar to static clients in the EVPN core for L2 and L3 bridging and
routing. When the relay information option, relay information option vpn, relay information option
von-mode cisco and relay information option von-mode rfc commands are configured on the DHCP relay
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
612
Configure EVPN IRB